Introducción

Únete a nosotros para vivir el sueño del viajero en el tiempo: la visión profunda, lúcida, Orwellian de esperanza, miedo y nostalgia, que es 1984. Solo A tiempo para su 30 aniversario, pusimos manos a la obra en un original '84: la Macintosh 128K. Y, lo has adivinado, lo estamos derribando como si fuera el Muro de Berlín.

La explosión de hoy del pasado se presenta con una ayuda increíble de Cult of Mac y The Vintage Mac Museum. Cult of Mac nos hará notar que no se dañó ningún Macinti de época en la elaboración de esta guía. Nuestro 128K ya había pasado más allá del velo antes de su noble sacrificio.

Enciende los condensadores de flujo y encuentra nuestro Facebook, sigue nuestro oportuno Tweets y obten una dosis de nostalgia de nuestro filtro Instagram.

¿Quieres algunos fondos de pantalla dulces de Mac 128K? ¡Consigue algunos!

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Este desmontaje no es una guía de reparación. Para reparar tu Macintosh 128K, utiliza nuestros manuales de servicio .

  1. La Mac original se vendió por $ 2,495, que es de $ 5,594.11 en dólares de hoy. Entonces, ¿qué obtuviste por toda esa moneda?
    • La Mac original se vendió por $ 2,495, que es de $ 5,594.11 en dólares de hoy. Entonces, ¿qué obtuviste por toda esa moneda?

      • Procesador Motorola 68000 de 8 MHz

      • DRAM 128 KB

      • Pantalla CRT en blanco y negro de 9 "que funciona a 512 x 342 (72 ppp)

      • 400 KB de almacenamiento total a través de una unidad de disquete de 3,5 pulgadas de un solo lado

      • Ratón de un solo botón y teclado robusto

    • A pesar de la inflación, estetesoro de los años 80no nos costó ni un centavo. ¡Muchas gracias a nuestros amigos en el Vintage Mac Museum por prestarnos este Mac y a Cult of Mac por inyectar un poco de sabor de los 80 en el derribo!

    The mac could support more than 2 colors (grey for example)

    Lucas Hoekstra (Lucas9810) - Contestar

  2. Antes de abrir esta cápsula de tiempo (no, no estas cápsulas de tiempo), tomemos un momento para ver hasta dónde hemos llegado en tres décadas.
    • Antes de abrir esta cápsula de tiempo (no, no estas cápsulas de tiempo), tomemos un momento para ver hasta dónde hemos llegado en tres décadas.

    • En primer lugar, muestra. Mac 128K de 1984 incluyó un CRT de 9 "con resolución de 512 x 342 y soporte para dos colores: negro y blanco. A la derecha, nuestra encantadora comparación A finales de 2013, iMac tiene una pantalla de 21.5" 1920 x 1080 píxeles con millones de colores.

    • Ah, y el iPhone original tenía una pantalla de 480 × 320 píxeles a 163 ppp.

    • Mientras Apple trabaja para popularizar Thunderbolt, una interfaz IO de 20 Gb / s, reflexionemos sobre el puerto serial de alta velocidad, con velocidades deportivas que se miden en miles de bps, en lugar de miles de millones.

    • Pero bueno, al menos el enchufe de CA es el mismo.

    Not true -- the serial port was RS-422, supporting much faster speeds

    Joel Finkle - Contestar

    RS-422 was introduced with the Macintosh Plus. It was not on the Mac 128 or Mac 512.

    Tom Schmidt - Contestar

    Incorrect - RS422 was there from the beginning - perhaps you are thinking of the DIN-style ports, which did indeed come in with the Mac Plus.

    JohnC -

    No, JohnC is correct.

    MCA -

    You're typing: "The quick brown fox jumps over the lazy dog"

    Chris Reites - Contestar

    As a 128K Mac owner from 1984, I can confirm that it had two 9-pin RS422 ports from the very beginning.

    Ted T - Contestar

    I pulled the storage box containing my old documentation for the Mac 128K and Mac 512k, and they confirm that the serial ports were RS422. The Mac 128k in the garage also with the keyboard, now if I can just find the mouse...

    John - Contestar

    Hey, you forgot to include discharging the high voltage cap!

    Fred Torres - Contestar

    My neighbor Fred, of Fred's Retort, took apart my 128 to upgrade it to 512K! With an external floppy disk, I was in Hog Heaven!

    Dave - Contestar

    What? No case cracker or CRT discharge tool? Those were essential tools for cracking open a classic Mac back in the day. Especially the discharge tool, used to prevent you from finding out why they call the black box at the end of the anode lead to the CRT a 'flyback' transformer.

    http://www.pcmag.com/encyclopedia/term/3...

    johnhutchens - Contestar

    That power supply board wasn't the same design as the first 128k Mac boards. the first design had a tin shield on the entire inside edge of the power supply board to keep the board from flexing. The first design flyback transformers were about 1/2 the size as the one in the picture. I have soldered probably 1000 Mac 128,512 and Plus power supply boards after replacing the flyback transformer and all of the caps as the ones Apple used were not long life rated and failed frequently in the early macs

    derwurst - Contestar

    The RS-422 chip had support for two ports, and would also drive RS-232 (which is unbalanced, whereas RS-422 is balanced). But Apple "stole" one of the control signals, making it a bit hard to work with standard modems of the day. You needed a hacked cable that worked around the issue (the missing one was RTS/CTS, I think).

    And what was the missing signal used for? Why, that was where the mouse signal went - one port had the X-axis, the other one had the Y-axis. These were hardware interrupts so mouse tracking was very good.

    vpndev - Contestar

    • Treinta años de progreso producen algunos cambios impresionantes en los periféricos de entrada. Los teclados y ratones ahora son inalámbricos, más delgados y están compuestos principalmente de metal resistente, no amarillo.

    • Y ahora tenemos teclas de flecha! En la forma típica de Apple, abandonaron las flechas de la Mac original para obligar a las personas a usar el mouse, unaccesorio nuevo y extraño en ese momento.

      • Cult of Mac agrega: Esta racha de tendencias continuó. Apple desechó los puertos SCSI y serie con el lanzamiento del primer iMac en 1998, lo que aceleró la aceptación de USB. Plus ça change, plus c'est pareil.

    • Aquí hay una comparación lado a lado de un periférico de comando de voz con un solo botón y un dispositivo de entrada inalámbrico basado en magia, capaz de gestos.

      • De acuerdo, técnicamente esa caja es un Apple Mouse II, número de modelo M0100. Utiliza un conector serie D-subminiatura (DE-9 para ser exactos). El huevo de Spacey es un Magic Mouse.

    The yellow is because of UV rays reacting with bromide-based flame retardants added to the plastic. Until 87, Macs and peripherals were a putty color.

    Jerri Kohl - Contestar

    • Ahora que es un número de modelo: Macintosh Modelo M0001. (Apple incorporó solo un poco de espacio para futuros modelos).

    • Estas primeras etiquetas son noticias tristes: incluso en los días más jóvenes y salvajes de Apple, no querían que la gente atendiera sus propios dispositivos.

    • Esa etiqueta de la FCC significa negocio: si vas a jugar con tu Mac, corres el riesgo de interferencias de radio locales. (Suponemos que Pandora no era una alternativa viable en 1984.)

    Back in the day, "No user-serviceable parts inside" was a warning to older people that this was not a vacuum-tube device, and if it stopped working, you couldn't simply pop it open, pull the tube, and take it down to the drugstore's tube tester.

    Mark - Contestar

    Made in USA, now those were the days!

    Clayton Fraga - Contestar

    During POST it would sit there with a totally gray screen.....

    But the mouse cursor still worked beautifully.

    No driver...no OS loaded...the mouse just worked.

    cns - Contestar

    I just bought one with the same problem. I intend to come back and tell you how I fixed it.

    Jerri Kohl -

    • No hace ninguna diferencia en nuestro kit de herramientas Pro Tech cuando se fabricó esta Mac, ya que contiene todas las herramientas que necesita para las reparaciones de ayer, hoy y mañana.

    • Nuestra extensión flexible adquiere los tornillos T15 profundamente empotrados en la caja.

    • Fiel a la forma, Apple escondió un tornillo; Esta vez, está debajo de la puerta de la batería del reloj. No hay problema para nosotros, está fuera y estamos metiéndonos en la historia.

    • Cult of Mac agrega: Afortunadamente, estos primeros Mac no estaban pegados juntos, e incluso tenían una batería reemplazable por el usuario.

    Simply backing out the 2 recessed screws about half way and then pinging the handle of the driver is the easiest way to "crack" the case open

    egrau - Contestar

    By the time the Mac Plus came out with user-replaceable SIMMs, vendors like TechWorks were bundling the a cheap Torx T15 wrench with your RAM. Also, anybody remember Larry Pina's Macintosh Repair & Upgrade Secrets? Man, I had to resolder plenty of cold solder joints on analog boards. Such a great feeling getting those machines running again.

    Darryl - Contestar

    A couple of things I remember: If you went to Home Depot, you could find a clamp with a thin plate ends that would fit in the groove around the back case, and all you had to do was squeeze the clamp (i.e. open the clamp) and glide it around the groove until the case popped open. Much easier than trying to use a spudger (or, like many of us, marring the case with a screwdriver). On the analog board, the 4 pin molex plug was the frequent overheating spot. It drove the high voltage into the CRT and the heat would melt the solder and subsequent cooling would cause a cold solder joint, which meant your video would go in and out, and whacking it on the side sometimes restored it.

    owen - Contestar

    One point to remember when disassembling a compact Mac: If you've installed the "Reset/programmer's buttons" over the vents at the bottom side back corner, you should pop them out before removing the case back. Otherwise, they'd tend to snag on the motherboard back plate. The buttons provided a way to reset the Mac without having to turn it off. There was also a NMI (non-maskable interrupt) button that could be useful for programmers (like a hardware ctrl-C to break into a hung program).

    cityzen - Contestar

    • Entregamos y abrimos la bóveda; Sólo estamos un poco decepcionados por la falta deefectos cool de sonido neumáticos .

    • La máquina entera se desliza fuera de la caja posterior, revelando la fuente de alimentación, la pantalla CRT, la unidad de disquete de 3,5 pulgadas y, escondida debajo de todo, la placa lógica.

    • Moldeadas en el interior de la carcasa de plástico posterior hay runas de tecnología que superan los autógrafos de Steven Jobs, Woz, Bill Atkinson, Andy Hertzfeld, Bruce Horn, Jef Raskin y el resto del equipo histórico.

    • Cult of Mac agrega: los artistas reales firman su trabajo.

    We included an upholstered desk chair in our teardown/upgrade tools for classic Macs: at least the first time you cracked the case of one. Take out the screws, hold the Mac screen down over the chair, and shake. You could also buy a special Mac cracking tool that looked like a cross between a pair of pliers and a door hinge.

    Matt Mitchell - Contestar

    Try find out and recognize all the names. :) All those who signed here are pioneers of personal computing and deserves some special remembering.

    xcvista - Contestar

  3. Reparte el espíritu de reparación esta Navidad
    Obtén $12 de descuento en tu compra de $50 o más con el código FIXMAS12
    Reparte el espíritu de reparación esta Navidad
    Obtén $12 de descuento en tu compra de $50 o más con el código FIXMAS12
    • Ahora que estamos en terreno de servicio autorizado solo para personal, encontramos algunos potenciómetros de calibración para ajustar la pantalla.

    • Los CRT de Ye olde eran una bolsa mixta para fines de reparación: más fáciles de acceder que las pantallas planas ajustadas de hoy en día, pero sí eran peligrosas si se manipulaban mal. Esas advertencias de alto voltaje no son una broma.

    • Presente, conozca su pasado, cara a cara. Y si ambos están aquí en 30 años, tal vez se encuentren con el futuro.

    Agregar Comentario

    • Entre el CRT y los condensadores, desconectar esta fuente de alimentación es como desarmar una bomba.

    • Apple hizo todo lo posible para mantener a los usuarios promedio fuera de la Macintosh, usando tornillos Torx en el exterior. Pero una vez que estás dentro, es una mezcla divertida de tipos de tornillos, incluidos Phillips y de cabeza plana.

    • Es hora de sacar nuestro rollo favorito de controladores de manija fija, el juego de destornilladores Pro Tech.

    • Cult of Mac agrega: ¡Todavía preferiríamos desarmar un 128K Mac que un iMac cualquier día!

    Hey!!! You have to discharge the CRT! 1,500 Volts!!!. This is a big deal!

    Also, after discharging the CRT, you want to pull the CRT socket cable (That white disc) off of the CRT because if you bump it, you'll snap off a bit of glass on the end of the CRT and that will be all for that CRT.

    scottrlindsey - Contestar

    I can attest to this. I snapped that bit of glass off a Mac Plus while the customer was waiting for a RAM upgradge. Doh.

    Kevin Becker - Contestar

    • Al ritmo de Misión Imposible, eliminamos la fuente de alimentación de forma rápida y segura. No hay escritores técnicos electrocutados ... hoy.

    • Esta fuente de alimentación de 60 vatios es el número de parte de Apple 630-0102.

      • Creemos que la potencia máxima de 60 vatios es impresionante para una computadora completa y una pantalla CRT.

    • Nuestra comparación iMac presenta una fuente de alimentación de 186 vatios, que se ajusta a una placa de circuito considerablemente más pequeña que la de los 128K.

    The board on the right is more than just the power supply: it's called the "Analog Board" and includes a fair amount of the video circuitry (don't remember if there's any audio stuff on there)

    Joel Finkle - Contestar

    That's not just the power supply -- it's the high voltage, deflection, and video drive circuitry for the CRT.

    (...and audio amp, and speaker...)

    Mark Spaeth - Contestar

    The good news is that if you could take a battery from one of Apple's newer laptops (say, perhaps the last Macbook with a user-replaceable battery), wire it to the Macintosh, and get as much battery life as the laptop. Or perhaps much more since you couldn't actually use the old computer for much.

    JM Palacios - Contestar

    I have the common components (mostly caps) and a flyback tranformer, repair kit for a mac plus analog board still on hand. Use to repair these all the time.

    egrau - Contestar

    It's probably a good place to point out that the 128, 512, and Plus all shipped with no fans. All part of Steve Job's obsession with silent machines no matter how it harmed the hardware. There were many ways available to get Fans into the case. Kensington had a device that slid into the handle that was both power supply and case fan. Some of the various interior upgrade cards came with little internal case fans.

    Jenevieve DeFer - Contestar

    • Y el premio al avance tecnológico más notable se otorga a: Pantallas de Mac. Este enorme CRT antiguo está muy lejos de los gráficos que ofrecen las pantallas Retina ultrafinas de hoy.

    • Abultados, pesados y llenos de plomo, estas pistolas de electrones de la vieja escuela en tubos de vacío y sus bobinas de desviación causaron furor en los años 80. ¡Totalmente tubular!

    • Cult of Mac agrega: La pantalla original de Macintosh era solo de 1 bit en blanco y negro, pero marcó el comienzo de la era revolucionaria de los gráficos y autoedición WYSIWYG (Lo que ves es lo que obtienes).

    Agregar Comentario

    • Incluso hace 30 años, a Apple le gustaban los envases ordenados. Con solo un poco de persuasión, la placa lógica se desliza fuera de su bandeja.

    • No hay enfriamiento activo en este papá Mac. El Motorola 68000 tiene un poco de espacio para respirar, pero nada más.

    • Cult of Mac agrega: El 68k también impulsó a Lisa, la antecesora de Apple del Macintosh.

    Don't forget, the m68k was in the first Palm PDAs! (For roughly a good decade, too!)

    Donald Kirker - Contestar

    Been awhile since I checked the specs, but I'm pretty sure my TI-89 has more RAM and power than this Mac!

    JM Palacios - Contestar

    You wrote, "Even 30 years ago, Apple had a thing for tidy packaging." While that's true, Apple's tidy packaging dates back at least to the Apple II. It had a compact (for its day) switching power supply, the motherboard layout was super clean (the Apple I mobo also had a neat layout), and don't forget the sleek plastic case.

    John M - Contestar

    • IC notables en la placa lógica Mac 128K:

      • Microprocesador Motorola MC68000G8

      • Fairchild Semiconductor 74LS393 Video Counter

      • Micron 4264 64 kb RAM (64 kb x 16 chips = 1024 kb, o 128 KB)

        • El mismo nombre para el 128K fue esta matriz de RAM no actualizable. Anticipando que los clientes querrían más poder, los ingenieros de Apple diseñaron en secreto la placa lógica para facilitar la fabricación de una versión de 512 KB, que se lanzó solo nueve meses después.

      • Simtek C19728 y C19729 32 KB ROM (32 KB x 2 IC = 64 KB)

      • Simtek 344-0041-A "Integrated Woz Machine" Controlador de disco

      • Controlador de comunicaciones serie Zilog Z8530PS

    In fact, hobbyists and renegade repair shops would field-upgrade 128K machines to 512K by piggybacking additional RAM atop the existing chips.

    Joel Finkle - Contestar

    Yup! A friend of mine (a former Cray field tech!) did that to my 128, giving me a cheap double-your-RAM upgrade!

    Dmitri Fetisov - Contestar

    I had a floor model which I believe was first week's production. In Jan 1985, a RAM upgrade cost ~$750 but by December, that had fallen to $75--if you wanted to solder it in yourself. I got mine from MacMemory--and I got a long Torx screwdriver from them also. I snipped off the old ram and sucked out the old solder. I had the option of soldering in chip holders or soldering the RAM in directly, and I chose to do it directly--it had to be fast and precise because the circuit board was four layers thick and you couldn't overheat the chips. You have no idea what a wonderful feeling it was when I turned it on, a smiley face appeared and it went dong!

    Clyde Kahrl - Contestar

    What the article doesn't say is who the secret of upgradablity of the MAC motherboard was for (who they had to keep it secret from), Steve Jobs. He forbade them from making the motherboard upgradable. They had the last laugh though. The row of platethroughs next to the processor can have a small board soldered into it with one IC on it. A 74S158 if I remember. You could then unsolder the 64K chips and put in 256k chips. I remember doing this to a hackintosh I made way back in 1986.

    This lack of upgradablity/reparablity pervaded almost everything Jobs built. I think he was offended by the idea that anyone would want expand (this would mean they were not adequate) or alter his perfect creations.

    Walter Peterson - Contestar

    Re: Mac 512K upgrades. At the time I worked for a semiconductor manufacturer so getting the necessary 74S157 and 16 ea 256Kx1 DRAMs was fairly easy. Finding the correct Torx driver was the bigger challenge.

    Friends would bring their 128K Macs over and in two hours had a 512K Mac ... and I had $200 in my pocket. Big money back in 1984!

    Phil Wood - Contestar

    I didn't own a mac 128 but I did have a couple of Macintosh Plus machines. When I opened one up, I was driven to ask why it was called "Plus" rather than "Minus." Because it was minus a disk controller, minus video hardware, minus anything but the simplest audio hardware, minus any kind of expansion bus other than SCSI. All this "hardware" was actually emlulated in software at boot time by the CPU.

    While this is quite a tribute to the abilities of the 68000 processor, the task of creating and maintaining all this phantom hardware meant there wasn't much left for actually doing work.

    I had to wonder why this machine cost so much when it had so little inside it. This, together with the intentional lack of upgradeability, epitomises the Jobs world view which influenced everything Apple did, even up to today. The amazing thing to me is that so many people seem to be ok with this.

    freddyzdead - Contestar

    Not marked as "notable", but very important are the 6 HAL (Hardcoded Array Logic) chips, at D1, D2, D3, E1, E2 and E14. IIRC it was the first time these chips were used in a desktop computer; they were responsible for coordinating all the CPU, RAM, ROM and peripheral timing and decoding, and for potential cloners they were harder to reverse-engineer than standard TTLs.

    rainer - Contestar

    • ¿Qué tenemos aquí? ¿Una imprenta de Sony…? ¿Cepilladora? ¿Turbo Encabulator?

    • Sabemos que adivinaste bien; es un disquete de 3.5 pulgadas que lleva nuevamente a la nueva tecnología, dejando las antiguas unidades de 5.25 pulgadas en el pasado.

    • Cult of Mac agrega: La Macintosh casi se distribuye con la misma unidad de disquete "Twiggy" de 5.25 pulgadas que usaba Lisa, pero la unidad de 3.5 pulgadas de Sony obtuvo su trabajo de una manera bastante entretenida.

    And a box of 10 of these retailed for $50, if you could even find them in the early days.

    Joel Finkle - Contestar

    They were extremely expensive. Fortunately, HP were using the same drives in some of their systems. I was able to persuade a friend who worked at HP the buy a case of floppy disks (10 boxes, each box containing 10 floppies) at the employee discount price of only $290.

    John -

    You can actually see that the opening in the front of the metal frame, through which the little 3.5" drive pokes, is designed for the full width 5.25" Twiggy floppy mechanism. Strangely this extra wide opening in the frame survived several original Mac redesigns, and was present in the SE series, and the Classic series of compact Macs for almost 10 years.

    MinerAl - Contestar

  4. The quick brown fox jumps over the lazy dog.

    vwlou89 - Contestar

    You got it! Congrats, vwlou89, we'll get your prize out to you ASAP :D

    Andrew Optimus Goldberg -

    The Quick Brown Fox Jumps Over the Lazy Dog

    Ben Chernicoff - Contestar

    Jackdaws love my big sphinx of quartz!

    Dmitri Fetisov - Contestar

    In the video you guys are typing: the quick brown fox jumps over the lazy dog

    dave - Contestar

    Thank you for the video and Audio. Music to my ears!

    chuckmcmillen - Contestar

    Does anyone have an extra keyboard cable or could you lend me yours, so I can scan it and make a 3D copy of the jacks. I need to get my old Mac up and running again (@vassko)

    Vassil Mladjov - Contestar

    I have a good supply of brand new Mac 128K-Plus keyboard cables. But they are Platinum in color, for the later version of the Plus model.

    Raymond Flowers -

    You can crimp your own; just crimp one of the standard RJ9 connectors upside down from the other, producing a "straight through" cable.

    Tom Spindler -

  5. The keyboard key-switches were not that hard. Apple Service taught key switch replacement as part of Apple //e certification.

    chuckmcmillen - Contestar

    • ¡Ahora para un poco de disección del ratón! No se preocupe, esto será mucho más humano que lo que sucedió en laclase de biología de la escuela secundaria.

    • Lanzamos la bola del ojo con un giro rápido.

    • Abierto, encontramos muchas vísceras de plástico, dos codificadores en cuadratura y algunas resistencias. Sorprendentemente, eso es todo lo que encontramos.

    • Este diseño simplificado redujo los costos y mejoró la confiabilidad al mover los complejos circuitos del mouse hacia el escritorio, allanando el camino para ratones de escritorio baratos en los próximos años.

    Agregar Comentario

    • Macintosh 128K Puntaje de reparabilidad 7 de 10 (10 es el más fácil de reparar).

    • Una vez dentro, es sencillo y sencillo reemplazar cualquiera de los componentes principales: unidad de disquete, fuente de alimentación, placa lógica o pantalla CRT.

    • Sin adhesivo en ninguna parte.

    • Batería de reloj reemplazable por el usuario.

    • Capacidad de actualización limitada: la memoria RAM está soldada a la placa lógica y no se puede reemplazar, y no hay una ranura / puerto para agregar una unidad interna. Sin embargo, puede expandir el almacenamiento a través de una unidad de disquete externa opcional.

    • El estuche es bastante difícil de abrir, con tornillos profundamente empotrados y un ajuste apretado del panel.

    • Hay un alto voltaje peligroso tanto en la fuente de alimentación como en el CRT que hacen que la reparación sea potencialmente peligrosa.

    A third party offered a hard drive that mounted internally, using a clip atop the CPU.

    Joel Finkle - Contestar

    You're thinking of the SCSI interface upgrade. It clipped over the CPU and a ribbon cable was snaked out through the battery door. As far as installing an internal drive, you had to remember that it would be a while before 3.5" HDs would even be available, and that they were initially the same height as 5.25" 1/2-height drives (full height being about 3.25").

    cityzen -

    Ah, the Hyperdrive: http://www.flickr.com/search/?q=hyperdri...

    I was thinking of something like the Dove MacSnap: http://www.vintagemacworld.com/macsnap.h...

    The Hyperdrive was pretty rare & expensive, whereas upgrade kits like the MacSnap eventually became cheap & common.

    cityzen -

    You are thinking of the Hyperdrive. That pre-dated SCSI by quite some time.

    dave - Contestar

    There was the Paradise hard drive that tried to match the Design of the mac and was connected to the serial port. Needed a boot disk to activate and was a bit slower than the disk drive, but had 10 MB! (at least mine has - there was a 20MB version too)

    ReiZu - Contestar

    The RAM 'could' be replaced. I know, because I can remember upgrading my 128k machine to 512k on my kitchen table. I wouldn't recommend anyone try it because it's a lot of chips to unsolder.

    john - Contestar

    Back in those days I made a good bit of money upgrading and repairing these old Macs. The RAM upgrade was unsoldering the old RAM, replacing with 256K x 1 chips, and there was a little circuit board that soldered into the 7 solder flow through holes located at one end of the 68000 CPU (next to the resistor pack).

    I still have a good bit of Mac 128K parts and pieces in storage.

    Raymond Flowers -

    I am looking for advice on a Mac 128k I bought a few months back it turned on then. Now the power is on lights can be seen through the floppy slot but the monitor doesn’t come on not even static. Any ideas anyone work on the units?

    Louis Reed -

    Please please please shine a flashlight in the case. It has the signatures of the team that designed this mac engraved in the plastic.

    pinky - Contestar

    Seriously, iFixit? Complaining about the non-user upgradeable RAM? Who would ever need more than 128k of RAM??

    JM Palacios - Contestar

    But you could upgrade the memory. I did it on mine!! Going from memory:

    1) order 16 DIP dynamic RAM memory chips (4164, with 64 kilobits each) for a few hundred bucks total.

    2) Carefully bend up the /RAS pin (or maybe it was the /CAS pin) of each DIP

    3) Piggyback the DIPS onto the existing memory chips, and solder the other 15 pins on each one.

    4) Solder a wire daisy-chaining the bent /RAS pins on all 16 of the new 4164s.

    5) I forget whether you had to dead-bug a 74xx TTL onto the board, or if the appropriate chip-select was already in the circuitry, but somehow you got the right signal to go to the daisy-chained RAS line.

    And that's all there is to it.

    David Palmer - Contestar

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I can remember upgrading a Mac - kinda scary since new it cost me like $3,000! All went well and I did a couple of more for friends.

The Lisa was much easier to work with - the stuff just slide out like a tray. Had one that had been converted by Sun Computer in UT. I was the envy of all my friends with that machine - 'big' screen!

Richard Stevens - Contestar

I didn't see anything about discharging the CRT tube. And important step if you are working on such old technology.

Sam Weiss - Contestar

The RAM 'could' be replaced. I know, because I can remember upgrading my 128k machine to 512k on my kitchen table. I wouldn't recommend anyone try it because it's a lot of chips to unsolder.

http://tieudunghay.com/threads/xu-huong-...

http://www.1nhap.vn/threads/9847-Nghe-th...

http://suckhoe123.com/index.php?forums/c...

thuysearching - Contestar

a  e  s  t  h  e  t  i  c

camilojcock - Contestar

Can iFixit do another Take-Apart that is a little newer?

Alec Mitchell - Contestar

I'm opening my mac, same model. Is there any risk of getting electrocuted with the monitor or any other part if the computer has been turned on recently?

Albert Einstein - Contestar

possibly. You always want to make sure that you discharge all the caps including the CRT. NOTE: A CRT can carry a charge even when the display or system is turned off and can build up a secondary charge after the power is removed. Because of dangerously high voltages it is important that you do not touch any of the following parts inside the product housing until after the display is disconnected from its power source and properly discharged.

oldturkey03 -

.05 joules is not "dangerously high". Old wives' tale.

ymcaisnopansy - Contestar

I had one of these in middle school, bought it from the neighbor for $25 including the original box and Apple printer. Wish I still had it, as I could have bought a new MacBook Pro for what they go for on eBay with the original box and manuals!

Tidbit - Mine had a 1MB RAM expansion board in it, it piggybacked in on top of the existing chips with some funky clip that fit over the top of a couple of the chips. Not sure how it worked but the guy I bought it from said that expansion board cost almost as much as the computer did back in 1985 when he bought it!

Andrew Bowers - Contestar

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