Components
This is a comprehensive list of the integrated circuits in the original Macintosh:
- a Motorola MC68000 microprocessor at clock speed 7.8336 MHz
- 64 or 128 KB of ROM in two chips containing parts of the operating system
- 128 or 512 KB of RAM in 16 chips
- eight TTL chips implementing a video and sound DMA controller, plus
- two TTL chips providing a 16-bit video buffer (74166 type)
- one PAL chip generating video timing signals (LAG)
- two TTL chips providing an 8-bit Pulse-width modulation sound driver (74LS161 type)
- two analog chips providing sound amplification (MC14016 switch, LF353 op-amp)
- a Zilog 8530 chip controlling two RS-422 buses through two driver chips
- an Integrated Woz Machine 400 KB floppy disk controller plus support PAL (ASG)
- a 6522 VIA bridge chip connecting to the keyboard and clock
- an Apple real-time clock chip plus a 32.768 kHz quartz oscillator
- an Intel 8021 microcontroller in the keyboard
- bus control and extra logic including
- two PAL chips to activate the other chips (BMU0/1)
- two PAL chips to convert the 16 MHz clock to other timing signals (TSM, TSG)
- two TTL chips buffering the RAM to the 68000 (74LS244 type)
- some inverters (74LS04 type)
This personal computer was implemented in four special-purpose LSI chips, six MSI PALs, 19 chips of standard SSI/MSI logic and analog circuits, plus memory. Most of the simpler chips would be consolidated into a few custom chips in the next generation, much reducing cost.
Read more about this topic: Macintosh 128K/512K Technical Details
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