|The gray box is the main controller. It could take
over control of the buss and slow down, or step the CPU.
The Black box is a Heathkit Dual Floppy holder. I could not get their control card to work in my system, so I designed my own which is the first tall blue card.
The green board is a video card. The only card I purchase. I didn't have enough know how to make an analog card. It used an S100 buss. My buss was wired as I need it.
The board with all the chip is my first 4k of memory. Each chip is 1x1k. Its the only part I used from my first computer, an Intel 8080, it ran from Jul 1976 - 1978
The first white board is the z80 CPU board. The 3rd was a memory board that was always on. It was my OS. Later the I used EPROM.
The card in the cable it a real time clock. The same chip that was later used in the AT type computers.
The red cable goes to the math processor board.
It had a total of 27k of ram, with 4 2k EPROM. 1k of video memory.
I wrote a word processor, an accounting program, some games, assembler, debugger and dissembler. And of course the OS.
Later I bought a Commodore 64. I connect the 2 computer through a parallel port. I wrote a assembler on the z80 for the 64. My 64 debugger was the z80.
The computer worked for 10 years then the wire wrap started to fail. It was a sad day when I turned it off the last time.
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