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I bought an Imsai 8080 when they came out, but I was not as ambitious as you. I sold it to a friend a few months later, and bought an Apple II instead. I still have fond memories of that computer. It was loaded, too. It came with 48k of RAM, and I bought a 16k expansion board which I believe shared address space with the operating system, which was on EPROM. Can't remember how Woz did that. I actually used the computer for useful purposes, too. I found a Spice-like "kernel" in some magazine (probably Byte). I wasn't smart enough to write my own circuit analysis program, but I took that one and added extensive plotting capabilities to it. I used the program (it only did linear analysis) for some consulting work I was doing. I also played with assembly language programming, and wrote a "Game of Life" (anybody remember this?) program in 6502 ass'y language.Dean Huster said:Z80? That new? That Compaq has a keyboard! What's that?!!??
If you want a relic, I still have my MITS Altair 8800, 8080 processor with 256 bytes (yes, BYTES) of memory as delivered for $500. It's been upgraded to 12KB of static RAM, video card, serial and parallel card, etc. Keyboard? What was that? You had to find a surplus one of those and interface it to the Altair and write a program to read it. Same with interfacing to the monochrome video monitor. I bought a new Montgomery-Ward B&W TV on sale just for the purpose of ripping out everything that was TV and modifying the rest for the best composite input I could get. The only requirement for the TV other than price was that it had to include the schematic so that I knew what to rip out and what to keep.
Books like that for sale at such inflated prices makes me want to start offering all of my old "antique electronics" books and magazines on epay and see if I can get enough dinero to make a few house payments.
Dean
on1aag said:Hi Marks256,
This one is a bit cheaper:
https://www.amazon.com/Build-Your-Own.../dp/0070109621
on1aag.
Blueroomelectronics said:Get your head out of that old Z80.
Your room is already cluttered with old relics
Marks256 said:**broken link removed**
but at 56 USD, it isn't cheap!
Why must being a geek cost so much?
... and wrote a "Game of Life" (anybody remember this?) ...