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Maker and classic computing fanatic Dr. Scott M. Baker has designed a single-board pc constructed round what is mostly understood to be the world’s first eight-bit programmable microprocessor: the Intel 8008.
The exceedingly-retro single-board pc construct was impressed by Baker’s earlier work on creating a “downgrade” board for his Heathkit H8, which changed the machine’s unique Intel 8080, launched in 1974, with the sooner and binary-incompatible Intel 8008. Having constructed an Intel 8008 CPU board, then, including the remainder of the pc appears a logical subsequent step.
“I made a decision to take that design and translate it again right into a single board pc, with an non-compulsory show board,” Baker explains. “On the similar time, I made a number of enhancements, for instance rising the banked reminiscence help from 32kB RAM/ROM to 128kB RAM/ROM. Now, we don’t actually need all that RAM, however the ROM is helpful to retailer further packages that could be financial institution switched in.”
The pc itself matches on a single board, making it a real single-board pc, although show and enter take up a second board — providing the seven-segment numerical LED readouts and hexadecimal keypad inputs widespread to computer systems of the period, although with the added bonus of a buzzer linked to a fancy sound generator with three voices and a noise engine and really swish LED backlights to the keys.
“A number of Programmable Logic Gadgets (PLDs) are used to deal with bus indicators, IO [Input/Output] addressing, interrupt help, and many others.,” Baker writes. “The PLDs used are GAL22V10D. Every one replaces a few half-dozen discrete logic chips, vastly lowering board measurement and element depend. There’s nothing magic in them — they’re simply plain strange logic comprised of your typical ANDs and ORs and such.”
The principle board is a completely self-contained SBC with serial connectivity, whereas an non-compulsory show board provides LEDs, a keypad, and sound. (📷: Dr. Scott M. Baker)
On the software program entrance, the machine helps Baker’s customised 8008 Monitor, primarily based on an earlier program written by Jim Loos, Scelbi Primary, Baker’s Jonesforth port 8008-Forth, and Galaxy, a clone of the traditional Star Trek recreation written in 8008 meeting.
Baker’s full write-up is accessible on his web site, whereas design information and supply code could be discovered on GitHub underneath an unspecified license.
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