Questions tagged [8080]

For questions about the Intel 8080 8-bit microprocessor

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Why is the original Altair BASIC (for the 8080 CPU) source code not available on-line?

As described by The Register in 2001, around 1987 journalists and others started asking Bill Gates for a copy of the source code for the original version of Altair (eventually Micro-Soft) BASIC, ...
7
votes
1answer
364 views

Why was the Altair numbered "8800" even though the processor was an 8080?

The Altair 8800 was a computer using the Intel 8080 processor. Why the difference in numbers?
5
votes
0answers
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Manual for DIAGNOSTICS II V1.2 – CPU TEST SUPERSOFT ASSOCIATES

I am building a 8080 emulator. I found some useful test suites here. The emulator passes the first test suite (8080/8085 CPU Diagnostic, version 1.0, by Microcosm Associates), but not the second (...
4
votes
0answers
227 views

Game Boy interrupt handler crashes unless I jump to it indirectly

I have an interrupt handler I created, which is meant to reduce the overhead of interrupts as much as possible. Setting up the interrupt handler is done while interrupts are disabled, of course. It ...
1
vote
0answers
92 views

Getting a loading seam to work with 2x2 metatiles

I'm working on a prototype for a scrolling loading seam similar to Pokemon where the screen scrolls incrementally by 8 pixels with each direction button press, and new tile graphics are drawn off the ...