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Questions tagged [homemade]

for questions about homemade or homebrew retrocomputing hardware and software

0
votes
0answers
72 views

Arcade fight stick too long [closed]

I'm building an arcade cabinet, and finding one part of the control panel to be very frustrating: the joystick rod is too long and so it can move in and out of the panel. The sticks that I bought ...
10
votes
4answers
943 views

Smallest/Simplest, modern pure relay computer with at least 4-bits data words

There are a lot of designs out there of modern home made relay computers (not just ALUs but real computers -let's call them Turing complete, although Turing complete is not enough for having an ...
4
votes
1answer
233 views

Can't get the AY-3-8913 sound chip to work with my z80 (added schematic)

I'm trying to get the ay-3-8913 sound chip to work with my z80 but so far I haven't gotten any sound output yet. I know the chip, my amp circuit and the clock circuit work because it works when I ...
11
votes
3answers
567 views

z80 crashes after executing some instructions

I'm building my own Z80 computer but I'm having a very strange problem. Consider this code: ld a,0xaa out (00),a jp a That works as expected, outputting 0xaa on port 0x00. Now consider this code: ...
1
vote
1answer
316 views

How to I give instructions to a Z80 CPU [duplicate]

I found a Z80 CPU lying around my house. I've search all over the Internet but I still don't know how do I input stuff and tell it what to do. Help me please
19
votes
2answers
2k views

Wiring a Zilog Z80

I've recently got hold of an old Zilog Z80 microprocessor and I know how to clock and test it. I do not however know how to connect RAM, I/O ports, control switches (for programming instructions into ...
6
votes
1answer
377 views

Is there a KiCad library with parts used in retrocomputers?

I ran into this question a few times and couldn't find any acceptable answer: Once I was trying to reverse engineer a card that had chips like Intel's 8255 PPI, 8226 bus drivers and some other ICs. I ...
5
votes
1answer
193 views

Homemade ROM cartridge for Thomson TO7/70 home computer

I recently acquired a Thomson TO7/70 home computer. It came without any MEMO7 cartridges (ROM cartridges) that are necessary to properly use it. I found images of the ROMS, and a schematic, so in ...