Questions tagged [homemade]
for questions about homemade or homebrew retrocomputing hardware and software
15 questions
9 votes
3 answers
3k views
What is the purpose of the M1 pin on a Z80
I've been looking through bits of documentation about the (sadly recently discontinued) Z80 processor and the machines people have built with it. One thing I noticed is pin 27, called "M1", ...
- 253
8 votes
1 answer
505 views
Are there any homebrew games (or demos) for the Timex/Sinclair 2068?
I know there has long been a thriving homebrew scene for games and demos for the original Sinclair Spectrum range and also for the Russian and Eastern Bloc Spectrum clones. But I expected some old ...
- 8,214
4 votes
1 answer
1k views
Commodore 64 board dimensions
What are the dimensions of the C64 motherboard? I am specifically asking this because I am considering using a 64C case (these still seem to be in production) for an 8-bit homebrew machine. I wonder ...
10 votes
1 answer
1k views
Can you program an arcade game and have MAME or another emu run it?
I know Mame works with drivers for each game or hardware, and it checks for specific ROMs, and I guess it might check also for some checksum to verify the ROMs integrity. Is there some way you could ...
- 321
13 votes
4 answers
4k 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 ...
- 549
11 votes
3 answers
2k 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: ...
- 394
24 votes
3 answers
9k 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 ...
- 343
8 votes
2 answers
904 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 ...
- 34.7k