Thank you
Mark
Search found 5087 matches
- Mon Mar 18, 2024 6:28 pm
- Forum: ZX BASIC
- Topic: The PAUSE Bug Explained
- Replies: 1
- Views: 130
- Sat Mar 16, 2024 7:05 pm
- Forum: Hardware
- Topic: opus discovery questions
- Replies: 4
- Views: 167
Re: opus discovery questions
The best source of help with the Opus Discovery is to work your way through the topics over on WoSf . And yes I think you can use a PC 3½ inch disk drive. You will have to change either the internal link, zero ohm link or the cable wiring so that the drive responds to the DS0 signal from the Opus Di...
- Sat Mar 16, 2024 6:01 pm
- Forum: Hardware
- Topic: how to verify if a multiface 1 is working ??
- Replies: 4
- Views: 142
Re: how to verify if a multiface 1 is working ??
Is the /NMI signal getting to the Z80?
Is the multiface paging out the BASIC ROM and enabling it's own EPROM?
Mark
Is the multiface paging out the BASIC ROM and enabling it's own EPROM?
Mark
- Sat Mar 16, 2024 2:40 pm
- Forum: Hardware
- Topic: Atari joystick without ZXpand+
- Replies: 33
- Views: 749
- Sat Mar 16, 2024 10:58 am
- Forum: Hardware
- Topic: Atari joystick without ZXpand+
- Replies: 33
- Views: 749
Re: Atari joystick without ZXpand+
Ahh, but number 5 key adds complexity. How did you handle "5" being on a separate half row (and hence using a different "common" line to the rest of the keys)?
Mark
- Fri Mar 15, 2024 10:31 pm
- Forum: Software
- Topic: ZXpand+ JOYCFG.TXT file
- Replies: 7
- Views: 267
Re: ZXpand+ JOYCFG.TXT file
There is most definitely a help or example file somewhere, I've seen it. I just can't remember where...
Mark
Mark
- Fri Mar 15, 2024 9:20 pm
- Forum: Software
- Topic: ZXpand+ JOYCFG.TXT file
- Replies: 7
- Views: 267
- Fri Mar 15, 2024 9:16 pm
- Forum: Hardware
- Topic: ZX Spectrum Issue 6a short
- Replies: 12
- Views: 272
Re: ZX Spectrum Issue 6a short
The ULA only runs off the +5V. And indeed, the actual supply to the core goes via resistor R34 to pin 13. The ULA has no direct connections to the -5V or +12V supplies. ULA pin 14 just supplies the peripheral interface circuitry. The normal cause of problems with the -5V or +12V supplies, TR4 cookin...
- Fri Mar 15, 2024 8:43 pm
- Forum: Hardware
- Topic: Spectrum modded / composite question
- Replies: 16
- Views: 565
Re: Spectrum modded / composite question
Well, with only seven 4116 DRAM chips fitted, it will do something, but no, it will not run BASIC.
The ULA should however produce a picture. What you get depends on which chip is missing. The effect being different depending on which one it is that is missing.
Mark
The ULA should however produce a picture. What you get depends on which chip is missing. The effect being different depending on which one it is that is missing.
Mark
- Fri Mar 15, 2024 1:37 pm
- Forum: Hardware
- Topic: Atari joystick without ZXpand+
- Replies: 33
- Views: 749
Re: Atari joystick without ZXpand+
BASIC always uses its own ROM routines to read the keyboard. At the lowest level, this is the Z80 processor using the Z80 machine code IN instruction. Each keyboard half row has its own I/O address. The data returned is one byte, but only five bits are keyboard data. Hence it takes eight IN instruct...