Search found 5118 matches
- Sun Mar 31, 2024 11:52 am
- Forum: ZX BASIC
- Topic: Forcing an NMI or locking the keyboard via poke command
- Replies: 1
- Views: 664
Re: Forcing an NMI or locking the keyboard via poke command
You can't force a NMI. A NMI is a non-maskable interrupt which is a hardware signal. Machine code can jump to the address where the NMI routine is, but it's not quite the same. Machine code can HALT the processor, just execute the HALT instruction. But this will not do what you want on a ZX81. I pre...
- Sun Mar 31, 2024 11:38 am
- Forum: Hardware
- Topic: SOLVED !! opus discovery questions
- Replies: 7
- Views: 710
Re: opus discovery questions
can a " twisted " cable solve this ? Not with a twisted cable designed for PCs, as it will also twist the motor on line, but the Opus only has a single (common to all drives) motor on signal, as it uses a Shugart interface. Shugart interface Floppy Drive Interface Pin Function 2 /DCD Disk Change De...
- Sun Mar 31, 2024 10:22 am
- Forum: SALES
- Topic: Memotech 16K RAM pack - broken connector. ZXPand case? £10 plus p&p
- Replies: 10
- Views: 863
- Sat Mar 30, 2024 2:54 pm
- Forum: SALES
- Topic: Memotech 16K RAM pack - broken connector. ZXPand case? £10 plus p&p
- Replies: 10
- Views: 863
Re: Memotech 16K RAM pack - broken connector. ZXPand case? £10 plus p&p
The link that Lardo posted?sP1d3r wrote: ↑Sat Mar 30, 2024 10:47 amThe link is broken, BTW.Lardo Boffin wrote: ↑Fri Mar 29, 2024 12:14 pm I believe you can configure these to be used as master / slave RAM packs:
https://k1.spdns.de/Vintage/Sinclair/80 ... Manual.txt
It works for me.
Anyway, I've attached a copy.
Mark
- Fri Mar 29, 2024 12:32 pm
- Forum: Hardware
- Topic: ZX Spectrum +2a issue with all expansion cards
- Replies: 8
- Views: 811
Re: ZX Spectrum +2a issue with all expansion cards
With your Kempston joystick interface fitted, test the signals I mentioned in my earlier post to see if any are flatlining or otherwise wrong. So, test these pins on the Z80: Pin Signal 6 Clock 7 D4 8 D3 9 D5 10 D6 12 D2 13 D7 14 D0 15 D1 17 /NMI (should be always high) 18 /HALT (should normally be ...
- Thu Mar 28, 2024 9:30 pm
- Forum: Hardware
- Topic: ZX Spectrum +2a issue with all expansion cards
- Replies: 8
- Views: 811
Re: ZX Spectrum +2a issue with all expansion cards
Not sure it's the ULA. Depending on which version (there were a surprising number not including the various clones), a basic Kempston joystick interface only typically uses the eight data bus lines (D0 to D7), address line A5 (and sometimes A6 and A7), /RD, /IORQ and sometimes /M1. And obviously, +5...
- Thu Mar 28, 2024 6:19 pm
- Forum: GAMES
- Topic: how to make something intentionally crappy for the CGC 2024
- Replies: 24
- Views: 2489
Re: how to make something intentionally crappy for the CGC 2024
Yes, I think you can use those.
Mark
Mark
- Thu Mar 28, 2024 7:48 am
- Forum: Welcome Area
- Topic: Hiya from voorsk
- Replies: 6
- Views: 719
Re: Hiya from voorsk
Hello and welcome to our forum Graham! :D :D :D I hope you enjoy this forum :D You are welcome to ask questions! I've not heard of the ULAdigitizer before. It looks like it either copies the video data from the ULA data bus when the ULA reads the video data from the 'lower' RAM, or when the Z80 wri...
- Sun Mar 24, 2024 5:25 pm
- Forum: GAMES
- Topic: how to make something intentionally crappy for the CGC 2024
- Replies: 24
- Views: 2489
Re: how to make something intentionally crappy for the CGC 2024
No, you can use any computer language that was/is available for the Sinclair machine you are using.
Mark
Mark
- Sun Mar 24, 2024 5:23 pm
- Forum: SALES
- Topic: Best tan ever on a ZX80?
- Replies: 2
- Views: 798
Re: Best tan ever on a ZX80?
No
Mark
Mark