Search found 5122 matches
- Fri Apr 05, 2024 12:25 am
- Forum: Hardware
- Topic: Cursor off-screen
- Replies: 9
- Views: 632
Re: Cursor off-screen
The cursor is not likely to be off-screen, more likely is that the video contrast (voltage) is wrong. Hence the K cursor may be there, just not visible. If the picture size was incorrect, I would expect a rolling image, due to incorrect sync. Keep in mind that the transistor type composite modificat...
- Thu Apr 04, 2024 5:26 pm
- Forum: Hardware
- Topic: how to verify if a multiface 1 is working correct ??
- Replies: 18
- Views: 5431
Re: how to verify if a multiface 1 is working ??
Ahh, I was going to reply the other day, must have forgotten
As the Opus also uses it's own ROM, has the previous owner fitted or modified the MF1 board with a switch or some other method to disable/prevent it's ROM and RAM from being paged in?
Mark
As the Opus also uses it's own ROM, has the previous owner fitted or modified the MF1 board with a switch or some other method to disable/prevent it's ROM and RAM from being paged in?
Mark
- Thu Apr 04, 2024 5:23 pm
- Forum: Welcome Area
- Topic: Thanks for letting me join
- Replies: 3
- Views: 370
Re: Thanks for letting me join
Hello and welcome to our forum Luke!
I hope you enjoy this forum
You are welcome to ask questions!
Mark
I hope you enjoy this forum
You are welcome to ask questions!
Mark
- Tue Apr 02, 2024 5:00 pm
- Forum: SALES
- Topic: Memotech 16K RAM pack - working. £20 plus p&p
- Replies: 8
- Views: 1305
Re: Memotech 16K RAM pack - working. £20 plus p&p
As Moggy says, a PM/DM will sit in your outbox until the recipient reads it. Only then will it move to your sent box.
Mark
- Sun Mar 31, 2024 11:52 am
- Forum: ZX BASIC
- Topic: Forcing an NMI or locking the keyboard via poke command
- Replies: 1
- Views: 776
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: 1394
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: 1916
- 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: 1916
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: 2871
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: 2871
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...