Search found 5101 matches

by 1024MAK
Thu Mar 21, 2024 3:41 pm
Forum: Hardware
Topic: ZX Spectrum +2a issue with all expansion cards
Replies: 4
Views: 281

Re: ZX Spectrum +2a issue with all expansion cards

Okay.

All those require the machine to page out the internal ROM chips. Do you have any other expansions/interfaces to try, such as a Kempston (or compatible) joystick interface?

Mark
by 1024MAK
Wed Mar 20, 2024 10:01 pm
Forum: Hardware
Topic: Spectrum modded / composite question
Replies: 19
Views: 707

Re: Spectrum modded / composite question

Some important things you need to know about the type of Ferranti ULA chips used in Sinclair computers: They use a type of bipolar transistor technology. This is very different to the other large chips used in the ZX Spectrum. The matrix cells (that provide the logic functions) are CML (current mode...
by 1024MAK
Wed Mar 20, 2024 7:31 pm
Forum: Hardware
Topic: ZX Spectrum +2a issue with all expansion cards
Replies: 4
Views: 281

Re: ZX Spectrum +2a issue with all expansion cards

Which expansion cards / interfaces have you tried?

Mark
by 1024MAK
Tue Mar 19, 2024 4:28 pm
Forum: ZX BASIC
Topic: Strange integer behaviour
Replies: 11
Views: 533

Re: Strange integer behaviour

The internal ROM function that converts a floating point number to a string is almost certainly the same routine that converts it for printing to the screen.

Mark
by 1024MAK
Mon Mar 18, 2024 6:28 pm
Forum: ZX BASIC
Topic: The PAUSE Bug Explained
Replies: 1
Views: 187

Re: The PAUSE Bug Explained

Thank you 8-)

Mark
by 1024MAK
Sat Mar 16, 2024 7:05 pm
Forum: Hardware
Topic: opus discovery questions
Replies: 4
Views: 227

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...
by 1024MAK
Sat Mar 16, 2024 6:01 pm
Forum: Hardware
Topic: how to verify if a multiface 1 is working ??
Replies: 11
Views: 502

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
by 1024MAK
Sat Mar 16, 2024 2:40 pm
Forum: Hardware
Topic: Atari joystick without ZXpand+
Replies: 33
Views: 1064

Re: Atari joystick without ZXpand+

kmurta wrote: Sat Mar 16, 2024 1:47 pm The Brazilian clones TK82/TK83/TK85 had a joystick input using this scheme. Line A12 is common for keys 6, 7, 8, 0 and line A11 is common for key 5.

The Atari joystick needs to be modified to work in this scheme.
Thank you. That's what I thought.

Mark
by 1024MAK
Sat Mar 16, 2024 10:58 am
Forum: Hardware
Topic: Atari joystick without ZXpand+
Replies: 33
Views: 1064

Re: Atari joystick without ZXpand+

Spinnetti wrote: Sat Mar 16, 2024 3:10 am back in 82, I simply cut a hole in the case, put in a joystick port, and hardwired it to the arrow keys... pretty simple....
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
by 1024MAK
Fri Mar 15, 2024 10:31 pm
Forum: Software
Topic: ZXpand+ JOYCFG.TXT file
Replies: 7
Views: 427

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