Search found 145 matches
- Wed May 15, 2024 3:27 pm
- Forum: The Off-Topic Section
- Topic: Z88 power supply
- Replies: 3
- Views: 50
Re: Z88 power supply
Ideally you want one with an LED. I added one to mine since it was too easy to be unaware you were running on batteries and the mains switch wasn't on
- Mon May 13, 2024 12:19 pm
- Forum: Hardware
- Topic: CST Ram Plus eproms - CST QDisc v4 issue
- Replies: 20
- Views: 981
Re: CST Ram Plus eproms - CST QDisc v4 issue
If this byte sequence is used only for 16KB bin files for the Rom slot what about the 32KB rom files? The byte sequence $4AFB0001 can be used for any size ROM files (within available space), not just 16K. AFAIK that sequence was chosen because it was least likely to occur in normal binary files. An...
- Sat May 11, 2024 12:05 pm
- Forum: Hardware
- Topic: CST Ram Plus eproms - CST QDisc v4 issue
- Replies: 20
- Views: 981
Re: CST Ram Plus eproms - CST QDisc v4 issue
AFAIK the 68K/OS(32KB) file is a complete operating system replacement so I don't expect it to be recognised by QDOS/Minerva. Though it will be interesting to see if t0nyt's 68K/OS PCB can be realised as a schematic
- Sat May 11, 2024 11:49 am
- Forum: Hardware
- Topic: CST Ram Plus eproms - CST QDisc v4 issue
- Replies: 20
- Views: 981
Re: CST Ram Plus eproms - CST QDisc v4 issue
OK, the first thing to do would be to look at each of the files you wanted to add to EPROM in a hex editor. If they are true QL ROMable files then the format of the first few bytes is defined: $4A,$FB,$00,$01 unique identification word for ROM code $??,$?? offset to list of names of new SupreBASIC p...
- Sat May 11, 2024 10:45 am
- Forum: Hardware
- Topic: CST Ram Plus eproms - CST QDisc v4 issue
- Replies: 20
- Views: 981
Re: CST Ram Plus eproms - CST QDisc v4 issue
Do the files in EPROM have the required ROM header ident/banners at the 16K boundaries where needed? It would be easy enough to knock up simple SuperBasic script to PEEK at the appropriate places and show first few bytes (i.e. at each 16K boundary in top 256K of QL's 1Meg map).
- Tue May 07, 2024 10:02 am
- Forum: Software & Programming
- Topic: QSTAR 1
- Replies: 29
- Views: 1942
Re: QSTAR 1
But also
- Sun May 05, 2024 10:51 am
- Forum: Software & Programming
- Topic: 68K/OS "ROM" based disk attempt
- Replies: 34
- Views: 1376
Re: 68K/OS "ROM" based disk attempt
Would doing a cartridge dump using FORMAT RAM1_MDV1 be possible? (assumes at least map is same as normal QL mdv.)
- Sun May 05, 2024 10:42 am
- Forum: The Off-Topic Section
- Topic: Identity of PiHER 8C2K2 chip?
- Replies: 1
- Views: 351
Re: Identity of PiHER 8C2K2 chip?
Surely nothing more than DIP resistor packs (pull ups?).
(Looks like variation on https://www.jupiter-ace.co.uk/hardware_ ... oller.html)
(Looks like variation on https://www.jupiter-ace.co.uk/hardware_ ... oller.html)
- Wed May 01, 2024 7:24 pm
- Forum: Hardware
- Topic: CST Ram Plus eproms - CST QDisc v4 issue
- Replies: 20
- Views: 981
Re: CST Ram Plus eproms - CST QDisc v4 issue
I would at least try a logic probe on eprom select (pin 22 /OE) to see if after a reset it is at least polled to help start narrowing problem down.
Edit: removed text about jumbled roms; V4 is jumbled
Edit2: I use 'jumbled' (not scrambled) since that is what QEP III uses.
Edit: removed text about jumbled roms; V4 is jumbled
Edit2: I use 'jumbled' (not scrambled) since that is what QEP III uses.
- Mon Apr 29, 2024 6:56 pm
- Forum: Hardware
- Topic: S3 Reset Switch replacement
- Replies: 4
- Views: 383
Re: S3 Reset Switch replacement
We're gonna need a bit more info than that, it's a big sitePopopo wrote: ↑Mon Apr 29, 2024 4:02 pm it seems I have found the direct replacement on Aliexpress.
https://www.aliexpress.com/p/order/index.html