The Sinclair QL Forum

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

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...

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).

But also

Would doing a cartridge dump using FORMAT RAM1_MDV1 be possible? (assumes at least map is same as normal QL mdv.)

Surely nothing more than DIP resistor packs (pull ups?).

(Looks like variation on https://www.jupiter-ace.co.uk/hardware_ ... oller.html)

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.

Popopo 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

We're gonna need a bit more info than that, it's a big site

Surely only by having a job running on BBQL to periodically copy 32K screen dump through FIFOs to QIMSI Gold

Peter wrote: ↑Sat Apr 27, 2024 1:11 pm You may have noticed 2 x 2 extra pins in addition to the QL ROM port (the smaller ones near to the edge).
One of them is leading QLNET and one is a "detection" pin.
The other two could be used with such a connector board. Possibly one as R/W and one as a chip select.

Gets even better