The Sinclair QL Forum

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 ...

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). I didn't check about...

Pr0f wrote: ↑Fri May 03, 2024 6:23 pm I think the eprom sockets decode out as 32K chunks - so you can get 2 16K ROM images per 27256 Eprom.

This will be the next try.

Hello again, I burned a 27128 eprom with the CSTQD118 scrambled firmware and everything works ok. :D About CST Ram plus card, i populate the four empty sockets with varius eproms like 27128 and 27256, programmed with TKII, ICE, MonQL, SpeedScreen, 68K/OS(32KB), Prospero(32KB) and not even one was re...

Hello again! I populated the CST Ram Plus card and i have some questions. I used 2N2222A instead of MPS2369. Both are NPN transistors and from the datasheets they seem to be interchangeable? Second, at the block diagram the lower right resistor is a 47KΩ or a 4.7KΩ resistor? And final, all eproms ar...

HI to all! Recently i purchased a 512KB CST Rom Plus card. I want to ask which eprom programs i can burn to populate the four empty rom sockets. CST_Ram_Plus.jpg CST_ram_Plus (2).jpg Secondly, i assemble a CST QDISC v4 floppy disc controller, but it is not recognized on boot screen(green letters on ...

Hello everyone! Is by any chance available the PAL16R4ACN file, which is found on a Sandy Q board 512K RAM doughterboard?

Dave wrote:Yes. Sometimes, shocks can travel from the unprotected RGB socket directly to the 8301 and blow an output.

5.6V zeners to ground from all five lines would be prudent, if you're comfortable to retrofit them.

wouldn't be better to use 5.1V zener diodes?

Completed. A great game! Thank you!

dilwyn wrote:And for your QL's hairdressing needs, visit Llandudno...
(this is on Facebook so not everyone might be able or wish to see the page)

https://www.facebook.com/QDosSalon/