The Sinclair QL Forum

Is for version 4 of the CST, so in the one with version 1.18, if you have 1.16 or below the board is different and not compatible.
I do not have information of anybody with version 1.17, but if any have a picture I can indicate you with version is the maximum.

I use a tool for windows call "AFS Rom Suite MD – Utility" this allow several things, like split and join roms, and swaps bits and address line, in the "pins -> Address Pins (8bits)" is possible to configure the changes to modify the ROM, you can even save the configuration for later use.

I just ...

I have Bads and Goods News, I think is funny, but not sure that other think the same...

I was in contact with Andrews Craig from facebook, he has a working 1.19 Interface and a eprom programmer, so he was kind enough to remove ROM from his interface and read it.

(And this is de Bad News) his ...

I want to remember that I have the schematic and PCB of the Thor here:
https://github.com/alvaroalea/QL_Thor20/tree/main/Thor_20_expansion

The memory expansion are basically 2 multiplexer, 2 chained buffer, a GAL and de 16 RAM chips, but other logic are also involved.

Unfortunately, I do not have ...

Thanks Your so much Nasta (and other) for the aditional information, now I understand clearly how the memory is accesses in Aurora (and GC/SGC).

Only one doubth:


When Aurora is used with SGC, the whole 256k of it's video RAM can be accessed (on SGC this is $4C0000 to $4FFFFF) but the video ...

What I'm missing? The only Idea is that SuperGold card maped this area as the top 256Kb of the fist megabyte (wiring QL's A19 to A24 and QL's A18 A21*A20) or something like this.

That simply is internal to the SGC. The Aurora doesn't see (cannot, the address lines are not there) the "4" in the ...

I'm trying to understand how aurora graphics work, and if will be possible to implement in the QL Cores for FPGA.

But there is a think that I can't catch:

- Aurora has a 256Kb RAM in his board, of this 240Kb are used for Video Memory, the other 16Kb it's not clear, but I don't care by now ...

Yes, sorry key swap, is R3, (I edited the original message to avoid confusion in the future).
Check the picture attached, both diodes in the same position.

Charging circuit is very simple, a resistor limit the charging current, thats all:
* NiCd and NiMh batteries are expected to charge at a ...

Sorry for reply to late.

Regarding pins of the conector, I'm not sure because I use "standar" from Kicad, so probably it's reversed, I will check and update the PCB if need.

ML2032 is a litium rechargable battery and need a special charger circuit, you shall not conect to the minerva circuit, it's ...

Hi, Hello from Asturias! :-D

Happy to read that you decided to not sell the QL.

With the video and the Tetroid clone you have a good point for start.
One additional upgrade you shall have in mind, is a Hermes chip, if you consider that the keyboard still not going well with the new membrane.

For ...