The Sinclair QL Forum

Ah yes, OK, same concept but achieved by different means :) Pretty sure those things didn't exist back in the day - we used long-pin turned sockets (designed for thick multi-layer PCBs, I believe). Got the scaling wrong on Mk I and the pin pitch was just fractionally under 0.1", requiring a bit of ...

Hi Jonathan, would be nice to read more about the Pointer I/F and Wman in a separate thread. When it was designed, how it would be designed this way and why has it changed to use secondary windows just inside the primary window.
Can't promise I can remember much about it! But it's worth a go ...

so looking at those stripped circuit boards - the chip under the ROM was a 13 Input NAND gage - so presumably used to do the finer address decoding for the SDA / SCL
Using a 7430 (8 input NAND) would have been enough, SGC allows direct access through to $BF80-BFFF.

The 74LS133 was (I believe ...

Derek_Stewart wrote:There is a way to not have the Eprom legs bent out, just needs the PCB altered to suit.

Really? Pretty sure we "wouldn't do it just just for fun"... (points for getting the quote there)

Cheers

Jonathan

Hi,

The PCB layout file is very interesting.

I am in the process of drawing the PCB schematic in KiCad, with a view to reproduce the Minerva MKII.

Are there any copyright restrictions?

I do not suppose the Minerva Mk I PCB layout is available?
Well, I originally drew it, but then TF took ...

First post!

Here's a PDF of the PCB layout from the original sources, before the RiscPC went belly up. Planning to fix it tomorrow. Stu did send me a disassembly of the GAL logic, which I've switched around and commented, but it's unchecked so I'll leave posting that until I'm a bit surer. can't ...