The Sinclair QL Forum

OOoOOooO!

I'm excited for your next installment, Marcel!

OK, no difference in behaviour with the SGC in my Iss5.

Looking more and more like the SGC ROM version...

Hi again When I test with LBYTEs in to a RESPR'd area, I get a crash but looking very different. The memory reserved was at 4064K, so well out of the contended DRAM range. This test repeatedly results in a very colourful vertical strip-pattern making its way steadily _up_ the display area. When I re...

Hi Martin I actually tested with both the IPC Interrupt enabled (default) and disabled (with that POKE!!53,128) - same result. Whilst I haven't yet tested other memory ranges for LBYTES, Marcel indicated that he had - again with the same result. I'll verify that later today, just to be sure. In any ...

My 11 yr old son will be gutted - one of his favourite activities is spotting Mr Lee in his various cameo roles in all the latest Marvel films...

RIP, Mr Lee!

Hi again Tobi and Martin All good points. Worth taking a step back for a moment. The simple fact that no one seems to have reported such an issue running Minerva (after v1.66 at least) on SGC (and possibly GC - according to Marcel's earlier findings) could be that its not such a common setup and per...

Now my head hurts! Having read the 68k PRM manual again and, as you point out Nasta, the use of not just the two usual USP and SSP, but instead one USP as well as independent Interrupt and Master SPs (ISP/MSP). It does seem possible that Minerva is only catering for a single (Supervisor) stack, wher...

Thanks Martin - it was good to re-read your older post and gives me some other ideas to consider. Meanwhile, I've burnt a fresh EPROM with Min 1.98 + Marcel's IO fix, but with the enable/disable interrupt instruction-pair in the MDV Scatter routine effectively removed (actually, replaced with 4x NOP...

Thanks Marcel! Meanwhile, I had satisfied myself that those low-level MDV routines (as used by the Scatter routine - md_read and md_sectr) that are patched by SGC are identical* to the original Minerva routines and definitely sit at the right memory locations (1CC30 and 1CC52). * The only changes ap...

Hi Derek

Thanks - yes, I have been using DEA to disassemble the routines around those 'patched' addresses and then, painstakingly, trying to match-up against the original Min v198 source - to discover which routines these represent...