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by martyn_hill
Fri Nov 16, 2018 3:03 pm
Forum: Hardware
Topic: Possible problem with cloned SGC and Minerva 1.98
Replies: 47
Views: 1541

Re: Possible problem with cloned SGC and Minerva 1.98

Well, thanks Marcel! I have recompiled Minerva with the tiny change Marcel describes in his blog to the Scatter-load routine in mdvsc_asm and can confirm that LBYTES now works again on Min 1.98! Amazing bit of detective work - I am in admiration! It remains to be seen whether we should rev. Minerva ...
by martyn_hill
Fri Nov 16, 2018 11:40 am
Forum: Hardware
Topic: Possible problem with cloned SGC and Minerva 1.98
Replies: 47
Views: 1541

Re: Possible problem with cloned SGC and Minerva 1.98

OOoOOooO!

I'm excited for your next installment, Marcel!
by martyn_hill
Thu Nov 15, 2018 8:50 pm
Forum: Hardware
Topic: Possible problem with cloned SGC and Minerva 1.98
Replies: 47
Views: 1541

Re: Possible problem with cloned SGC and Minerva 1.98

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

Looking more and more like the SGC ROM version...
by martyn_hill
Wed Nov 14, 2018 7:34 pm
Forum: Hardware
Topic: Possible problem with cloned SGC and Minerva 1.98
Replies: 47
Views: 1541

Re: Possible problem with cloned SGC and Minerva 1.98

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...
by martyn_hill
Wed Nov 14, 2018 11:19 am
Forum: Hardware
Topic: Possible problem with cloned SGC and Minerva 1.98
Replies: 47
Views: 1541

Re: Possible problem with cloned SGC and Minerva 1.98

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 ...
by martyn_hill
Tue Nov 13, 2018 8:46 pm
Forum: The Off-Topic Section
Topic: Stan "The Man" Lee has gone...
Replies: 2
Views: 125

Re: Stan "The Man" Lee has gone...

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!
by martyn_hill
Tue Nov 13, 2018 2:17 pm
Forum: Hardware
Topic: Possible problem with cloned SGC and Minerva 1.98
Replies: 47
Views: 1541

Re: Possible problem with cloned SGC and Minerva 1.98

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...
by martyn_hill
Mon Nov 12, 2018 11:36 pm
Forum: Hardware
Topic: Possible problem with cloned SGC and Minerva 1.98
Replies: 47
Views: 1541

Re: Possible problem with cloned SGC and Minerva 1.98

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...
by martyn_hill
Mon Nov 12, 2018 10:43 pm
Forum: Hardware
Topic: Possible problem with cloned SGC and Minerva 1.98
Replies: 47
Views: 1541

Re: Possible problem with cloned SGC and Minerva 1.98

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...
by martyn_hill
Sun Nov 11, 2018 10:04 pm
Forum: Hardware
Topic: Possible problem with cloned SGC and Minerva 1.98
Replies: 47
Views: 1541

Re: Possible problem with cloned SGC and Minerva 1.98

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...

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