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Can anyone help me fix the Turbo XT BIOS on UniPCemu?

Posted on 2016-09-20, 08:02

in PC Emulation

in PC Emulation

The Generic Super PC/Turbo XT BIOS v2.6 used to work up to and including the commit at 2016/9/14 18:37 ( https://bitbucket.org/superfury/unipcemu/commits/d45134d1de918230c01d00e5e168441556553dbd?at=master ). Ever since then, the BIOS simply won't boot anymore. I've made a little log of what the BIOS …

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-19, 19:23

in PC Emulation

in PC Emulation

Just tried running the old Turbo XT v2.5 BIOS on my current commit(80186/NEC V30 emulation): It screws up royally:( Something I did the last few weeks killed the XT emulation for some reason. Although I've mainly worked on the MMU and 80286(Besides various optimizations). Unfortunately part of the …

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-18, 09:30

in PC Emulation

in PC Emulation

Whoops, now that you say it... :S You're right:P Looking at the protection code at that point (normal MMU address verification) had the limit check executed, but not applied (it calculated a variable which stores the boolean result of the comparision with the limit, then reverses(NOT) that when …

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-17, 21:34

in PC Emulation

in PC Emulation

The BIOS does something strange, though: MOV AL,9DH ; SET INTERRUPT 13 FLAG OUT DMA_PAGE+0AH,AL ; FOR THE INTERRUPT HANDLER ;----- MODIFY DESCRIPTOR TABLES ;----- SET TEMPORARY ES DESCRIPTOR TO SEGMENT LIMIT MOV DS:ES_TEMP,SEG_LIMIT,0 ; SET SEGMENT TO 0 ;----- CPL0, DATA ACCESS RIGHTS MOV BYTE PTR …

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-17, 12:35

in PC Emulation

in PC Emulation

It now gets to the top of memory (Exactly 6MB installed) and errors out: 06144 KB OK 660000 FFFF 201-Memory Error This matches the end-of-RAM in my emulation (Exactly 6MB is installed, with the memory buffer area from 640K-1M being inserted at 1M+, thus adding 0x60000 memory bytes on top of the …

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-17, 11:24

in PC Emulation

in PC Emulation

I've modified and adjusted that little loop by adjusting the 80286 (actually 8086 timings) so that the count ends up with exactly F952 ticks counted. It now correctly continues without erroring out at the DRAM Refresh speed test (ending up with a '8086' at 7280500Hz). Edit: It now gets up to this …

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-17, 09:34

in PC Emulation

in PC Emulation

This is the output given by the PIT (and diagnostics) for ports 0x40-43 and 0x61: UniPCEMU_logs_20160917_1131.zip I've modified the logs to properly report as 'data'(0x40-0x42), ''command'(0x43) and 'misc'(0x61). The diagnostic output is also in the archive. Edit: The results with Windows' findstr " …

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-16, 21:20

in PC Emulation

in PC Emulation

Modified the speaker bit to give output of timer 2 directly, timer 1 toggles with each rise. https://bitbucket.org/superfury/unipcemu/src/ … pit.c?at=master Is this correct?

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-16, 20:45

in PC Emulation

in PC Emulation

https://bitbucket.org/superfury/unipcemu/src/ … pit.c?at=master This modifies the PIT1&2 status bits at port 0x61 to toggle(XOR) each time the PIT1&2 rise(go from 0 to 1). Is that correct?

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-16, 20:09

in PC Emulation

in PC Emulation

I've included port 61h access, because some of it's bits are from the timers(which is handled by the module as well, bits 0&1 affect the PIT2 gate(bit 0) and PIT2 output mask(bit 1), and bit 4&5 contain the output of PIT1(bit 4) and PIT2(bit 5)). That's why I included it.

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-16, 17:02

in PC Emulation

in PC Emulation

Edit: Whoops. Wrong BIOS(80186 running with XT BIOS)... https://www.dropbox.com/s/9u3myeohg10qqh4/debugger_20160916_1908.zip?dl=0 Uploaded it externally (since it's a bit over 5MB, 90MB unpacked even with zip file compression). And that's just before the BIOS does much (about step 20). It contains …

Creating a virtual differencing hdd image, identifying parent uniquely?

Posted on 2016-09-16, 15:29

in PC Emulation

in PC Emulation

I'm thinking of implementing some kind of differencing sfdimg format for my emulator(UniPCemu). The problem is that the application needs to know if the parent image is the correct image, as well as any changes making the child invalid. What would need to be stored is probably some kind of unique ID …

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-16, 11:59

in PC Emulation

in PC Emulation

I've fixed some 'bugs' in the 8254 chip emulation. But now the IBM AT BIOS screws up some way: It first sounds PIT2 correctly (correct tone). Then, the next beep is programmed with a higher lo/hi value? (08B4h to be exact) Taking older parts of the PIT core, it starts this new error at the last …

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-16, 00:36

in PC Emulation

in PC Emulation

Which ones are used in the IBM PC(/AT)? Do I need to worry about interleaved reads/writes(including BIOSes)? Edit: I've just upgraded the emulation to a 8254 chip. Implemented improved BCD mode and wrapping counters. I've also seperated read and write hi/lo states for all 3 channels. https:// …

Re: Can anyone help me fix my PC-Adlib emulation?

Posted on 2016-09-15, 22:59

in PC Emulation

in PC Emulation

That little sinus only register was indeed a bug I didn't notice. Fixed it right away. You've increased the envelope counter from word to uint_32. Is that really required? About those other edits: - Why did you add those strange retrigger operations? What do they add? - Why did you remove the …

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-15, 21:03

in PC Emulation

in PC Emulation

Yes, already thought so. I've modified the code accordingly: https://bitbucket.org/superfury/unipcemu/src/689b68a7b7b3d7c4381996d09906f7cf1685c0b9/UniPCemu/hardware/pit.c?at=master The latch command now simply loads the current word into the latch register and set a flag(like the read back status …

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-15, 20:28

in PC Emulation

in PC Emulation

Ok. And what about writes? Writes don't need a latch, because it's writing to a reload buffer(in itself a latch for reloading when triggered by starting, depending on the mode)?

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-15, 19:51

in PC Emulation

in PC Emulation

Does the latch always use lo/hi mode or does it use the current mode(1 input in lo or hi mode, 2 inputs in lo/hi mode) to signify it's read mode or completion of the latch(and disabling the latch)?

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-15, 19:36

in PC Emulation

in PC Emulation

So after the latch command completes(both bytes are read), the previous mode is restored(in this case lo byte only mode)?

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-15, 19:23

in PC Emulation

in PC Emulation

Well, the strange thing is: I'm receiving strange command bytes: First it sets command byte 0x54, which sets PIT 1, mode 2, LSB Then it sets command byte 0x40, which latches PIT1(overwrite mode to latch low, high mode). Further commands keep being command 0x40(latch low,high mode)? Or does this …

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