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Re: Windows NT 3.1/4.0 STOP 0x0000007B?

Posted on 2019-06-10, 13:16

Hmmm.... Looking through the log, I don't see the PUSH EBX instruction actually writing memory(immediately after the very first CALL instruction): 0008:80010e1b E8 A0 0A 00 00 calld 800118c0 RealRAM(p):00010e5a=24($); RAM(p):00010e5a=24($); Physical(p):00010e5a=24($); Paged(p):80010e5a=24($); Normal …

Re: Windows NT 3.1/4.0 STOP 0x0000007B?

Posted on 2019-06-10, 11:23

Hmmm... The final INSW was a word from the 8th hard disk sector(loading sector 0x48 as the next sector, becoming busy for 60000ns('reading the next sector from disk', with an IRQ following that delay to start reading the next sector from the disk controller)). It has 0x37 sectors(started out with …

UniPCemu Basic Linux floppy crash?

Posted on 2019-06-08, 21:51

Basic Linux seems to crash strangely? It tries to IRET(FLAGS highest 4 bits are 0x7), but the task register is NULL(0x0000) without any task loaded, returning to task 0x0001(at logical memory location 0)? I don't see any LTR instruction during boot? It happens somewhere after starting the kernel(CS …

Re: Windows NT 3.1/4.0 STOP 0x0000007B?

Posted on 2019-06-08, 16:50

Just found out something strange booting the Bochs' openBSD floppy disk. It executes a ATAPI reset command, then a ATAPI IDENTIFY, then a ATAPI PACKET command, sends one word, then says "wdc1:0:0: device timeout, c_bcount=0, c_skip=0"? Edit: It seems to be executing the instruction F2666F, which is …

Re: Windows NT 3.1/4.0 STOP 0x0000007B?

Posted on 2019-06-07, 17:49

Just have been looking at the resulting status register when it's updating it during the disk read(PIO read) phase. I see it keeps returning to being 0x58 for all running transfers, but at the point it crashes(when it issues a reset) it suddenly becomes 0xD8? When does said HDD timing set bits 7&8( …

ATA error with 256 sectors left?

Posted on 2019-06-07, 08:43

When a read sector or read multiple request is made that ends with an error on the very first sector of a transfer of 256 sectors(sector count register = 0), what is the resulting value in the sector count register? Does it keep being zeroed(As there's 256 sectors left)? So a value of 0 with an …

Re: Windows NT 3.1/4.0 STOP 0x0000007B?

Posted on 2019-06-07, 02:07

I just fixed some bugs and made the reads/writes using 0 sectors(which actually are 256 sectors) work properly(it was actually reading 0 sectors in that sense, reading a junk buffer). I've also fixed the cases of being able to read past the end of the disk(LBA out of bounds), which caused a wrong …

Re: Windows NT 3.1/4.0 STOP 0x0000007B?

Posted on 2019-06-06, 19:15

Interestingly enough, with those timing bugfixed and BSY signaling being implemented, I see the NT kernel keep reading sectors 0x3F and 0x40 over and over again? Edit: Seeing as it's programmed for n heads and 3F sectors per track, it's testing the track border(head 0 sector 3F and head 1 sector …

Re: Windows NT 3.1/4.0 STOP 0x0000007B?

Posted on 2019-06-06, 16:23

Just tried NT 3.1 again with the latest bugfixes. Now I still see a STOP 0x0000007B (0xFF8FCD30,0x00000000,0x00000000,0x00000000)? One good point is that I do actually see the protected mode driver doing some hard disk accesses? I see it setting up device parameters, then reading the master boot …

Re: Windows NT 3.1/4.0 STOP 0x0000007B?

Posted on 2019-06-05, 21:21

Just reinstalled Windows 95 with the new bugfixes. It once again crashes during esdi_506.pdr(the second one). Perhaps some RTC timing related issue? It's the only compomemt out of sync due to being realtime instead of emulated(for the RTC clock only, synched with Windows 10 in this case, but with a …

Re: Windows NT 3.1/4.0 STOP 0x0000007B?

Posted on 2019-06-05, 11:56

That WD-specific stuff shouldn't affect Windows 95/NT4 and onwards, as they're supposed to run on various hardware? So it had to be compliant, shouldn't it? Edit: After some more bugfixing, it seemed that wasn't the cause(bootlog.txt : ): [00128814] Loading Device = C:\WINDOWS\HIMEM.SYS [00128816] …

Re: Test suite for Win32s/WinG?

Posted on 2019-06-05, 11:52

Sending a bug report for it(for running it in my emulator) isn't really valid, is it? It's a bug in my own emulator, not a real computer? Also, sending bug reports for very old software(if it works at all) probably won't be looked at anymore?

Re: Windows NT 3.1/4.0 STOP 0x0000007B?

Posted on 2019-06-04, 12:15

Perhaps that second esdi_506.pdr being loaded is for the secondary ATA(PI) controller? So in UniPCemu's case, the CD-ROM drive controller(except when there's no hard disks installed, in which case the CD-ROM drive controller becomes primary and there is no secondary controller). Could there be an …

Re: Windows NT 3.1/4.0 STOP 0x0000007B?

Posted on 2019-06-04, 05:35

Why would it think that the IDE CD-ROM is a harddisk? It only supports ATAPI mandatory commands, erroring out on any IDE commands, and displays as not ready/busy all the time, until it receives ATAPI commands? Anyone? Dosbox guys, does one of you know anything sbout Windows 95's CD-ROM driver and …

Re: Windows NT 3.1/4.0 STOP 0x0000007B?

Posted on 2019-06-04, 03:15

Just finished reinstalling Windows 95a. No notable difference spotted in the device detection: still two IDE HDD detections(including the CD-ROM drive). Perhaps better luck when the driver loads? It still crashes on the second driver esdi_506.pdr being loaded. But now I see what seems to be two …

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