Re: 80486 BIOS image collection

Posted on 2022-05-20, 20:03

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

#117 Manufacturer/Identifier: Chaintech 425SX/64K Chipset: BIOS/Version: SiS 85C401/402 [85C401, 85C402] https://www.ultimateretro.net/de/motherboards/1203 Filename 486_425SX-64K-F.zip File size 1.66 MiB Downloads 1 download Filename 486_425SX-64K-F.jpg File size 1.62 MiB Views 19 views Filename …

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Re: ASEM 3011 - 8086 - Jumper config

Posted on 2022-05-05, 08:36

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is this 8088 or 8086, cant see on your photos? For me it seems all tests are OK and it tries to boot - but it doesnt detect the floppy? I would try to insert a ROM-card, i.e. XT-IDE and verify its executed.

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Re: Bios for Citygate Harris 286 motherboard

Posted on 2022-04-21, 18:09

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Please upload a copy of your current BIOS. We can see if the checksum is OK and if yes try to get it running in PCem.

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Re: 80486 BIOS image collection

Posted on 2022-03-30, 20:49

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

#114 Board ID : QDI SIS 471 E DARK GREEN MAIN BOARD Chipset : SiS BIOS : ID string : Filename 486_AB7521006.jpg File size 1.23 MiB Views 128 views Filename 486_AB7521006.rar File size 1.28 MiB Downloads 7 downloads Filename 20220331_121420.jpg File size 276.1 KiB Views 108 views

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Re: Intertan DT-88 restoration (Late Tandy subsidiary 8088 clone)

Posted on 2022-03-10, 19:09

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Can you try this? I expect at least the clock to be working... Filename Set3e0.zip File size 5.35 KiB Downloads 4 downloads

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Re: Intertan DT-88 restoration (Late Tandy subsidiary 8088 clone)

Posted on 2022-03-09, 23:20

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think chances are high if you take a program like ATSETUP.COM and replace all references to port 70/71 with 03E0 / 03E1 you will get something useful as this seems to be the same RTC than in a AT with a different port?

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Re: Intertan DT-88 restoration (Late Tandy subsidiary 8088 clone)

Posted on 2022-03-09, 22:46

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So I am quite sure the sub at C538 is for reading data from CMOS (Port 03E0 / 03E1). The data to read is given in AL when it s called: F000:C51E BAE003 MOV DX,03E0 F000:C521 EE OUT DX,AL F000:C522 EB00 JMP C524 F000:C524 EB00 JMP C526 F000:C526 42 INC DX F000:C527 EC IN AL,DX F000:C528 C3 RET F000: …

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Re: Intertan DT-88 restoration (Late Tandy subsidiary 8088 clone)

Posted on 2022-03-08, 21:32

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Indeed, I noticed my mistake as I noticed my screenshot above: In the dump there is always the english message and next to it the identical one in french. Both are printed... Shadow in a Xt..? Dont think so. Maybe A000 is the location of the 2nd ROM socket. But thats where the VGA-RAM should be... …

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Re: Intertan DT-88 restoration (Late Tandy subsidiary 8088 clone)

Posted on 2022-03-08, 21:14

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I took a look at the BIOS...: At the beginning it does this: F000:E015 BB00A0 MOV BX,A000 F000:E018 8EDB MOV DS,BX F000:E01A 32FF XOR BH,BH F000:E01C 813F55AA CMP WORD PTR [BX],AA55 F000:E020 7406 JZ E028 F000:E022 813F4D46 CMP WORD PTR [BX],464D F000:E026 7505 JNZ E02D F000:E028 EA080000A0 JMP A000 …

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Re: Intertan DT-88 restoration (Late Tandy subsidiary 8088 clone)

Posted on 2022-03-05, 23:12

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So you can boot DOS from floppy and access the hard disk as C:? Adding a XT-IDE Bios on a network card should fix this? I am not sure if the CMOS setup is really implemented in the BIOS. Yes, the strings are visible. I will try to check this. But you can also see "720 KB 3?", 1.44 MB 3?", Not …

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Re: Intertan DT-88 restoration (Late Tandy subsidiary 8088 clone)

Posted on 2022-03-05, 22:53

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I took a look at the dump. The 1st half is a Video ROM. The 2nd half is the system BIOS. It runs in PCem in the "Atari PC3" machine. It loads XT-IDE but doesen detect a HD (this should be fixable on a real PC..). It boots DOS from floppy. So whats the issue you actually have? Doesnt your PC boot at …

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Re: Intertan DT-88 restoration (Late Tandy subsidiary 8088 clone)

Posted on 2022-03-04, 21:34

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Can you post a dump of the BIOS? Would like to take a look at it.

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Re: 80286 BIOS image collection

Posted on 2022-02-26, 20:09

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

#: 78 Manufacturer/Identifier: Plantron Chipset: Headland GC101A-PC GC113-PC G2 GC102-PC BIOS/Version: Filename 286_Plantron.jpg File size 1.03 MiB Views 206 views Filename 286_Plantron.rar File size 1.51 MiB Downloads 12 downloads

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Re: Enhanced color graphics II - Compaq Deskpro 286 EGA card

Posted on 2022-02-21, 19:58

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes, it has some erros in text mode with 640 pixels buts its readable. In graphics mode 320x200 its 100% accurate and playable. The scrolling artifacts you noticed are related to Commander Keen and are well known. But you need a fast PC. Whatever, there is no cheaper way to get a EGA picture on your …

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Re: Enhanced color graphics II - Compaq Deskpro 286 EGA card

Posted on 2022-02-21, 19:03

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Nice card! Invest 6€ in a logic analyzer to see the picture 😉 https://www.youtube.com/watch?v=PPi47e0SOUg https://www.youtube.com/watch?v=FvCjBuS9NBc&t=1s 6€ MCE2VGA replacement - CGA/EGA/HGC capture with logic analyzer

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Re: ISA XMS/EMS Memory Extension / Expansion cards: Now Running without Driver / Documentation :-)

Posted on 2022-02-15, 20:57

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Unfortunately my card currently refueses to work. The RAM get very hot and nothing is detected. On the back there seems to be some kind of factory repair. All of the chips get hot? These are NMOS but not that power-hungry, datasheet says each chip is about 30mW in standby. Perhaps the driving logic …

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Re: ISA XMS/EMS Memory Extension / Expansion cards: Now Running without Driver / Documentation :-)

Posted on 2022-02-14, 19:52

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The card uses some very special RAM modules I have never seen before. On the top there is a normal 30-pin SIMM for comparision. IMG_9210r.jpg NEC MC-41256A4A-15 8632KD NEC MC-41256A5A-12 8625KD Unfortunately my card currently refueses to work. The RAM get very hot and nothing is detected. On the …

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Re: ISA XMS/EMS Memory Extension / Expansion cards: Now Running without Driver / Documentation :-)

Posted on 2022-02-14, 19:50

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Back to topic...next card I got is a NCR one. Its is labeled NCR -85 017-0035806 ASSY 017-0035447 D SCHM 017-0035448 B IMG_9207r.jpg IMG_9208r.jpg User GuillermoXT from dosreloaded.de owns this card, too. He uploaded a manual. https://dosreloaded.de/forum/index.php?thread/3489-tandon-target-40-286- …

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Re: ISA XMS/EMS Memory Extension / Expansion cards: Now Running without Driver / Documentation :-)

Posted on 2022-02-14, 08:47

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

No, the RAM is not copied/transferred to another location, therefore there is no DMA. These cards are intended for use in 286 systems. There are usually other bottlenecks than the speed of the XMS. But yes, these cards are slow. You can already see in in the POST screen when RAM counts. The 1st part …

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Re: ISA XMS/EMS Memory Extension / Expansion cards: Now Running without Driver / Documentation :-)

Posted on 2022-02-14, 08:25

by

by Predator99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Its new to me cachechk runs on a 286? If yes, I can try if I have a board installed next time. For me it makes totally sense the RAM on the card (connected via ISA bus) is slower than the onboard RAM (connected direclty to CPU).

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