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

Posted on 2022-02-15, 20:57

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 …

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

Posted on 2022-02-14, 19:52

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 …

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

Posted on 2022-02-14, 19:50

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- …

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

Posted on 2022-02-14, 08:47

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 …

Re: My Emerson Elite SX386/16 Needs a New BIOS, But I Have Incomplete and Confusing Information About the Chipset and BI

Posted on 2022-02-10, 21:48

Very good, Deunan! ROM scanning is indeed Code 80 as also confirmed by my POST-card manual: Error Code – 80 AMI (80)Keyboard test started, clearing output buffer, checking for stuck key, About to issue keyboard reset command. About to give control to optional ROM in segment C800 to DE00. So I …

Re: My Emerson Elite SX386/16 Needs a New BIOS, But I Have Incomplete and Confusing Information About the Chipset and BI

Posted on 2022-02-10, 10:35

Unlikely...but maybe jdmcs can check: debug d c000:0 q I decrypted the whole image and the only text I see is: 386sx-BIOS (C) 1989 American Megatrends Inc. (C) 1991 Emerson Computer Corp. The BIOS-ID string is still unvisible...maybe it uses another encryption method. Dont know why AMI did this. …

Re: My Emerson Elite SX386/16 Needs a New BIOS, But I Have Incomplete and Confusing Information About the Chipset and BI

Posted on 2022-02-09, 23:14

Indeed, its only a part of the code where you can see the "55 AA" is checked and the size at [0002] is read. I didnt find the part where it is executed so far. Should be a "CALL FAR xxxx:3". But I am almost sure option ROMs are supported by the BIOS...see the screenshot at the top of the page. …

Re: My Emerson Elite SX386/16 Needs a New BIOS, But I Have Incomplete and Confusing Information About the Chipset and BI

Posted on 2022-02-09, 22:30

I took a closer look at your BIOS...just post my Notes here not to loose them ;-) 1st I NOPed out the checksum-checks for easier modification. These are For the Main BIOS: F000:81BE 7406 JZ 81C6 F000:81C0 BD0900 MOV BP,0009 F000:81C3 E9160C JMP 8DDC For the Diag-ROM: F000:937C 754A JNZ 93C8 With …

Re: My Emerson Elite SX386/16 Needs a New BIOS, But I Have Incomplete and Confusing Information About the Chipset and BI

Posted on 2022-02-09, 09:45

Also a good idea with the ROM size. However, in your screenshot I see the message.... Digital Research Technologies, Inc. DRBIOS 2000 v1.10 ....is displayed during inititialization. In jdmcs screenshot I dont see this. Therefore none of the ROMs is executed: Not the XT-IDE and not the Y2K. This …

Re: My Emerson Elite SX386/16 Needs a New BIOS, But I Have Incomplete and Confusing Information About the Chipset and BI

Posted on 2022-02-08, 07:53

I set the XT-IDE BIOS to D000 before doing this. It's the same image I programmed over lunch. What Debug Did.PNG It then tried to boot from C (which didn't exist as I don't have an IDE to CF adapter), then tried to boot from A (though I never heard the floppy drive), then finally the system …

Re: My Emerson Elite SX386/16 Needs a New BIOS, But I Have Incomplete and Confusing Information About the Chipset and BI

Posted on 2022-02-07, 20:15

OK, just tested with PCem: This is for testing if your ROM is OK: a call far D800:3 int 19 int 20 (enter) g q Then make a dump of your image: debug n xt.rom rcx 8000 w d800:0 q ....and upload the file xt.rom. Then: You have the 386 image. Why dont you start with the AT one?

Re: My Emerson Elite SX386/16 Needs a New BIOS, But I Have Incomplete and Confusing Information About the Chipset and BI

Posted on 2022-02-07, 13:48

Can you also check with debug if you can See the xtide? Your BIOS is a standard BIOS and - of course - it should support an option ROM. What ROM adress did you choose on your XT-IDE card? If you selected C800 you can take a look with debug... debug d c800:0 q ...if it is really there. If yes: We can …

Re: My Emerson Elite SX386/16 Needs a New BIOS, But I Have Incomplete and Confusing Information About the Chipset and BI

Posted on 2022-02-07, 10:11

I dont think the reason is your BIOS doesnt scan for option ROMs...and in case it doesnt, this would be an easy patch... Note the locaation of your ROM and test with debug.exe. In case its at D000 enter: debug d D000:0 q What is the output..? Also provide a dump of your current ROM, you can create …

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