Re: Drivers/Questions about ESS488

Posted on Today, 06:41

by

by mkarcher

in Marvin \ Sound

in Marvin \ Sound

Good to know! As for the cdrom port, could I just add an IDE cd-rom drive to it? Or would I have to stick it into the parallel port? No chance to get IDE drives running with that card. IDE drives use 16 data bits, and the card is an 8-bit card. As the CD-ROM port has 40 pins (like IDE), it might be …

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Re: MS-DOS 4.00 is now open source

Posted on Today, 06:28

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by mkarcher

in Marvin \ Software

in Marvin \ Software

Pretty cool. Looking forward to seeing 3.3 and 5.0 source also released someday. That will get us a really usable open source DOS. Maybe modern day assembly wizards can improve and optimize it. I suspect that Microsoft did not release the DOS versions that have the most commercial value on source, …

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Re: Working XTA (IDE on XT) setup on GLaBIOS

Posted on Today, 06:25

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by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It is pretty weird though, displaying it works, yet writing to file doesn't. I admit I don't know too much about the workings of debug. When you are writing to a drive using DMA (floppy drive on any kind of computer, hard drive on XTs), you rely on the source memory being addressable by DMA. …

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Re: Pentium PRO?

Posted on Yesterday, 17:33

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Technically it is possible for a VLB device to appear as a PCI one, by listening PCI conf mechanism accesses and responding to them as if it was a PCI device. This idea is similar to how the 3c509 can be set into EISA mode and configured using the ECU by listening to the EISA configuration …

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Re: Drivers/Questions about ESS488

Posted on 2024-04-25, 21:17

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by mkarcher

in Marvin \ Sound

in Marvin \ Sound

Sbdetect and hwinfo are helpful programs to have around, but they both give me A240 as the I/O port, different from what people here have been telling me. Any reason for this? Or just something to not worry about This means that you should shuffle the JP1 jumpers until they give you A220. A220 is …

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Re: Drivers/Questions about ESS488

Posted on 2024-04-24, 00:37

by

by mkarcher

in Marvin \ Sound

in Marvin \ Sound

Wow! Thanks for that! Should I redo the continuity without the jumpers? No need to do so. As I have enough experience with analyzing cards, I could easily deduce the effect of the jumpers. I just meant this as general hint if you want to practice to trace stuff this yourself, it's easier to …

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Re: Drivers/Questions about ESS488

Posted on 2024-04-23, 22:34

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by mkarcher

in Marvin \ Sound

in Marvin \ Sound

Alright! So I've tested the continuity and came back with a (probably) poor way of showing it. I don't know if I did this correctly? Let's see: Yellow: IRQ2 Green: DACK3 Cyan: DRQ3 Red: DACK1 Orange: DRQ1 Blue: IRQ7 Purple: IRQ5 Pinl: IRQ3 It would have made interpretation slightly easier for …

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Re: Cyrix appreciation thread

Posted on 2024-04-23, 18:06

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Vcc2 is the volage used for the processor core. 3.2v would put you beyond the Recommended Operating Condition but still within the Absolute Maximum Rating, so I guess it's a judgement call if you feel safe operating it that way. Just to point out what this means, so you can do the judgement …

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Re: Looking for help with analyzing disassembled code->

Posted on 2024-04-23, 14:36

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by mkarcher

in Milliways

in Milliways

Also, how I am going to figure out the application code if I don't know what C function's they're calling or what part of the binary is application code? As a DOS EXE file does not contain any kind of function name information, all names displayed by IDA (like _open or __dtoxmode ) are there …

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Re: Looking for help with analyzing disassembled code->

Posted on 2024-04-22, 20:05

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by mkarcher

in Milliways

in Milliways

Whether double or single underscores, I prefer to have at least some idea what a function does so I know whether or not it's worth paying attention to later on. It may very well turn out to be way too hard, but I'd like to try modifying Cartooners and see what I can make it do. I understand the …

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Re: SOYO 4SAW Mod BIOS

Posted on 2024-04-22, 19:54

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by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Do you perhaps have a VLB fix for the original BIOS? I've been looking for it forever. I just re-checked my around 7 years old notes about my 4SA (which should be identical to the 4SAW in that regard). The notes say that "the BIOS wrongfully configures the chipset to support a further PCI master …

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Re: Blown SMD components on Motherboard - any tips?

Posted on 2024-04-21, 22:54

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by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Cleaning out the solder from the holes first and cleaning up the flux etc did take off quite a lot of the brown solder mask. I guess it's a good idea to paint some more on? Is it the UV curable stuff I should use? If you don't need the property of the solder mask to be heat resistant and repel …

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Re: Additional RAM needed for my 486

Posted on 2024-04-21, 16:42

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by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Edit: Now that i think of it....i can leave two 8MB modules there so there would be 32 + 32 + 8 + 8 = 80MBs in total. Do you see any issues with such a non-standard combo? The mainboard will happily work with 80MB. The Intel 430 series is very flexible about memory addressing and does not prescribe …

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Re: An EIZO branded extended 8514/A compatible CAD/GUI accelerator: The AA41

Posted on 2024-04-21, 09:55

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by mkarcher

in Marvin \ Video

in Marvin \ Video

Further research revealed that I was wrong about the AA51 operating in 5-pixel nugget mode. While it is true that the AA51 supports 1280 x 1024, and it is also true that the 5-pixel-nugget mode of the C&T 82c480 has been specifically designed to support 1280 x 1024 with minimal overhead, that's not …

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Re: Cirrius Logic GD5428 on mainboard - RAM Ugrade

Posted on 2024-04-20, 17:33

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by mkarcher

in Marvin \ Video

in Marvin \ Video

You need to use exactly the same chip kind. That's a 256K x 16 Dual CAS Fast Page mode dynamic RAM for 5V supply in SOJ40 package If your onboard graphics currently only has one RAM chip, upgrading it from 512K to 1M makes a lot of sense, and it will also increase performance, as the memory bus will …

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Re: An EIZO branded extended 8514/A compatible CAD/GUI accelerator: The AA41

Posted on 2024-04-20, 16:22

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by mkarcher

in Marvin \ Video

in Marvin \ Video

Nice card, many thanks for sharing the drivers! Does it work? In an initial test, it worked perfectly. But that's just an initial test - the initialization code in the BIOS works, and GACONFIG works, including some diagnostics and a test screen. I tried to run AUTOCAD with that card booting from …

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Re: Corrupt characters with ELSA Winner 1000 EISA / ISA Graphics Card

Posted on 2024-04-19, 20:20

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by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Today the chips arrived - not the PCI version luckily. (Usually you can read that -P is the PCI version, but the -P version without "PCI" printing can be found on ISA, VLB and EISA cards.) The "PCI" just indicates that the chip support the PCI bus if it is strapped for PCI support . The datasheet …

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Re: Corrupt characters with ELSA Winner 1000 EISA / ISA Graphics Card

Posted on 2024-04-19, 18:56

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by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There seem to be certain rules at work, like when I type numbers: 0->0, 1->0, 2->0, 3->3, 4->4, 5->4, 6->4, 7->7, 8->8, 9->8..... Check for a short between video memory data bit 0 and 1. All the replacement patterns you quote have these two bits at the same level. As the '928 is a VRAM-based system …

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Re: Pentium PRO?

Posted on 2024-04-19, 06:50

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by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Agree with all the answers. There is something special about a P.Pro even though it is not optimized for 16bit OS it is superb in full 32bit OS compared to Pentium. Exactly. Intel never intended DOS / Win95 as target audience when they designed the Pentium Pro. The Pentium Pro was meant as "serious …

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Re: How to calculate Pixel Clock

Posted on 2024-04-19, 06:37

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by mkarcher

in Marvin \ Video

in Marvin \ Video

According to these specs, this is an attempt to calculate lower level details of the maximum the monitor can handle : *Maximum Pixels per line = Pixel Clock / Line Rate = 8000000 / 60000 = 1333.3333... *Maximum lines per frame = Line Rate / Frame Rate = 60000 / 75 = 800 These calculatons are …

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