Re: Searching for BIOS ROM dumps for ALR 286/386/ 486 board

Posted on 2024-04-25, 12:31

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello People of Vogons, I'm looking for the even and odd rom contents for this board: Advanced Logic Research with 386/486 "feature" slot. Model is ALR Powerflex PWB 7270 REV C. Probably other revisions have the same bios I'd assume. I appreciate your help. Hi! I've just got the same board with Q1 …

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Re: Arduino-based combinatorial PAL dumper

Posted on 2024-03-16, 15:52

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

A few updates to PAL Database: 1. MB Hyundai Super-16V Clone 2. VGA OTI037C_1037162003_REV_A 3. VGA OTI037C_1037164002_REV_D 4. VGA OTI037C_Hedaka_HED-622 All four has properly named pins in source files, so I even found an interesting additional use of this tool: a simple modification allowed to …

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22 ISA Adlib/CQM/OPL3-compatible soundcard comparison and tiny reviews

Posted on 2024-03-05, 19:51

by

by rpocc

in Marvin \ Sound

in Marvin \ Sound

Hi. Yes, I know that it's not the first thread of that kind, but I already have the data, so why not share it? WIth the first intention just to test all of my ISA cards on the subject of their value for sale and malfunction detection, I've got deep into a rabbit hole and made a comparison of …

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Re: AWE64 CQM issues

Posted on 2024-03-05, 00:11

by

by rpocc

in Marvin \ Sound

in Marvin \ Sound

There were also another half, which was completely unable to play these songs, performing a complete mess instead of that: Example of wrong sound. HARSH NOISE AND GLITCH INSIDE! That's exactly how my Aztech AZT2320 (integrated OPL3) sounded until I found this thread: https://www.vogons.org/ …

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Re: AWE64 CQM issues

Posted on 2024-03-04, 16:22

by

by rpocc

in Marvin \ Sound

in Marvin \ Sound

Weird that a driver would fix that problem. The FM functionality is just accessed directly through a port. Might have something to do with the timing. You're supposed to observe time delays before you write to OPL2 or OPL3 ports, and not all software does that, plus whether or not it causes …

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Re: AWE64 CQM issues

Posted on 2024-03-02, 10:37

by

by rpocc

in Marvin \ Sound

in Marvin \ Sound

Joseph_Joestar wrote on 2024-03-02, 10:02: If you're running pure MS-DOS 6.22 try these drivers. They might be newer than what you're currently using. For Win9x, download this driver CD. That disc originally shipped with CT4520 cards. Thank you, that helped, case closed!

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Re: AWE64 CQM issues

Posted on 2024-03-02, 09:37

by

by rpocc

in Marvin \ Sound

in Marvin \ Sound

To be more specific, here's the video with a short demonstration of this effect. Maybe something's wrong with my config.sys? (only common and SB-related lines are kept): DEVICE=C:\DOS\HIMEM.SYS /TESTMEM:OFF REM SB16 DEVICE=C:\PROGRAMS\CTCM\CTCM.EXE rem DEVICE=C:\DOS\EMM386.EXE NOEMS BUFFERS=15,0 …

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AWE64 CQM issues and OPL3 ATII compatibility questions

Posted on 2024-03-01, 17:26

by

by rpocc

in Marvin \ Sound

in Marvin \ Sound

UPD: Issue resolved, it was a bad or wrongly configured drivers UPD2: Mysteriously, a new issue appeared, see post 7 Maybe this question was asked many times before, but to my surprise I haven't found any discussion about sound differences between CQM sound specifically of AWE64 comparably to other …

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Re: Arduino-based combinatorial PAL dumper

Posted on 2024-03-01, 08:37

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The code was updated to version 1.3. Works stable with PAL16L8. It should support PAL20L8 as well, but all 3 chips I have to test are either registered or give doubtful results due to feedbacks (Paradise EGA board). Probably, in order to correclty support feedback configurations in auto mode, this …

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Re: Arduino-based combinatorial PAL dumper

Posted on 2024-02-25, 21:08

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Did you come across the "DUPAL" project? https://github.com/DuPAL-PAL-DUmper They also have a layout for a small PCB with the most common PAL / GAL sockets. I also support the idea of creating a how to and FAQ here so everybody can dump their PALs / GALS here just like in the BIOS threads. At the …

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Arduino-based combinatorial PAL dumper

Posted on 2024-02-25, 12:51

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi to all. Today I would like to introduce here my complete Arduino project: PALDump , version 1.0 1.3 Couple of weeks ago I was trying to revive one of my VGA cards, specifically Hedaka OTIVGA, which I've obtained with one of its PAL chips pulled off. I was struggling searching for an easy to build …

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Re: MOTHERBOARD 386SX EVEREX AGI METRO 386SX25 EV-18204 DAMAGED BY CORROSION. SOME COMPONENTES NEED REPLACEMENT

Posted on 2024-02-14, 10:16

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Whomever started with the suggestion of replacing the fuse with a 47 ohm resistor should check up on his knowledge of ohms law. Especially given the idea of a 100mA current draw (which seems appropriate for a keyboard). Please calculate the voltage drop that causes. I have to admit that I was …

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Re: MOTHERBOARD 386SX EVEREX AGI METRO 386SX25 EV-18204 DAMAGED BY CORROSION. SOME COMPONENTES NEED REPLACEMENT

Posted on 2024-02-12, 16:56

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I don't think you can replace the fuse with a 47 Ohm resistor. Use the original fuse if it is still good. What is the rationale here? If we are going to remove the protection just bodge it with 0R, what good would 47R do here? I don’t think the fuse in the keyboard powering circuit is a rational …

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Re: ROM for QD-6580 (KDE6500VLIDE)

Posted on 2024-02-08, 18:21

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've run across a couple cards that have a single large rom with split addressing. I've seen in it combo VGA/IDE controllers that display part of the rom in the VGA area and part of the rom elsewhere for int13. I've also seen caching IDE controllers that have a single rom that does both the Int 13 …

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Re: ROM for QD-6580 (KDE6500VLIDE)

Posted on 2024-02-08, 16:04

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Couple of notes about burning ROMs, chips, etc 1. In 74LS138P, the P just indicates the plastic DIP package. 2. Cloning many copies in a large chip is required only in one situation: when you have to install a chip of superior capacity with backward-compatible pin-out into a socket with the same …

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Re: 8-bit compatible ISA-16 Multi-I/O (and not only)

Posted on 2024-02-06, 07:28

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

With Trident 8900D cards, you need to set a variety of jumpers on the card itself to set it to 8-bit mode - it's not required for 8800CS, 8900B or 9000i-3 but I can't speak for other chipsets. Thanks, I've made a series of tests with couple of dozens various 9000B/C/I/I-1/I-3 cards and found out …

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8-bit compatible ISA-16 Multi-I/O (and not only)

Posted on 2024-02-05, 23:16

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Many retro-PC keen people are familiar with the Trident TVGA-series ISA16 VGA cards for their three jumpers enabling 8-bit compatible mode. Recently I’ve acquired an IBM PC/XT-compatible motherboard in working condition, saved from Armenian “precious metal extracting recyclers”. (Not sure how that …

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Re: Dead 486! Anyone able to repair what I can't?

Posted on 2024-02-01, 12:27

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I don't have experience with these POST cards so I maybe have a stupid question...is the last displayed code (07) the one trying to be tested (the card displays it at the beginning of the test), or the last one successfully tested (the card displays it at the end of the test)? I wonder if the …

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Re: MOTHERBOARD 386SX EVEREX AGI METRO 386SX25 EV-18204 DAMAGED BY CORROSION. SOME COMPONENTES NEED REPLACEMENT

Posted on 2024-02-01, 11:50

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

As you can see, there are three components labeled in the board as, FUSE1 (this is in good condition), BD1 (broken) and BD2? (broken) but the three are the same. BD1 and BD2 need to be replaced but I do not know which components they are, maybe inductors? but a fuse (FUSE1) is the same. FUSE1 can …

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Re: Retro PCs, internet connection sharing, safety

Posted on 2024-01-31, 15:57

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

EUR 60 gets you something (their hEX router) that can do WAN to LAN >1Gbps, IPSec >350Mbps and as complex a VLAN and firewall setup as you would wish to configure, and that in a tiny box the size of a pack of cigarettes that draws 5W. I use hEX as advanced smart switch with WOL scripts for remote …

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