Re: Sound Blaster Pro 2.0 high pitched whine when playing Midi files and buzzing when moving cursor in Windows 95

Posted on 2020-05-07, 09:25

by

by HanJammer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

CT1350B -> 286, 386SX CT1600 -> 386DX, early 486s SB16s (earlier) -> later 486s to early Pentiums SB16s (later) -> 486s to Pentiums AWE32 and later -> Pentiums Keep it like that (period correct), and you will minimize problems. Using CT1350B or CT1600 on Pentium machine (even for testing) seems a …

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Re: 486 with EGA? (and other EGA related questions)

Posted on 2020-05-06, 21:11

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by HanJammer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

- Many EGAs had composite output - comes in handy too. Yes? Which one? ;-) I have may EGA cards but these Cinch-Connectors are all "fake". None of them outputs a composite signal on it. I've never found an EGA card with a active composite output either. Don't the RCA connectors actually go to the …

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Re: MT-32 motherboard revisions?

Posted on 2020-05-04, 18:30

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by HanJammer

in MT-32 General

in MT-32 General

Complete cap kit is available here BTW: https://console5.com/store/roland-mt-32-mt32- … -kit-rev-1.html (it's for 01 but it should be virtually the same for 00).

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Re: MT-32 motherboard revisions?

Posted on 2020-05-04, 00:23

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by HanJammer

in MT-32 General

in MT-32 General

OTP ROMs were just cheaper. OTP EPROMs are identical to UV erasable EPROMs, just they don't have the window to let in UV light. The data will still be corrupted over time. Also it takes a long time for UV EPROMs with exposed window in direct sunlight to be "erased" (hours if not days) and I'm not …

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Re: MT-32 motherboard revisions?

Posted on 2020-05-03, 21:57

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by HanJammer

in MT-32 General

in MT-32 General

neither is more desireable than the other. mask roms just means you cant erase and reprogram them. I have an 00, it has 1.07. In this case, mask ROMs are definitely superior to EPROMs. The data stored in EPROMs will be corrupted over time. It takes seconds/minuets when exposed to UV light or …

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Commodore PC20-III - won't detect Commodore mouse port, when HDD is present...

Posted on 2020-05-03, 19:25

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by HanJammer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I thought the Frank'n'Mouse port on my PC20-III is broken until recently, when I started it without HDD connected... and it detected the mouse port :O Any idea what can cause such behaviour? BIOS version is 4.38 and motherboard revision is 6.2A Motherboard is very nice - It was removed from the case …

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Re: BIOS image collection - requests, discussion etc

Posted on 2020-05-02, 23:55

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by HanJammer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

#46 Manufacturer/Identifier: Wearnes CL286-12/16S (CL286-12S and CL286-16S) Chipset: Texas Instruments TACT822 / Micrel MIC921 BIOS/Version: AMI 080190 Rom Type : NMC27C256Q x 2 Nice ! I did not know Wearnes also marketed motherboards ! Had a CDROM back in early 90's that was a Wearnes. Looks like …

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Re: 80286 BIOS image collection

Posted on 2020-05-02, 23:33

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by HanJammer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

#46 Manufacturer/Identifier: Wearnes CL286-12/16S (CL286-12S and CL286-16S) Chipset: Texas Instruments TACT822 / Micrel MIC921 BIOS/Version: AMI 080190 Rom Type : NMC27C256Q x 2

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Re: BIOS image collection - requests, discussion etc

Posted on 2020-04-30, 11:32

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by HanJammer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes, I always use the external programmer, but this time I couldn't do that...

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Re: BIOS image collection - requests, discussion etc

Posted on 2020-04-30, 00:38

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by HanJammer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

#60 Board ID : Generic 386SX board (sometimes called HT18 Rev. 2.0) Chipset : Headland HT21A BIOS : Phoenix 07/28/91, on a 27C512 type ROM chip (64KB) ID string : You only copied half of the BIOS ! there are two ROMs. (And also you copied the first one as a 512kb rom, but it's a 256kb rom). Also I …

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Re: Why do 286 motherboards usually have two BIOS chips?

Posted on 2020-04-29, 01:17

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by HanJammer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Oh, but there are 286s with single BIOS EPROM! Also most older/cheaper 386 and 486 use a single 512k EPROM, and it's still 8-bit how about that? The answer is - single ROM in 286 needs multiplexing/demultiplexing which complicates things (a bit). Two ROMs do not need it. I would argue that it was …

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Re: My uncommon/epic MPC2 486 VLB build

Posted on 2020-04-28, 16:02

by

by HanJammer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

that's an interesting PAS16 "LMSI"... it doesn't have any of the LMSI components populated x3 also yes, alcohol and acrylic do not mix apparently, shouldn't be too hard to replace though, custom etched sounds nice, fill in the etched letters with white paint. very nice and clean build :3 So the …

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Re: My uncommon/epic MPC2 486 VLB build

Posted on 2020-04-23, 14:22

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by HanJammer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So I got the CD-ROM running. Possibly it was a missing jumper on the CD-ROM (strange, because it was working fine in Pentium machine) and bad contact of the cable connected to GUS (it presented the same behaviour with another CD-ROM).

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Re: SIS 486SOM Socket 3 System Board

Posted on 2020-04-23, 12:55

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by HanJammer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I saw a 486SOM board online. It's one of the late model PCI ones. I'm guessing it's made by Chaintech, cause the 486SPM looks similar. Any knowledge on this board? Are they easy to set up with an AMD 133MHz 486? http://www.recycledgoods.com/sis-486som-socket-3-system-board.html Yes, definitely …

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Re: My uncommon/epic MPC2 486 VLB build

Posted on 2020-04-23, 12:54

by

by HanJammer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah, I tried that, but it doesn't seem to save the settings - it says to use SHIFT+F5-8 keys to save and F5-8 keys to load (which I understand are just 4 mixer profiles), but when I save it under F5 for example, and then press F5 to load - it restores 'default' settings. Same if I set the mixer, …

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Re: My uncommon/epic MPC2 486 VLB build

Posted on 2020-04-23, 02:21

by

by HanJammer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It may be an OEM indeed. Some bus noises/hissing are audible on this card, but not to an extent present on SB16 from these years. I don't really need speaker out, because this case has built in amplifier anyway (not the best quality I guess, I will need to add some shielding to it, and maybe replace …

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Re: My uncommon/epic MPC2 486 VLB build

Posted on 2020-04-22, 19:15

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by HanJammer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes, I already asked the guy who made this kind of parts for my previous project for a price. I will fill it with paint or use transparent adhesive film for a laser printer and stick it to the back of non-etched window.

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My uncommon/epic MPC2 486 VLB build

Posted on 2020-04-22, 18:07

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by HanJammer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Corona virus epidemy forced me (like most of you) to stay at home most of the time, so I finally had time to build the project I had in mind for last year or so... The idea was to build 486DX2 VLB based MPC2 compliant rig from 93/94 - but instead of using regular common brands (Asus/Biostar/Shuttle/ …

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Re: Any info on this card (Promise (?) HLC-3000SP) needed

Posted on 2020-04-21, 21:44

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by HanJammer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks. I suspect it is some third party card, just chip and BIOS provided by Promise... Jumpers are unlike on their other cards and it doesn't have modes selected by jumpers - instead you select it during boot with a firmware menu.

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Any info on this card (Promise (?) HLC-3000SP) needed

Posted on 2020-04-21, 01:54

by

by HanJammer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I need any info (manual? drivers?) on this card. It's IDE controller with BIOS (although I'm not quite sure why it has one). I hoped it is EIDE but it doesn't seem to be the case. I have some problems with it in my 486 VLB build - it gives a choice of three modes on boot (Turbo which is default, …

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