Re: DOOM sounds terrible on my new SC55 - why?

Posted on 2018-08-23, 23:03

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by AppleDash

in Marvin \ Sound

in Marvin \ Sound

Thanks for the suggestions - as usual, I solved the problem on my own within hours of posting this thread. I was using a Sound Blaster 32 PnP, and it was somehow conflicting with the HardMPU. I could not find a jumper on the board to disable the built in MPU emulation on the Sound Blaster, and I …

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DOOM sounds terrible on my new SC55 - why?

Posted on 2018-08-23, 01:06

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by AppleDash

in Marvin \ Sound

in Marvin \ Sound

I just purchased an SC55 on eBay from Japan that claims to be tested in working condition. It powers on fine, and when I got it I reset it to factory settings just to be safe. I am using a HardMPU card ( https://i.ebayimg.com/images/g/WrIAAOSwwGdZ0BCt/s-l1600.jpg ) with the default jumper settings, …

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Re: SuperDisk (LS-120) drive being very weird under DOS - help?

Posted on 2018-08-02, 21:03

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by AppleDash

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Are you using the DOS FORMAT utility or something else? My guess is that it's writing bogus disk geometry data for some reason. Without investigating further, a quick fix for this issue would probably be to get a disk image of a "normal" disk, and then when you get one of these weird ones just …

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SuperDisk (LS-120) drive being very weird under DOS - help?

Posted on 2018-08-02, 19:34

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by AppleDash

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I recently obtained a SuperDisk drive as well as a Promise FloppyMax LS-120 controller ISA card for my 486. I installed the card and the drive with the configuration appropriate to replace the normal A: drive with the SuperDisk drive (the only configuration needed that the manual states is that I …

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Re: 8088 from a bunch of random parts - nothing but a blinking cursor. What's wrong?

Posted on 2018-06-03, 06:04

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by AppleDash

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It works! I managed to boot from the IBM XT utilities floppy and perform a low-level format on the drive. The error is gone and the drive works.

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Re: 8088 from a bunch of random parts - nothing but a blinking cursor. What's wrong?

Posted on 2018-06-02, 07:52

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by AppleDash

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

1701 is a HDD controller error, as per the info on this link: http://minuszerodegrees.net/5150_5160/hdd/1701_possibilities.htm You say you tested that HDD on another system, was it tested with the same HDD controller? If not, it's possible that the controller doesn't like the ST-412 or something …

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Re: 8088 from a bunch of random parts - nothing but a blinking cursor. What's wrong?

Posted on 2018-06-02, 07:14

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by AppleDash

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Exciting little update... When I have the HDD controller (IBM 1816101) and HDD (ST-412, tested good in another system) present, I get a 1701 error and then the system hangs. When I remove the HDD controller and leave just the floppy controller, it gives me the standard expected "Insert a disk in …

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Re: 8088 from a bunch of random parts - nothing but a blinking cursor. What's wrong?

Posted on 2018-05-27, 20:05

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by AppleDash

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Incidentally, are you sure that is a CGA card and not an EGA card? I don't think I have ever seen a CGA with the two RCA jacks on it. I believe monochrome and EGA use the same dip setting, but I could be wrong. Also, is that not the same XT board Red Hill talks about? EDIT: Nope, Google says CGA. I …

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Re: 8088 from a bunch of random parts - nothing but a blinking cursor. What's wrong?

Posted on 2018-05-27, 19:17

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by AppleDash

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Another explanation could be that it is not configured correctly. XTs generally have jumpers or dip switches on the motherboard to select between mono and color display adapters. In this case, probably the blue block of switches (that is the same as on a real IBM XT, so chances are they also work …

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Re: 8088 from a bunch of random parts - nothing but a blinking cursor. What's wrong?

Posted on 2018-05-27, 09:33

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by AppleDash

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

As stated, when I power on the system, all I get is a blinking cursor in the upper left corner of the monitor. Any ideas what I'm doing wrong? And... if anyone could help me identify the unknown parts, that would be great! You probably did nothing wrong apart from not showing enough patience. The …

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Re: 8086 from a bunch of random parts - nothing but a blinking cursor. What's wrong?

Posted on 2018-05-27, 08:23

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by AppleDash

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

did you reseat and clean all socketed ic's ? I have not, but I will do now. xt computer here the motherboard manual http://arvutimuuseum.ee/th99/m/U-Z/31541.htm I have one same https://imgur.com/qIFPPsW Awesome, thanks. Although the picture is blurry, I am guessing it should be an 8088 board, as an …

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8088 from a bunch of random parts - nothing but a blinking cursor. What's wrong?

Posted on 2018-05-27, 04:28

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by AppleDash

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've had a bunch of 8088 system parts in my collection for awhile, dismantled from various untested systems or otherwise acquired in uncertain condition. Today, I decided to try and make a working system out of them, mainly because I want a system that uses CGA instead of VGA. The components I am …

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Re: Socket 7 board having trouble with second drive.

Posted on 2017-04-21, 10:45

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by AppleDash

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm using OSR 2.5. I haven't done anything to the Fujitsu drive - I'll try sticking it in the system it works on and giving it a new FAT32 filesystem and seeing if that helps.

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Re: Socket 7 board having trouble with second drive.

Posted on 2017-04-18, 14:47

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by AppleDash

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The HDD is not faulty. This happens with many drives, and this particular drive works 100% fine on a newer system. In addition, the BIOS calculates the wrong size for the drive if I manually enter in the right CHS values. I can do this without the drive even being *connected*, so this wrong …

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Re: Socket 7 board having trouble with second drive.

Posted on 2017-04-18, 13:36

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by AppleDash

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The drive is never correctly detected on the socket 7 system - it is always detected wrong Compare its geometry given on HDD case (CHS) with geometry that is being detected in BIOS, if numbers do match, then it's detected correctly at this point. auto-detect on POST sees the drive but Windows hangs …

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Re: Where to find old cases?

Posted on 2017-04-18, 13:21

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by AppleDash

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Unfortunately, there's no USB to floppy adapter that just makes it show up as a regular drive. They all require special Windows software and are really only intended for archiving old disks.

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Re: Socket 7 board having trouble with second drive.

Posted on 2017-04-18, 11:56

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by AppleDash

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The drive is never correctly detected on the socket 7 system - it is always detected wrong, and auto-detect on POST sees the drive but Windows hangs with the drive present. I've tried all jumper settings, and as it is now they are properly configured. The PIO thing is interesting - I didn't consider …

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Re: Socket 7 board having trouble with second drive.

Posted on 2017-04-17, 12:42

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by AppleDash

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Small one is a WD, large is a Fujitsu. Why would the brand and channels matter? Also, when I had just the large as the only drive as the primary master, it didn't detect it properly either - it showed as like 1GB in the BIOS but DOS/Windows installer only saw it as 200MB or so.

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Socket 7 board having trouble with second drive.

Posted on 2017-04-17, 12:10

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by AppleDash

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hey there, I have a socket 7 motherboard with Award BIOS (Pretty sure it's this one: http://arvutimuuseum.ee/th99/m/P-R/33984.htm ). For some reason I can only get it to properly detect a 528MB drive (have one as the primary) - when I enter the CHS values from a bigger (secondary) drive, it just …

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Re: VLB 486 memory weirdness

Posted on 2017-04-16, 11:26

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by AppleDash

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've tried with 2 different known-good PSUs. There's no useful information on the POST screen I'm afraid 🙁

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