Re: 386DX/40: How far can I take this?

Posted on 2021-11-27, 02:24

by

by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There's not a lot more you can do with this system. Your SXL-40 actually supports clock doubling just like the SXL2. But it doesn't help you much if you want a 33 or 40MHz bus. These 5V SXL chips top out around 55MHz if you're lucky. You probably could get it to run at 50 with a heatsink though. …

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386DX/40: How far can I take this?

Posted on 2021-11-27, 00:09

by

by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I pose that question in the title of this post because that is exactly what I asked myself the first day I got this computer in November 2020. I did set one limit on this in that there would be no modifications to the motherboard itself. The motherboard is a Biostar MB-1340MKA-F with a MACRONIX …

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Tandy 1000 TX dual monitor setup TGA + Hercules

Posted on 2021-11-21, 03:18

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by jasa1063

in Marvin \ Video

in Marvin \ Video

I decided to see how well a dual monitor setup with a Hercules graphics card would work in my Tandy 1000 TX. I am glad to say all worked well with no surprises. Setting motherboard dip switch 1 on will make the onboard TGA the primary and setting it off will make the Hercules card the primary video. …

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Re: Multi I/O card identification

Posted on 2021-11-17, 03:38

by

by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I am having trouble finding the jumper settings for this Multi I/O card. I found a PM540 on stason.org, but this is a PM540 G. Any help would be appreciated:) https://www.elhvb.com/iocard/PM540G.txt https://stason.org/TULARC/pc/hard-disk-floppy-controllers/U-Z/UNIDENTIFIED-Two-IDE-AT-Interface- …

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Multi I/O card identification

Posted on 2021-11-17, 03:10

by

by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I am having trouble finding the jumper settings for this Multi I/O card. I found a PM540 on stason.org, but this is a PM540 G. Any help would be appreciated:)

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Re: Northgate 386DX/25 w/Omnikey 102 keyboard

Posted on 2021-11-16, 01:45

by

by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Wow, your timing was perfect, those keyboards sold out FAST once they were put in the store, I think we had one left in the back room that just went last week out of a batch of 4-5 that were donated. Are you also on the FGTC Discord or was it random luck that you happened in at the right time? …

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Re: Northgate 386DX/25 w/Omnikey 102 keyboard

Posted on 2021-11-14, 18:58

by

by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

A few more pictures.

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Northgate 386DX/25 w/Omnikey 102 keyboard

Posted on 2021-11-14, 18:57

by

by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I lived in Bloomington, MN from 1988-2011. There was a Northgate computer outlet store just a few miles down the road from me. My first 386 computer was a Northgate 386DX/20 I got in 1990. I have always wanted to recreate the experience of having a Northgate 386 and matching Omnikey keyboard. I got …

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Re: XT-IDE on an AT clone: should this work?

Posted on 2021-11-14, 01:27

by

by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have run a XTIDE with a compact flash on a 386sx with no problem. Both through a Blue Lava Systems XTIDE adapter with built in Compact Flash and using an XTIDE BIOS and a regular IDE internface. I had no problems with either one.

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Re: Northgate Omnikey 102 missing badge replacement

Posted on 2021-11-14, 01:08

by

by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I reached out to Robert Tibbetts who is well known for his repairing of Northgate Omnikey keyboards. He was able to supply me with a reproduction label that I just had to trim to fit the my Northgate Omnikey 102 keyboard. Here is the result.

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AST Adventure! Advantage 6060P Socket 4 System w/Pentium Overdrive 133 (PODP5V133)

Posted on 2021-11-13, 17:01

by

by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Earlier this year I made a Craigslist purchase for what I thought was going to be a 486 Pentium Overdrive 83MHz (PODP5V83). When I finally met the gentleman, what he had was a Pentium Overdrive 120/133 for a Socket 4 (PODP5V133). The asking price was only $15 so I made out much better than I thought …

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Northgate Omnikey 102 missing badge replacement

Posted on 2021-11-01, 03:22

by

by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I was lucky enough to a Northgate Omnikey 102 keyboard in really good condition, but the Northgate logo badge is missing. Does anyone know a source for a replacement?

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Re: ATI VGA Wonder XL24 stuck at 640x480

Posted on 2021-10-17, 20:11

by

by jasa1063

in Marvin \ Video

in Marvin \ Video

I did some further testing on the computer that is having issues. On initial power on, it is not detecting the monitor properly. Doing CTRL+ALT+Delete and after that reboot the monitor is recognized properly and all video modes are available again. I am still doing more testing, but at least I have …

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Re: ATI VGA Wonder XL24 stuck at 640x480

Posted on 2021-10-17, 16:38

by

by jasa1063

in Marvin \ Video

in Marvin \ Video

I tried in a different computer with an HP 17" LCD and what do you, it's now working!

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ATI VGA Wonder XL24 stuck at 640x480

Posted on 2021-10-17, 01:17

by

by jasa1063

in Marvin \ Video

in Marvin \ Video

I picked up an ATI VGA Wonder XL24. I have used the VINSTALL utility to try and set the monitor type, but the adapter refuses to set any modes above 640x480. When using VINSTALL to try and do diagnostics 640x480 is the highest resolution available. I have also tried to set custom resolutions and it …

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Re: ATI Small Wonder technical info

Posted on 2021-09-29, 00:08

by

by jasa1063

in Marvin \ Video

in Marvin \ Video

Years ago as part of GRAFIX the Tandy 1000 graphics and sound package I created. I wrote a BIOS support TSR called Tandy11 for the Tandy 1000/SL/SL2/TL/TL2/TL3/RL 640x200x16 color graphics mode and it included video mode set and character output routines. I might be able to adapt that for the ATI …

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Re: ATI Small Wonder technical info

Posted on 2021-09-28, 15:52

by

by jasa1063

in Marvin \ Video

in Marvin \ Video

Thanks to everyone for pointing me in the right direction:)

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ATI Small Wonder technical info

Posted on 2021-09-28, 02:44

by

by jasa1063

in Marvin \ Video

in Marvin \ Video

I acquired an ATI Small Wonder revision 1 video card. I was able to find the owners manual and software diskette. I am looking for technical info on programming the 640x200x16 color graphics mode and the Plantronics ColorPlus 320x200x16 graphics mode. Are there any good resources out there on this …

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Re: RTC not updating date & time when computer is turned off

Posted on 2021-09-15, 02:14

by

by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I removed the coin cell battery and rigged up an external 4.5v battery today. The time is now updating normally with the computer turned off. I am just relieved to know that there is no damage to the motherboard as far as the RTC is concerned.

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Re: 486DLC/TI486SXL interposer board for cache coherency

Posted on 2021-09-14, 15:52

by

by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I noticed how fragile the pins were and decided to removed the interposer. I just enabled the FLUSH input and the 486DLC works fine on it's own. I am just going to hold onto the interposer for now.

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