Re: Area 5150: New IBM PC+CGA demo

Posted on 2022-08-22, 12:22

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by Tronix

in Release Announcements

in Release Announcements

Is that snow static, or does it flicker? A small video might be nice. Something like this: https://youtu.be/0ivcM-2TK4w Also: where die you get the CGA Redux card from? Looks neat! Would love to build something like that! CGA Redux is open source project found here: https://github.com/hkzlab/CGA_ …

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Re: Area 5150: New IBM PC+CGA demo

Posted on 2022-08-22, 09:35

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by Tronix

in Release Announcements

in Release Announcements

ViTi95 wrote on 2022-08-22, 08:23: Well right now FastDoom supports the 160x100 CGA 16 color mode, and it's pretty fast Hi there, when i tried fdoomc16 on newly made CGA (CGA Redux) i got a lot of "cga snow" unfortunately... Sorry for offtopic Spoiler Filename photo_2022-08-21_22-17-38.jpg File …

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Re: XT clone motherboard repair advice/help needed (Jaton JXM-1003 / JXM-JET 88-V2)

Posted on 2022-08-03, 07:20

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by Tronix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think the generation of addr.8 and addr.9 signals or RAM should look like this: Briliance, SSTV2 , your code worked perfectly. I did it wrong before. Thank you very much! Now final PLD equations look like this: CS1 = !( !MEMR & !A13_A14 & A15 & A16 & A17 & A18 & A19 & DACK ); CS2 = !( !MEMR & A13 …

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Re: XT clone motherboard repair advice/help needed (Jaton JXM-1003 / JXM-JET 88-V2)

Posted on 2022-08-02, 16:02

by

by Tronix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Great job! I think the generation of addr.8 and addr.9 signals or RAM should look like this: ...skip... Thank you. In accordance with this scheme (from scaned paper book), yes, it should look something like this, and I did something like this before, but this did not allow any programs to load. But …

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Re: XT clone motherboard repair advice/help needed (Jaton JXM-1003 / JXM-JET 88-V2)

Posted on 2022-08-02, 14:45

by

by Tronix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

PTherapist wrote on 2022-08-02, 14:24: Can this read PAL chips, as I don't see anything listed in the program? I don't know, probably not. Thanks anyway.

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Re: XT clone motherboard repair advice/help needed (Jaton JXM-1003 / JXM-JET 88-V2)

Posted on 2022-08-02, 13:23

by

by Tronix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

When you had 4x 256K chips installed, did the boot memory test mention the remaining 384K at all (might be certain BIOS version specific)? I have this same motherboard and with the 4 chips it shows 640KB + "384KB Virtual" at boot. No, i don't see "384KB Virtual" at boot screen. I dumped bios from …

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Re: XT clone motherboard repair advice/help needed (Jaton JXM-1003 / JXM-JET 88-V2)

Posted on 2022-08-02, 12:52

by

by Tronix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Amazing work Tronix ! Thanks. I was looking at the photo of the board and the photo of the board in the other vogons thread and was wondering What use have U6, RP5 and U9 since they still seem to be missing on the photo of your board, while present on the photo of the other thread. I don't know for …

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Re: XT clone motherboard repair advice/help needed (Jaton JXM-1003 / JXM-JET 88-V2)

Posted on 2022-08-02, 07:09

by

by Tronix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks for your answering, SSTV2 ! Lets assume that memory map is as follows: FE000 - FFFFF 8KB BIOS ROM F6000 - FDFFF 32KB BASIC ROM That's right! For some reason I thought that FE000 - FFFFF 8K BIOS ROM and F8000 - FFFFF 32K BIOS ROM. I forgot about BASIC and thought it was just two different …

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XT clone motherboard repair advice/help needed (Jaton JXM-1003 / JXM-JET 88-V2)

Posted on 2022-08-01, 06:08

by

by Tronix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello, I recently got this motherboard (photo by seller): ezgif.com-gif-maker.jpg I identified the board as Jaton JXM-1003 aka JXM-JET 88-V2 and found some jumper info here: https://www.vogons.org/viewtopic.php?p=909010#p909010 As you can see, the board is missing: power connector, keyboard …

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Re: DxDiag - illegal operation

Posted on 2022-02-16, 13:54

by

by Tronix

in Marvin \ Software

in Marvin \ Software

Not at all! BTW, the same method worked with some other 3D applications on 80486, for ex Final Reality demo/benchmark - app crashes on library RLMFC.DLL, so if you replace 0x0f 0x31 bytes to 0x90 0x90 in RLCMFC.DLL Final Reality start okay, excluding CPU frequency info.

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Re: DxDiag - illegal operation

Posted on 2022-02-13, 13:47

by

by Tronix

in Marvin \ Software

in Marvin \ Software

Chadti99 wrote on 2022-02-13, 13:19: Any chance you could share your modified file? No, sorry, i'm not sure that I will not violate the Microsoft license agreement or forum rules. You can use any hex editor to replace all 0x0f 0x31 bytes to 0x90 0x90 bytes in DXDIAG.EXE file.

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Re: DxDiag - illegal operation

Posted on 2022-02-13, 12:56

by

by Tronix

in Marvin \ Software

in Marvin \ Software

I encountered similar DXDIAG behavior when i run it on 486 computer. In my case, CS:EIP points to this code: https://habrastorage.org/webt/f6/au/vw/f6auvwurrfjd1qrzbj6hlae1cfw.png From which it follows that everything stops at instruction RDTSC, which is not supported by the 486 processor. However, …

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Re: CGA text mode emu - Run your favorite CGA game in 80x50 text mode

Posted on 2022-01-07, 09:52

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by Tronix

in Release Announcements

in Release Announcements

Using half width characters you can double the resolution vertically or horizontally (80x100, or 160x50), maybe it makes the screen look better. It will be a little bit slower, but for sure will look better! I am using half-width and half-tall characters together (ascii 220 and 221). The same …

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CGA text mode emu - Run your favorite CGA game in 80x50 text mode

Posted on 2022-01-07, 09:13

by

by Tronix

in Release Announcements

in Release Announcements

We have recently made a new ISA8 video card based on the old element base (triple intel 8275 CRT controllers), which can work only in text modes. If anyone is interested, here are photos https://i.ibb.co/9m0ycGZ/P1140039.jpg https://i.ibb.co/KWsP0SQ/P1140040.jpg Since this video card works only in …

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Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2022-01-01, 10:53

by

by Tronix

in Release Announcements

in Release Announcements

Hi, Does mode 80x50 have no mistake here? textdestscreen += 4128; #if defined(MODE_T8050) || defined(MODE_T80100) // Change video page regs.h.ah = 0x05; regs.h.al = textpage; regs.h.bh = 0x00; regs.h.bl = 0x00; int386(0x10, ®s, ®s); textdestscreen += 4096; //4128 textpage++; if (textpage == 3) …

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Identify OLD terminal 8088 board (presumably Bull Questar 210)

Posted on 2021-11-23, 08:17

by

by Tronix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello, i have old terminal board (just a board and nothing else): BULL S.A CARTE LA2.1 290 108-00A NEP-14T https://hsto.org/files/d60/460/9cf/d604609cf93b4777b9d3c858c7673a19.jpg I replace broken LED1 and LED2, traced the main power circuits and made a pinout of the blue connector J4: https:// …

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Re: New processors for old sockets.

Posted on 2021-11-13, 17:43

by

by Tronix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

BTW, [Jürgen] made his 65f02 CPU running at 100 MHz for direct replacement original MOS 6502 http://www.e-basteln.de/computing/65f02/65f02/

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Re: What retro activity did you get up to today?

Posted on 2021-03-26, 16:59

by

by Tronix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Soldered Triple-Head i8275 VGA ISA8 board by freddy. Filename P1130930.JPG File size 749.08 KiB Views 1754 views Filename P1130932.JPG File size 1001.47 KiB Views 1754 views Filename P1130936.JPG File size 1.09 MiB Views 1754 views Filename P1130942.JPG File size 656.54 KiB Views 1754 views

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Re: SAA1099 as 4-bit DAC and CMS/GameBlaster digital sound output

Posted on 2021-03-14, 09:45

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by Tronix

in Marvin \ Sound

in Marvin \ Sound

I completely forgot about the ImpulseTracker! This is an excellent music tracker, the source code of which is open, so I can easy make support for CMS/GameBlaster output now. I again took the driver for audio output on LPT Covox as a basis and changed it a little. As a result, we got the CMS.DRV …

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Re: SAA1099 as 4-bit DAC and CMS/GameBlaster digital sound output

Posted on 2021-03-14, 05:54

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by Tronix

in Marvin \ Sound

in Marvin \ Sound

Just curious, how large are the .wav files you played, and what are the rest of the specs of the computer you did this on? I wonder how slow of a PC could actually handle this. I am very lazy to write my own player for WAV files, so I took someone's ready-made code in Turbo Pascal and changed the …

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