Re: PicoGUS: ISA sound card emulator with Raspberry Pi Pico (Gravis Ultrasound, AdLib, MPU-401, Tandy, CMS)

Posted on 2023-06-07, 09:13

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by root42

in Marvin \ Sound

in Marvin \ Sound

just a quick question, can we use ESP-PSRAM64H instead of APS6404L-3SQR-SN , looks like pinout and specs are same. https://www.espressif.com/sites/default/files/documentation/esp-psram64_esp-psram64h_datasheet_en.pdf Looks very similar. However you would need the H variant because of the 3.3V …

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Re: Need help identifying this CGA card please!!

Posted on 2023-06-03, 08:46

by

by root42

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, 74 series logic has Vcc and GND always on the same pins. The in- and outputs should still look sensible. Even if you don’t know which IC in particular you are looking at. Hope is that it’s some other problem anyway. I would start somewhere, on one of the chips that you DO know what it is. And …

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Re: Need help identifying this CGA card please!!

Posted on 2023-06-02, 10:11

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by root42

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Gandalf 75 wrote on 2023-06-02, 10:09: I totally agree with you, however in order to troubleshoot the logic chips I would look at their data sheet, but how can I do so on ICs like these? True... that's somewhat annoying. EDIT: I can only find low res images on the web of this card, so no easy way …

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Re: Need help identifying this CGA card please!!

Posted on 2023-06-02, 10:02

by

by root42

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I unfortunately don't know which ones ARE the Ram ICs at this stage, as there are some ICs without any writing on them. I can sort-of guess that they are the ones that have specific common lines, but what if I'm wrong? The 4416 are the RAM Chips. However I would rather go a bit more systematically …

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Re: Vogons Video Announcement Thread

Posted on 2023-05-31, 06:17

by

by root42

in Milliways

in Milliways

Let's Code x86 Assembly: 0x08 Sizecoding Game Of Life WITH "MUSIC" https://youtu.be/noNhtyEKeb0

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Re: Platform games Amiga Style on PC??

Posted on 2023-04-08, 14:34

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by root42

in Marvin \ Software

in Marvin \ Software

What do you mean by platform? Platformers as in jump and run games? If that was meant: Gods by the Bitmap Brothers was available for both Amiga and PC. Similar with Zool and other games like that. The PC was lacking a lot in the scrolling and sprites department, but could make up for it once the …

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Re: VGA cards with little RAM (256KB): Why were they made in first place

Posted on 2023-04-04, 12:01

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by root42

in Marvin \ Video

in Marvin \ Video

That register bit for 512k interests me. Where did you read that?

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Re: Problems with Paradies HEGA IIIB in 200 lines modes

Posted on 2023-03-07, 11:11

by

by root42

in Marvin \ Video

in Marvin \ Video

Will do, will be a fun project! I do remember that I had troubles with that particular board in the past.

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Re: Problems with Paradies HEGA IIIB in 200 lines modes

Posted on 2023-03-06, 22:40

by

by root42

in Marvin \ Video

in Marvin \ Video

Identified the issue: this EGA card derives the clock for the 200 line modes from the ISA bus. And that is broken/iffy on my 286 board as I found out. My 486 drives the card without any issues.

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Re: Problems with Paradies HEGA IIIB in 200 lines modes

Posted on 2023-03-06, 16:04

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by root42

in Marvin \ Video

in Marvin \ Video

PS: Is there a manual for this card available? I can't find anything. there are 3 jumpers that I can set. The DIP switches seem to be rather obvious, although there is a 5th switch probably for autosensing the monitor type.

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Problems with Paradies HEGA IIIB in 200 lines modes

Posted on 2023-03-06, 15:58

by

by root42

in Marvin \ Video

in Marvin \ Video

I have a Paradise EGA card HEGA IIIB, which works mostly fine. Text mode and 640x350 works like a charm. Only games running in 200 line modes (320x200 or 640x200 show lots of noise and flashing green bars that race through the image. What could that be and how can I debug this? I have multimeter and …

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Re: EGA/VGA emulation on Hercules

Posted on 2023-01-31, 13:38

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by root42

in Milliways

in Milliways

Is it possible to make EGA's partial screen area pixels emulation? Is it possible to read A000~AFFF with TSR program without EGA card, and TSR copies A000~AFFFF to RAM, and copies that RAM address to Hercules card area? It would be even harder to just do that. EGA has something akin to bitplanes …

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Re: I built the AdLib reproduction card

Posted on 2023-01-02, 08:01

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by root42

in Marvin \ Sound

in Marvin \ Sound

Is there a genuine parts list to order parts from? In the project's README on https://github.com/schlae/adlib there's a link to a mouser basket root42 created. You need to find replacements for a number of resistors (as they're a minimum order of 200, at least now...) and the 74LS 245 logic IC, as …

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Re: PicoGUS: Gravis Ultrasound emulator on an ISA card with Raspberry Pi Pico

Posted on 2023-01-02, 08:00

by

by root42

in Marvin \ Sound

in Marvin \ Sound

Using the RP2040 directly sounds pretty neat. It would look more tidy then as well. Only thing that would be weird would be the DAC then, which will be a separate PCB. I still have to solder my PicoGUS. Should be the next assembly project. Maybe the DMA code is done by then. 😁

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Re: BLASTERBOARD : A new SB 2.0-compatible ISA sound card

Posted on 2022-12-29, 14:17

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by root42

in Marvin \ Sound

in Marvin \ Sound

My board has TI chips exclusively. Some look a bit tarnished, but I have that with brand new Mouser TI chips as well. It's the passivation layer I think. Filename IMG_3329.jpeg File size 1.32 MiB Views 591 views Filename IMG_3330.jpeg File size 1.47 MiB Views 591 views Filename IMG_3331.jpeg File …

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Re: Newly written driver(s) for Sierra's Creative Interpreter – Starting with Plantronics ColorPlus

Posted on 2022-12-29, 13:46

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by root42

in Marvin \ Video

in Marvin \ Video

There were different executables for different versions, but they supported multiple gfx-modes afaik. The EGA Version could be used the CGA,Hercules too and the the VGA256 supported ega-hires, but I am not 100% sure. The first part is definitely correct. And the latter is correct for Monkey 2 and …

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Re: BLASTERBOARD : A new SB 2.0-compatible ISA sound card

Posted on 2022-12-29, 13:45

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by root42

in Marvin \ Sound

in Marvin \ Sound

The rust looks like what you would get on old C64 MOS branded logic ICs. Bad or no passivation layer on the legs. When did NXP stop making 74 series logic? Maybe they did some crappy ones? The latest datasheet is from 2015: https://media.digikey.com/pdf/Data%20Sheets/NXP%20PDFs/74HC_HCT138_Rev5.pdf …

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Re: Vogons Video Announcement Thread

Posted on 2022-12-28, 22:22

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by root42

in Milliways

in Milliways

PC Speed: Atari ST Running MS DOS The Atari ST was one of multiple home computers of the 1980s that came out with the Motorola 68000 CPU. While very capable indeed it lacked compatibility with the ubiquitous IBM PCs and PC clones of the era. The Atari ST already supported the FAT file system, so you …

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Re: Vogons Video Announcement Thread

Posted on 2022-10-23, 20:52

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by root42

in Milliways

in Milliways

Let’s Code x86 Assembly: 0x07 Text Mode Plasma In this episode of our tour through the 8086 assembly language, we learn a few new opcodes and concepts CBW makes an appearance, as does the powerful XLAT for looking up values in … look-up tables! We use this to make a text mode plasma like effect. It …

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Re: GLX Player the only XT player ? Check Mod Master...

Posted on 2022-10-12, 07:49

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by root42

in Marvin \ Sound

in Marvin \ Sound

FreddyV wrote on 2022-10-07, 12:40: root42 wrote on 2022-10-06, 05:53: Can you please show the exact contents of the BLASTER variable? echo %BLASTER% I remember having the wrong or no T value a long time ago and ModMaster became a bit confused by that. T is no more used Thanks! Noted!

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