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Re: EXCELGRAPH - ISA Video Display Controller (ET4000/W32i)

Posted on 2024-04-05, 03:30

in Marvin \ Video

in Marvin \ Video

...I am glad to see activity on the project! I haven't read the previous pages but I get that you want to try lower speed DRAM chips. That might actually be a solution and they might work without hassles. The original TSENG datasheet requests for 45-50 ns DRAM ICs, as far as I remember. Looking at …

Re: EXCELGRAPH - ISA Video Display Controller (ET4000/W32i)

Posted on 2024-04-03, 00:40

in Marvin \ Video

in Marvin \ Video

If you just want to get highest DOOM or Quake 360x480 scores, and do not care about SVGA speed / operation, bank interleaving is likely not required at all, and you could just go with just 1MB in two 256k x 16 chips. As you only have a single bank, you will probably get away with using EDO chips as …

Re: EXCELGRAPH - ISA Video Display Controller (ET4000/W32i)

Posted on 2024-04-02, 04:01

in Marvin \ Video

in Marvin \ Video

I was just able to grab 3 W32I chips for a really good price. About $20 each, shipping inclusive. I'm looking to put together a modified version of these cards with a marginally lower chip count. I'd effectively be redoing the layout of most of the card and layout from scratch, and I'm thinking of …

Re: Artifacts/dots on 0ws Orchid Prodesigner IIs, DRAM not the issue

Posted on 2024-02-23, 07:31

in Marvin \ Video

in Marvin \ Video

Bumping again. Running WHATVGA and similar artifacts appears where the test palette is loaded in the respective test image This only happens in the "Phase Two" (where the test image extends off of the display area) of Modes: 0025h (640:480:16 Planar) 0029h (800:600:16 Planar) 0037h (1024:768:16 …

Re: Artifacts/dots on 0ws Orchid Prodesigner IIs, DRAM not the issue

Posted on 2024-01-27, 07:20

in Marvin \ Video

in Marvin \ Video

DSC_4973.jpg Ran PALANIM and this was the result. It's nowhere near as severe as the BIOS screen and the missing text makes me think it's something else entirely, but the RAMDAC is definitely affected by out-of-vblank palette writes. DSC_4977.jpg These are the results from running SNOOP. The card …

Re: Artifacts/dots on 0ws Orchid Prodesigner IIs, DRAM not the issue

Posted on 2024-01-26, 11:55

in Marvin \ Video

in Marvin \ Video

Have you tested on another mainboard? the 0WS isn't for the onboard ram, but for the ISA interface. I wonder if this could be a motherboard thing? The documentation on Diamond SpeedSTAR24 manual above says "Bus timings on motherboards vary". Do you have another motherboard to test it on? No …

Artifacts/dots on 0ws Orchid Prodesigner IIs, DRAM not the issue

Posted on 2024-01-26, 06:50

in Marvin \ Video

in Marvin \ Video

I got this very pretty Orchid ProDesigner IIs a few days ago and it really is a cool and beautiful card. DSC_4969.jpg The only problem, when the card is set to Zero Waitstate mode, it shows these colored dots on the BIOS. Similar dots are shown in benchmarks like speedsys and in certain resolutions …

Re: Post your 386 Speedsys results here

Posted on 2023-12-24, 12:46

in Marvin \ System Specs

in Marvin \ System Specs

I probably will, but there are so many variants I don't know what to call it to make it most helpful. I suppose though that including a list of the known variants will let people search for it most easily.

Re: Post your 386 Speedsys results here

Posted on 2023-12-24, 11:33

in Marvin \ System Specs

in Marvin \ System Specs

I have the same board with a green PCB. One thing weird I noticed about it is that it doesn't really appear to support Cyrix chips out of the box even though the jumper settings are silk screened on the board. Infact, I think one of the Cyrix specific jumpers even causes it to fail POST. I'm gonna …

Re: Post your 386 Speedsys results here

Posted on 2023-12-23, 17:07

in Marvin \ System Specs

in Marvin \ System Specs

@iyatemu, the CPU's internal cache is also disabled. Oh, it's enabled. Speedsys just can't see something that small. Here's the same test done literally just now with it off (only the CPU test and nothing else). SSTIMG03.gif Here is also a much earlier test closer to completely stock from awhile …

Re: Post your 386 Speedsys results here

Posted on 2023-12-23, 09:18

in Marvin \ System Specs

in Marvin \ System Specs

CPU: Cx486DLC-40GP FPU: Gray Cx83D87-40-GP Motherboard: Digicom 386H (this one, it's my actual board): https://theretroweb.com/motherboards/s/digicom-386h Chipset:OPTi 495SX Cache: 128KB 20ns with 20ns TAG BIOS: Mr.BIOS OPTI4BH, made for OPTi 495XLC, but seems to work beautifully here somehow. …

Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2023-11-12, 08:01

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Did somebody buy up all of the SXL2s? None of the places I had bookmarked that had them do any more. Looks like I'm not getting one of these put together any time soon. Shame.

Re: SBVGM (DOS) VGM Player

Posted on 2023-08-21, 20:40

in Release Announcements

in Release Announcements

[*]Fixed bug where OPL3 would not properly play OPL2 VGMs right after playing and OPL3 VGM.[/list] So, funny story. I just tried it with SBVGM *32* v1.42 and it doesn't happen. 2-op plays fine after 4-op, but the bug only occurred with the non-32 version. It's already fixed so I'm not sure how much …

Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2023-08-16, 12:12

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I don't like to reward companies with high pricing and I'll do a bit of legwork finding another supplier, especially for a project like this that's just a hobby. I'd like to reward myself with in-spec products, especially when I'm relying on them keeping a 30 year old CPU running. Not to mention …

Re: SBVGM (DOS) VGM Player

Posted on 2023-08-14, 21:20

in Release Announcements

in Release Announcements

have been thinking about possible CPU PCM support for the 32-bit version though and other approaches to possibly improve the playback speed. I'll be happy as long as a 486DLC-40 can do it. :) Another thing I've noticed (which is actually fixable) is that it doesn't seem to reinitialize the OPL3 …

Re: SBVGM (DOS) VGM Player

Posted on 2023-08-14, 02:50

in Release Announcements

in Release Announcements

I must say, I'm loving what SBVGM can do while really lamenting what it can't do. No CPU PCM support (or DMA/ADPCM support for SB16 or OPNA) seems bizarre when the MSX equivalent can manage. Another thing I've noticed (which is actually fixable) is that it doesn't seem to reinitialize the OPL3 when …

Re: Vintage PC Hardware Stores in Japan

Posted on 2023-08-12, 07:08

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You're not gonna find a lot of 90s IBM stuff in Japan. It's almost all gonna be PC-x8 with a healthy sprinkling of MSX and X68000. Very little for AT and XT. if JPC stuff is what you're actually after (or seems interesting enough to start getting into) BEEP! is a great place to look. Huge selection …

Re: 386DX upgrade to 486DLC

Posted on 2023-08-10, 19:36

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Figure out what jumpers JP1 and JP5 do, one (probably JP1) should be connected to the soldered CPU FLT# pin. Not sure what the other one is for, should not be needed and the description printed on the mobo might be incorrect. If his mobo is anything like mine was , there is no jumper present for / …

Re: New to retro x86. 486DLC cache/A20 issues on mysterious mobo variant.

Posted on 2023-07-20, 23:26

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I hope I didn't send you on a merry chase for problems you don't have, but better to be sure then to discover corrupted data or suffer random system crashes. Not at all. I tried tracing JP5 when I first got the board but got lost because I started from the jumper itself which was in the middle of …

Re: New to retro x86. 486DLC cache/A20 issues on mysterious mobo variant.

Posted on 2023-07-20, 17:51

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, you could test if the FLUSH pin on the DLC CPU socket (E13) is connected to the chipset. I've never seen that on OPTi based mobos but then again I've never seen a proper datasheet for this chipset either. If it's unconnected and floating you are just lucky the internal leakage of the input …

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