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

Posted on 2023-07-01, 06:04

by

by bazingaa

in Marvin \ Sound

in Marvin \ Sound

hellooo, just a quick question about U2, Should it be 74CB3T3245 (https://github.com/polpo/picogus/blob/main/hw/bom.csv) or 74LVC244 (https://polpo.org/picogus/bom/) ? I found two conflicting part numbers at BOM CSV and interactive BOM. Anyway both looks like to work similar with similar pinout. …

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

Posted on 2023-06-30, 06:45

by

by bazingaa

in Marvin \ Sound

in Marvin \ Sound

hellooo, just a quick question about U2, Should it be 74CB3T3245 (https://github.com/polpo/picogus/blob/main/hw/bom.csv) or 74LVC244 (https://polpo.org/picogus/bom/) ? I found two conflicting part numbers at BOM CSV and interactive BOM. Anyway both looks like to work similar with similar pinout.

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Re: Xi 8088 by Segey Kiselev

Posted on 2023-06-29, 10:59

by

by bazingaa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello guys! can anyone recommend a case to mount micro8088? What type of backplane are you gonna get/use? this determines the size of said case. or you could even make your own :D I got a original IBM 5160 case (sold for "sleeper" builds). current backplane only has 3 isa slots and no power, kinda …

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Re: Xi 8088 by Segey Kiselev

Posted on 2023-06-26, 10:37

by

by bazingaa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello guys! can anyone recommend a case to mount micro8088?

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

Posted on 2023-06-19, 04:58

by

by bazingaa

in Marvin \ Sound

in Marvin \ Sound

Where do you live Ian? Asking to figure out shipping costs Also, what platforms do you need? The biggest need was a VIA MVP3 chipset Super Socket 7 board, as I've gotten multiple reports of DMA issues on those. I have a VIA MVP4 SS7 board - PCCHIPS M585LMR (not an extra one though). I an planning …

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

Posted on 2023-06-19, 04:52

by

by bazingaa

in Marvin \ Sound

in Marvin \ Sound

Just got PCBs from JLC PCB (USD 9 for 5 PCB including shipping) and SRAM, DAC from Aliexpress 😁 Gonna order other parts from Digikey and build it 😀 I plan to build one as GUS and other one as OPL. I think I don't need the SRAM to be soldered for the OPL one ? isn't it ?

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

Posted on 2023-06-07, 14:19

by

by bazingaa

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

Posted on 2023-06-07, 08:24

by

by bazingaa

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 … atasheet_en.pdf

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Re: K6-2 Recycle Bin Rescue

Posted on 2023-06-07, 05:40

by

by bazingaa

in Marvin \ System Specs

in Marvin \ System Specs

Hi, I got the same motherboard and I found your blog post really helpful. I got it even without cables for VGA etc so I am using with a PCI VGA card. My ASUS ATX form card works well for the USB+PS2 header and I can use USB keyboard to even access BIOS. I also found the motherboard manual from …

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Clock Multiplier issue on PCChips M585LMR (v 1.2)

Posted on 2023-06-07, 05:27

by

by bazingaa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I am trying to configure CPU settings with a Pentium MMX 233 MHz CPU on a PCChips M585LMR (v 1.2). No matter what multiplier I set on the BIOS, it works at 2x with the selected bus speed. Same issue on "Auto : 233 MHz P55C" and "Manual" mode. Ex : If 3.5x @ 66 selected , CPU speed is 2x66 = 133 MHz …

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

Posted on 2023-06-07, 05:03

by

by bazingaa

in Marvin \ Sound

in Marvin \ Sound

I am planning to build one when time permits 😀 Is there any OPL3 emulator project we can integrate with this ? 😀 edit:ordered 5 PCBs in white colour for a change 😉

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Re: Help on reviving PCCHIPS M571 Socket 7 motherboard

Posted on 2023-06-07, 04:52

by

by bazingaa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

#UPDATE# Got a PCChips M585LMR and tested CPU on that. CPU is working. Also got a Pentium-MMX 166 MHz CPU and tested on M571LMR, no signs of life. So, I have given up the resurrection for the time being. :( Also PCI POST card doesn't show any SYS or CLK or LCD display on that working board. …

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Re: Is it possible to mount a small Baby AT motherboard in a mATX case?

Posted on 2023-06-02, 03:57

by

by bazingaa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It's been a while since I've thought about this :) The casefront and caserear files are two separate parts. One connects the screw holes near the front of the case to AT motherboard locations, the other is for the bit at the rear. The 3d printed version I've shared doesn't need to remove any …

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Re: Help on reviving PCCHIPS M571 Socket 7 motherboard

Posted on 2023-06-02, 03:49

by

by bazingaa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have one of these boards. I had some wonkiness getting mine to work as well. I made a thread on it, if you care to read through it. In the end I ended up using a Cyrix MII in this board, but it's still working to this day. I would recommend the use of ATX PSU. https://www.vogons.org/viewtopic.php …

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Re: Help on reviving PCCHIPS M571 Socket 7 motherboard

Posted on 2023-06-02, 03:40

by

by bazingaa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

bazingaa , it's useful site about PCChips M571 . If you haven't found it by yourself. You can find schematics there. IMO, the voltages of VRM on your photo look good: Vcore about 3V, Vio about 3.5v. Also I can recommend youtube channel by Tony359 and his video about reviving PCChips board: https:// …

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Re: Help on reviving PCCHIPS M571 Socket 7 motherboard

Posted on 2023-06-02, 03:34

by

by bazingaa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Old pre-PCI 2.2 boards didn't supply 3.3V to the PCI bus, so nothing abnormal there. That's why later PCI cards that require 3.3V don't work on older boards without modification. So lack of 3.3V is not your issue stopping POST - that board would never have had 3 3V on PCI. Thanks a lot for the …

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Re: Help on reviving PCCHIPS M571 Socket 7 motherboard

Posted on 2023-06-02, 03:31

by

by bazingaa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

What's the deal with this jumper? That is actually the front LED/SW header. As I remember those broken pins were NC anyway. Looks like a bent pin and soldered to a transistor. Is that factory? That is actually the front LED/SW header. As I remember those broken pins were NC anyway. Looks like a …

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Re: Is it possible to mount a small Baby AT motherboard in a mATX case?

Posted on 2023-06-01, 07:52

by

by bazingaa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ah I didn't realise that I'd shared both types. The 3mm version is for use where the standoffs can't be removed, so the ATX to AT adapter will sit on top of those standoffs, raising the motherboard in the case by 3mm. Then the 3mm card bracket riser is needed to screw the cards in securely. The …

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Re: Help on reviving PCCHIPS M571 Socket 7 motherboard

Posted on 2023-06-01, 01:20

by

by bazingaa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

### UPDATE ### Just to confirm whether 3.3 V is needed to run PCI POST card, I tried below steps. I found out that 4th PIN pf P4 connector in PCI POST card is connected to B41 pin of the PCI slot which is +3.3 V. I injected 3.3 V to that pin using an external 3.3 V regulator powered from floppy …

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Re: Help on reviving PCCHIPS M571 Socket 7 motherboard

Posted on 2023-06-01, 01:02

by

by bazingaa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Zerthimon wrote on 2023-06-01, 00:44: What's the deal with this jumper? That is actually the front LED/SW header. As I remember those broken pins were NC anyway.

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