Re: What would you stick in this dual socket board?

Posted on 2018-07-03, 12:07

by

by stamasd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I realize this thread is almost a year old, but this is the only place on the www where I found someone who has a working Altserver/CS. I have recently acquired a motherboard that came from this system. I haven't powered it yet as I'm not in physical possession of it right now, but to build a system …

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Re: Equivalent of a GeForce2 GTS?

Posted on 2018-04-15, 12:41

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by stamasd

in Marvin \ Video

in Marvin \ Video

To the OP: look for a Quadro2 Pro also. It's the workstation equivalent of the GF2GTS. I have one and it performs indistinguishably from the true GTS. One tip for searching on sites like ebay, etc: often you will see cards listed only as "video card" or "nvidia card" without specifying the model - …

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Re: Best laptop for DOS/Win9x gaming?

Posted on 2018-04-14, 11:50

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by stamasd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My preferred laptop for DOS/Win9x gaming is a Thinkpad 770Z. It has a nice SVGA TFT display; not only that, but coupled to a SelectaDock III (model 3547-003, you can still find them on ebay) it also becomes upgradable; the dock contains ISA and PCI slots in which you can put sound and video cards of …

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Re: Wifi PCI adapter Under Dos/WFW3.11?

Posted on 2018-04-14, 11:30

by

by stamasd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I once got a whole lot of some cheap Chinese mini-routers (WT3020, about half the size of a pack of cigarettes) which I installed OpenWRT on; I have about 10 of them. I use them to bridge devices that have only wired LAN to my home wifi. Works flawlessly.

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Re: AWE32 memory expansion ?

Posted on 2018-02-24, 11:56

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by stamasd

in Marvin \ Sound

in Marvin \ Sound

I have bought in the past a lot of 2x16MB 30-pin RAM that was being sold for old Macs, and used it specifically as memory on a CT3600. It works fine.

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Re: YMF744, DOS, no DMA? (PC/PCI, SB-link tests)

Posted on 2018-02-21, 05:18

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by stamasd

in Marvin \ Sound

in Marvin \ Sound

I exchanged the ICH and ICH0 LPC Interface PCI ID's with the ones for ICH2 and ICH2-M, can you give it a try on your i850 motherboard stamasd? I used the driver from: http://www.yamaha.co.jp/english/product/lsi/download/ Just a quick update for those who look for the package above, the URL has …

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Re: HardMPU, anyone?

Posted on 2017-02-05, 15:18

by

by stamasd

in Marvin \ Sound

in Marvin \ Sound

From that picture I see that the narrowest pulses are about 1/3 of the 100us division, which is consistent with the midi rate of 31250 bit/s. Unfortunately my oscilloscope can't capture screens like that. I could try to determine if I've got the correct rate if I found something that can generate a …

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Re: HardMPU, anyone?

Posted on 2017-02-02, 14:04

by

by stamasd

in Marvin \ Sound

in Marvin \ Sound

^ dead ATMEGA? could be! Settings are OK with the same values so that's not the problem 101% Unlikely, I used 2 separate chips bought from 2 distinct sources. Also like I said, when a game with MT32 support is running I can see a signal on the card's output pin. I cannot determine the conformity of …

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Re: HardMPU, anyone?

Posted on 2017-02-02, 01:09

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by stamasd

in Marvin \ Sound

in Marvin \ Sound

Bad news again. That's not the problem. The CKDIV8 was disabled in the 1284 I was using. Just to eliminate any doubt, I played with the fuses until I had the exact same configuration as yours. Then I burned 2 chips with the firmware and these fuses. Tested both of them in the board. No MIDI data …

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Re: HardMPU, anyone?

Posted on 2017-02-02, 00:27

by

by stamasd

in Marvin \ Sound

in Marvin \ Sound

Yeah, pin 1. I was tired when I wrote that and didn't have the energy to check. Gotcha. Just wanted to double-check in case that might be the issue. I don't know how your programmer manages the fuse bits, but make sure CKDIV8 is disabled. That will make it appear to work but the MIDI baud rate will …

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Re: HardMPU, anyone?

Posted on 2017-02-01, 22:49

by

by stamasd

in Marvin \ Sound

in Marvin \ Sound

ab0tj wrote: stamasd wrote: Well the surrogate Vcc that is pin 2 anyway. 😀 Pin 2 should be GND... 1 is the "VCC through a resistor" pin Yeah, pin 1. I was tired when I wrote that and didn't have the energy to check.

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Re: CVX-2 : covox adapter

Posted on 2017-02-01, 13:27

by

by stamasd

in Marvin \ Sound

in Marvin \ Sound

Keep C6; I ended up placing a 25k in C28, and a 4.7nF in C2, can select either by jumpers.

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Re: HardMPU, anyone?

Posted on 2017-02-01, 00:48

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by stamasd

in Marvin \ Sound

in Marvin \ Sound

Can't really tell what the baud rate is by looking at the scope. It's an old, old Hitachi analog scope from the 1970s or so, can't freeze the signal or do any fancy visualizations with it. With an irregular signal, all I see is 2 voltage level lines connected by edges here and there. :) When I said …

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Re: HardMPU, anyone?

Posted on 2017-01-30, 01:32

by

by stamasd

in Marvin \ Sound

in Marvin \ Sound

And it's confirmed. The signal from output pin 6 when fed directly into the MT32 via a custom cable isn't considered a valid MIDI stream by the synth, as it doesn't react at all. Even though it does seem to contain bits of data when viewed on the oscilloscope.

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Re: HardMPU, anyone?

Posted on 2017-01-29, 19:43

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by stamasd

in Marvin \ Sound

in Marvin \ Sound

A bit busy with the family now, but when I get the chance (probably later tonight) I will put together a quick-n-dirty output adapter for the _actual_ pinout on the card, as opposed to one deducted from the schematic. That should put to rest any doubts about connectivity. Need to find my stash of …

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Re: HardMPU, anyone?

Posted on 2017-01-29, 15:56

by

by stamasd

in Marvin \ Sound

in Marvin \ Sound

Here's what I got so far. I first checked the oscillator to make sure it's working. The oscilloscope shows a beautiful 20MHz sine wave. Then I went directly to checking the output - pin6 on the output connector. And guess what, I see a stream of bits flowing out when a game is running. So the card …

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Re: HardMPU, anyone?

Posted on 2017-01-29, 15:30

by

by stamasd

in Marvin \ Sound

in Marvin \ Sound

All ICs test good. Time to take out the oscilloscope I guess.

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Re: HardMPU, anyone?

Posted on 2017-01-29, 14:07

by

by stamasd

in Marvin \ Sound

in Marvin \ Sound

Okay, programming the correct oscillator fuses made the error at the start of Gateway go away. So presumably now the device is recognized as an intelligent mode MPU. But I still get no output to the MT32, neither in Gateway nor in Monkey Island.

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Re: HardMPU, anyone?

Posted on 2017-01-29, 13:48

by

by stamasd

in Marvin \ Sound

in Marvin \ Sound

Gah I just realized that I programmed the MPU for "external oscillator" (0000) instead of "full-swing crystal oscillator" (0111). Be right back. 🤣

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Re: HardMPU, anyone?

Posted on 2017-01-29, 13:45

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by stamasd

in Marvin \ Sound

in Marvin \ Sound

keropi wrote: you need to start looking on the ICs then and make sure the PIC is programmed correctly Yeah I'll test all ICs. The MPU is programmed correctly, save for a bit of ambiguity for the clock fuses detailed above.

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