Re: Roland MPU-401 more ROM dumps and info

Posted on 2023-11-03, 20:22

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by Cloudschatze

in Marvin \ Sound

in Marvin \ Sound

I've dumped MPU versions 1.3, 1.3A, 1.5A, and 1.5A_JMSC. The 1.5A version was found in an earlier, upgraded MPU-401, and matches the MAME dump. The (8KB) "JMSC" version was found in a couple of "tester" MPU-401 units. Roland's integrated MPU-401 daughterboard, the RJA-401-HB, contains MPU version 1. …

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Re: Will the Book 8088 be a future classic?

Posted on 2023-10-20, 20:53

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by Cloudschatze

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

betamax80 wrote on 2023-10-20, 16:18: I'm so happy to see that FastLynx is still available to buy, it's still so useful! Probably too late to save you the $20, but Dave Dunfield's "DDLINK" is a nice, free alternative to FastLynx. DDLINK: Easily move files between/To/From DOS systems

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Re: How Roland CM-300 works: no Control ROM and no SoundBank ROM?

Posted on 2023-10-18, 03:25

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by Cloudschatze

in Marvin \ Sound

in Marvin \ Sound

mattw wrote on 2023-10-18, 02:07: So, how Roland CM-300 is supposed to work - where on the boards are the ROM chips located - nowhere to be found?! The discrete GS program and wave ROMs are on the opposite, unphotographed side of the RLP daughterboard. The CPU (IC6) contains its own ROM.

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Re: The Soundblaster DSP project

Posted on 2023-10-13, 19:52

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by Cloudschatze

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

However, then how the software distinguish in such case from "residual" Acknowledge and real Acknowledge on SB16... By checking the DSR status bit from the Command port, which is the predecessor behavior to checking for the acknowledgement byte at the Data port. I didn't make this very clear in the …

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Re: The Soundblaster DSP project

Posted on 2023-10-13, 19:20

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by Cloudschatze

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

at least I got totally lost now - I mean what those known "Fake ACK" cards do more then? I mean as far as I understand from what @Cloudschatze wrote and based on my test results, the "Fake ACK" cards transmits electrically out what is send , while SB16 blocks it when it's not acknowledged. …

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Re: The Soundblaster DSP project

Posted on 2023-10-13, 17:36

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by Cloudschatze

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

the things are now getting real unexpected turn, because the above is true, but for my CT4170 DSP V4.16 card (which as Build-in MCU in the main chip cannot be modified anyway) and here is how the test looks: C:\>debug.exe -o 331 ac -i 330 FF--> BAD -i 330 FF--> BAD -o 331 ad -i 330 FF--> BAD -i 330 …

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Re: The Soundblaster DSP project

Posted on 2023-10-13, 17:03

by

by Cloudschatze

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

IO 330 is bidirectional, of course. OK, let me test this same thing: https://www.vogons.org/viewtopic.php?p=1202056#p1202056 on my AWE32 and see how it looks like - maybe that will help us imagine the things better... be back in 10-15 minutes with the results. You won't get any response to, or …

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Re: The Soundblaster DSP project

Posted on 2023-10-13, 16:27

by

by Cloudschatze

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

In any way, just implementing "Fake ACK", if that is possible, will be very huge improvement. To implement this minimally, the SB16 needs to both acknowledge all MPU commands (even if unsupported), and accept/pass MIDI data without prior reception of the 0x3F, "UART mode" MPU command. Concerning …

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Re: DDLINK: Easily move files between/To/From DOS systems

Posted on 2023-09-23, 21:00

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by Cloudschatze

in DOS

in DOS

Recently used DDLINK to transfer data to a system that is "externally I/O challenged," and despite the 8250 UARTs, the 19200 bps serial rate, and the wireless RS-232 transceivers involved, the solution exceeded my expectations. Thank-you for sharing your work, Dave!

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Re: The Soundblaster DSP project

Posted on 2023-09-22, 13:33

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by Cloudschatze

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It's probably worth mentioning again that the cards bearing a CT1747 bus-interface chip don't exhibit the erroneous latched/spurious MIDI byte behavior that the patch is thought to resolve. (Perhaps the reason for that can now be determined, Maelgrum?) Sounds like we may need to wait for S95Sedan to …

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Re: Roland MT-32 and SC-55Mkii Wiring

Posted on 2023-08-30, 05:33

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by Cloudschatze

in Marvin \ Sound

in Marvin \ Sound

For setups involving just an MT-32 and Sound Canvas (or similar), you can get by without the use of any switch boxes at all. MIDI: AWE64G MIDI OUT -> SC-55mkII MIDI IN SC-55mkII MIDI THRU -> MT-32 MIDI IN Wherewith, you can either soft-switch between the two MIDI modules via SysEx, or, alternatively …

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Re: The Soundblaster DSP project

Posted on 2023-08-29, 03:39

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by Cloudschatze

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Which games support stereo PCM playback with an SBPro but not with an SB16? Zone 66 and anything else that uses the Renaissance CDFM engine (Amnesia demo, etc). Is a specific version/patch of Zone 66 required for stereo PCM playback? Version 1.0 appears to only present single-cycle, mono PCM …

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Re: The Soundblaster DSP project

Posted on 2023-08-28, 19:07

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by Cloudschatze

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Which games support stereo PCM playback with an SBPro but not with an SB16?

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Re: 386 DX-40 multi-sound card build (5 sound cards!)

Posted on 2023-08-08, 17:14

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by Cloudschatze

in Marvin \ System Specs

in Marvin \ System Specs

The second issue is the Roland LAPC-I. I noticed in certain games a high-pitched noise in the background. It was most noticeable with Monkey Island and Gateway. It appears that the LAPC-I is picking up or generating a high-pitched whine in this system. The pictured LAPC-I lacks a noise-mitigating …

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Re: ATI VGA Wonder-16 not working in 8088

Posted on 2023-08-07, 19:25

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by Cloudschatze

in Marvin \ Video

in Marvin \ Video

Anonymous Coward wrote on 2023-08-07, 16:14: That may be the general case, but it doesn't apply to the ATi cards. Was going to mention the same thing. It's a similar case with the ET4000-based Diamond SpeedSTAR and SpeedSTAR 24 cards.

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Re: Success!! Finally Got Sound Blaster Working with Tandy DAC on Tandy 1000 TL/2

Posted on 2023-07-31, 06:01

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by Cloudschatze

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

According to the markings on the chip, I have DSP Version CT1336A '92 (which I assume stands for 1992), and again, the card is a CT1350B. CT1336A is the newer version of the bus interface chip, and is likely paired with a 2.02 DSP/MCU. That combination could be the difference. Also surprisingly, I …

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Re: Success!! Finally Got Sound Blaster Working with Tandy DAC on Tandy 1000 TL/2

Posted on 2023-07-31, 04:07

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by Cloudschatze

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The "DMA Sharing" jumper on the SB2.0 and Pro cards never did anything helpful for me in this regard; I've long-since been using software-configurable cards in Tandy PSSJ-bearing systems instead. Since the sharing sounds like it's working for you, I'm curious to know what the difference might be. …

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Re: Which model computers have the most ISA slots?

Posted on 2023-07-30, 20:19

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by Cloudschatze

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Guessing the intent, several of IBM's mid-tower PS/1 models feature eight, 16-bit ISA slots, and, unlike lesser-integrated systems, they can all be populated with sound cards. Why would anyone want 8 sound cards? Speaking for myself, compatibility and variety would be the pretense, but the real …

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Re: Which model computers have the most ISA slots?

Posted on 2023-07-30, 19:25

by

by Cloudschatze

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Guessing the intent, several of IBM's mid-tower PS/1 models feature eight, 16-bit ISA slots, and, unlike lesser-integrated systems, they can all be populated with sound cards.

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

Posted on 2023-07-26, 14:50

by

by Cloudschatze

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Completed a collection of the Roland-published, "Listen Series" GS MIDI albums.

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