VOGONS


Reply 40 of 53, by TubeTimeUS

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The long wait is over!

I have a working sound card using a CPLD instead of the P82C611. It works in my PS/2 Model 50Z and it seems partially functional in the Model 95 I borrowed (the card ID gets read successfully by the BIOS but the machine can't boot due to issues with the floppy controller.)

Twitter announcement here: https://twitter.com/TubeTimeUS/status/1215071399829622784

Git repo here: https://github.com/schlae/plaid-bib-cpld

If you build the card and get it working in your MCA bus machine, please let me know so I can add it to the compatibility list.

Enjoy!

Reply 41 of 53, by keropi

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Although I have no PS/2 systems all this work you've done is simply amazing, kudos TubeTimeUS!!!!!
In essence it makes finding a nice PS/2 system a viable option if someone wants to actually use the system and not just display it on a shelf.

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Reply 43 of 53, by elianda

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Thats very good news and very good work. 👍

I have a Model 80 PS/2 and I'am interested to get one of the Plaid Bib cards. Though my soldering skills are rather basic.

Is someone going to produce some cards (ready to plug)?
I would compensate the efforts.

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Reply 44 of 53, by keropi

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elianda wrote on 2020-01-27, 20:10:

[...]

if there are kits or something send me parts - I'll solder them for you no worries 😀

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🎧Orpheus soundcard project
💻WTB Amstrad PC7486SLC-33 system

Reply 45 of 53, by elianda

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Here is some update from me. Eric sent me a Plaid Bib CPLD Edition and (after 11 days being stuck at customs) it finally arrived today.
It works in my Model 80. The only very minor issue I noticed is that sometimes after exiting Windows for Workgroups 3.11 the card gives loud noise until reinitialized. However this might be some software issue and not the cards fault at all.

Here are some pics:

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hw_sound_card_plaid_bib_back.jpg
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with_card.jpg
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It is the small card without shield.

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Reply 47 of 53, by Tiido

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That card looks really nice ~

T-04YBSC, a new YMF71x based sound card & Official VOGONS thread about it
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mida sa loed ? nagunii aru ei saa 😜

Reply 48 of 53, by keropi

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Tiido wrote on 2020-02-13, 03:17:

That card looks really nice ~

I also wanted to post that but forgot, it really looks very nice and the solder job is great

🎵Link to buy a PCMIDI mpu
🎧Orpheus soundcard project
💻WTB Amstrad PC7486SLC-33 system

Reply 49 of 53, by elianda

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Another update

We identified an issue in combination with memory expansion cards that use the MCA feature Matched Memory Cycle. Most memory cards use this feature for optimal transfer speed.
The issue appears when data is read from the OPL2 and randomly locks up communication with the card. To revive operation a power cycle is required.

Usually one would consider that the OPL2 is not used much with reading from it because playing music is mostly writing data.
Though the OPL2 is slow and requires delay after writing the address byte and after writing the data byte. The standard way for an ISA card that also the example music player uses on the Adlib disk is
6 dummy port reads after writing the address and 35 dummy port reads after writing data.
Basically every game/application that has Adlib support uses that approach as well.

My testing shows that the communication often get borked when starting a game and the code tries to detect an OPL2. When the a game runs it seems to work without failing intermittently.
Without extensive statistics I tried on Commander Keen 4 and on the 6th start the card went silent.
Some games seem to hit the issue always on startup like Legend of Kyrandia, which stayed always silent.

The problem is gone as soon as the memory expansion card is removed.

TubeTimeUS knows about the issue and I sent him also the test programs I wrote.
Maybe someone lives close and can borrow him a Model 80 for testing?

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Reply 50 of 53, by matze79

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Does it work in 55SX ? 😀

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Reply 52 of 53, by matze79

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Ok,
i will try soon.. but have some problems currently to order parts.

it would also be nice to get a Storage Solution for MCA,
maybe a IDE MCA Card 😀

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