digger wrote on 2024-05-21, 18:58:

Didn't PCMCIA lack DMA support, though? (The original 16-bit standard, not counting 32-bit CardBus.)

I guess it could still support non-DMA sound devices such as Adlib, Disney Sound Source, CMS and Tandy/PCjr 3 voice.

Yes, PCMCIA lacks DMA but there is a DMA emulation technique used by IBM on their 3D Sound PCMCIA card, apparently patented by them so nobody else used it. yyzkevin has reimplemented it for his PCMCIA card and it's working with Sound Blaster with digital sound even in DOS protected mode, as you can see here: https://www.youtube.com/watch?v=YoJ12leojwo

polpo wrote on 2024-05-22, 04:45:

there is a DMA emulation technique used by IBM on their 3D Sound PCMCIA card, apparently patented by them so nobody else used it. yyzkevin has reimplemented it for his PCMCIA card and it's working with Sound Blaster with digital sound even in DOS protected mode

any technical details on how that works?

rasz_pl wrote on 2024-05-22, 05:12:

polpo wrote on 2024-05-22, 04:45:

there is a DMA emulation technique used by IBM on their 3D Sound PCMCIA card, apparently patented by them so nobody else used it. yyzkevin has reimplemented it for his PCMCIA card and it's working with Sound Blaster with digital sound even in DOS protected mode

any technical details on how that works?

Here the mentioned patent https://patentimages.storage.googleapis.com/9 … e/US5768631.pdf

And this thread has many posts from yyzkevin that shows the progress and has the details
Re: Newly made PCMCIA sound card

ok got it
Re: Newly made PCMCIA sound card
Re: Newly made PCMCIA sound card
>dma emulation interrupt calls.
Re: Newly made PCMCIA sound card

yep, pretty straightforward and doesnt require protected mode trapping

IBM's method requires the system to have an actual DMA controller, so the emulation software can read how it was configured by the application, correct?

A bit off-topic here, but doesn't that mean that this emulation method would not work in a system lacking an Intel 8257 compatible DMA controller, like say, newer post-ISA and post-floppy motherboards?

8257 legacy compatibility is still present all the way to at least 2014, I think its missing from 100-300 series chipsets from 2015-18.

@Freddy:

Can't wait to try the EMS on one next pay cheque 😀 Thank you greatly (!).

I use the 2MB LowTech card pretty heavily via Turbo C++ for fun and pleasure rather than profit. This'd be rather good!

Great project

Saw the second version of the ISA card demostrated by Adrian's Basement on YouTube.

I am impressed with the ease of use.

Hope to see it available in South Africa

keyboard emulation with USB is a sore need. The keyboards with DIN plugs are not available here.
With Apple Performa computers, .... it is the ADB keyboards and mice in short supply - ADB=Apple Data Bus.

HENNIE from Sunny South Africa

@Freddy:

out of curiosity, would it be possible to set the config settings via the config file, for things like memory etc, as you can set them in the bios but they dont save after power off.
i have updated to latest firmware and the added adlib, wifi and other bits if excellent.

Thank you Freddy for the great work.