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USB ISA cards?

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Reply 121 of 125, by 8bitbubsy

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FreddyV wrote on 2022-07-17, 09:11:

The ALI express board ROM Does not work, there A18 and A19 @ lines are not connected.
This board is bugged...

Wouldn't that still work, though limiting you to a 128kB ROM (or so)?

486:
- Motherboard: "SIS 486G 3.3/5V Ver:E" w/ 256kB L2 cache
- CPU: Intel 486DX2 66MHz
- RAM: 16MB 60ns FPM
- VGA: S3 Vision864 2MB VLB
- Audio: SB16 CT2800 (real OPL3)
- ISA PS/2 mouse card
- ISA USB
- MS-DOS 6.22 + WfW 3.11

Reply 123 of 125, by cyberluke

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FreddyV wrote on 2022-07-17, 09:11:
cyberluke wrote on 2022-07-17, 07:43:

For tech support, you can mail this guy directly: mj@wch.cn (or tech@wch.cn). I bought random card USB ISA from AliExpress and it just contains the WCH (CH375) chip, so then you contact the manufacturer of the chip. That's what I did. It does not matter, who made the PCB (Lotek or Ali). By default Ali don't have the BIOS EEPROM included, but you can just buy EEPROM, write it, and put into socket (that's what the jumpers are for).

The ALI express board ROM Does not work, there A18 and A19 @ lines are not connected.
This board is bugged...

So you can just solder wire and connect A18 and A19 lines, would that be correct?

Reply 125 of 125, by Lynxman

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I tried it on my (486) IBM with a Pentium 83 MHz overdrive. The speeds went from 108 W 109 R to 365 W 375 R (typically). Much appreciated. 😀

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I tried setting the % to 1 and 2 but it just locks up when I try to do anything on the card. I also tried %255 and it corrupted the USB stick and I had to reformat it. 😀