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Re: USB ISA cards?

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 …

Re: USB ISA cards?

The way the CH375 Chip is done also limit everything. This chip has a 64Bytes buffer, so we need to send another read command and wait the end of the transfer, after each block of 64 Bytes. Then, we need to add the time of the transfer to the CH375, then the transfer time to the ISA Bus and the " …

Re: USB ISA cards?

So, does it make sense to use the new 286 driver on a 486DX4-100? Will it work and give faster speeds? Even if Retro Eric answered :) I would like somebody to try, because in theory, it should work. You may need to add a value in the delay. In the 286 version of the driver, I did remove the delay …

Re: USB ISA cards?

With the new disktest i got very good results. Check out my video on the speed test: https://youtu.be/A37MQ0HgEpE Hi, Yes, better :) What is your 286 machine ? On my 286 8MHz, SpeedTest is at 400Kb/s for Write. (Tandy 1000 TL/2) It can be faster with the LoTech board and the "216" driver, this …

Re: USB ISA cards?

Jinxter wrote on 2022-07-12, 16:35: I just tested the CH375286.SYS. v0.22 It works on my 286 10 Mhz machine. I copied PlanetX3 from USB to CF. 566KB tok 36Sec. Speed = 15,7KB/Sec. The original driver (V2.0A) was 9,25KB/Sec. And original V1.9 (no A) was also 15,7KB/Sec. Can you test with disktest ?

Re: USB ISA cards?

Hi, @Cyberluke Do you have experince in the CH375/CH376 Code ? It seems that the Command =0Ah and =0Bh can be used to do multiple sub commands. In the Driver, they are used to so things I can't identify... These "Advanced" Command are not present in the BIOS. For example: mov ah, 31h ; '1' call …

Re: USB ISA cards?

Hi, long time no see 1) do you have github or some website or cloud storage for this project? 2) what is A1? I can burn eeprom there 2) I bought it on Aliexpress, twice. The chip manufacturer is WCH. They already have this DOS driver for usb storage. I had some communication with them. I have links …

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