Messages in this thread |  | | | Date | Sun, 31 Oct 2004 13:22:03 +0100 | | From | Ondrej Zary <> | | Subject | HP C2502 SCSI card (NCR 53C400A based) not working |
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Hello, I have an old ISA SCSI card that came with HP ScanJet IIP scanner. It's HP C2502 card based on NCR 53C400A chip. I was unable to get it working with g_NCR5380 driver so I tried loading the official MINI400I.SYS driver in DOSemu. I was surprised that the values sent to the ports are not the same as in the g_NCR5380 driver.
The g_NCR5380 driver uses these "magic outbs" to configure the card (this sequence disables the card): outb(0x59, 0x779); outb(0xb9, 0x379); outb(0xc5, 0x379); outb(0xae, 0x379); outb(0xa6, 0x379); outb(0x00, 0x379);
This is the output from DOSemu: 779 < f 379 < 22 379 < f0 379 < 20 379 < 80 379 < 00
The magic numbers are different - so I have a card that is not supported by the driver. I've changed the numbers in the driver to match my card but I'm still unable to get it working.
The g_NCR5380 driver uses this to check if the card is present at a particular base address:
outb(0xc0, ports[i] + 9); if (inb(ports[i] + 9) != 0x80) continue; The MINI400I.SYS uses something different: (this is failed presence test at base address 0x280) 28e < 25 28f < a5 28f > ff (this looks like a successful test at base address 0x350) 35e < 25 35f < a5 35f > a5 35f < 5a 35f > 5a 35e < 0 35f < 0 359 < 80 359 < 10 351 < 0 352 < 0 353 < 0 354 < 0 357 > ff 359 < 80 359 < 10 351 < 0 352 < 0 353 < 0 354 < 0 357 > ff 351 < 80 351 < 0 357 > ff According to this, I think that my card has the 53C400A chip registers mapped to different addresses (offsets) but I'm unable to determine what the mapping is. I was also unable to find the 53C400A datasheet which might help a bit.
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