Recent content by modem7

Right now, you have yet to low-level format the TM-262 whilst it is attached to the WD1001-WX2. Therefore, presently, I expect that the WD1001-WX2 is unable to read/write any sector on the TM-262. So, still seeing an error code of 40h. That is odd. If your ROM BIOS did not support function 7...

How do you know that you have a 2764 EPROM on your WD1001-WX2? You could have masked ROM instead. Maybe you lifted the label to find out. If a 2764 EPROM, presumably you have an EPROM eraser. A 2764 works in the WD1001-WX2. Doubling up the 2732 image for the 2764 is the standard thing to do...

The 80286 CPU (PLCC packaged) is in a socket. In case of a poor connection, try re-seating it; remove then reinsert. The earlier thread at [here] discusses methods. Same with the two BIOS ROM's. Try re-seating those.

Oops. That should be 2 KB. In the 8 KB sized BIN file that you provided earlier, there is more than 2 KB of bytes in use. The 100693-4 BIOS at [here] has less than 2 KB in use, and so appropriately down-sizing that for a suitable (repeat: suitable) 2716 is possible (but unproven at this time).

Yes. And another possibility is for someone here to modify the drive table (and then adjust the checksum byte). You can see VeryVon doing that at post #21 at [here]. So, for example, you supply the make-model of your hard drive. That gives us the cylinder and head counts of the drive, and we...

Presumably you fit the switch block there after reading the information at [here]. Comment #1 The 'Hard drive selection' section is a hypothesis. Comment #2 At that web page, there are example photos of the WD1001-WX2. No switch block. Note that where it is proposed that a switch block could...

The drive table in your BIOS ROM appears to be at offset 3F0. I expect that those CHS will be shown if the /romlist switch of SpeedStor software is used. See [here] for example usage. How the BIOS ROM on the controller maps that table to the WD1002-WX2's switches is up to the author of the...

Yes, it should take minutes. The code is executing function 7 of INT13H. If present, the function 7 code is in your XT-class hard disk controller BIOS ROM. Function 7 is described at [here]. The DEBUG code on the pointed to web page is setting CH and CL so that the low-level-format starts at...

Noting that per [this], you may need to adjust the switch settings on the extender card. Incorrect/improper setting will not necessarily result in no operation; it might instead result in say, unreliable operation.

The 8-bit checksum is 00, which provides good (but not 100%) confidence in the content of the ROM. It looks like you have version G of the ROM. The one on my website is version E. When one does the "g=C800:5" thing, one is saying, start execution from offset 5 in the ROM at C8000. That...

As a crude comparison, the photo at [here] shows me measuring a +5V draw of 6A from the combination of an IBM 5160 motherboard and certain IBM made plugged-in ISA cards. So that excludes keyboard (stuff all power draw), floppy, and hard drives. From memory, the 'IBM Fixed Disk Adapter' draws a lot.

If you connect a 'standard' 1.44M diskette drive in place of the 5.25" drive, you can use 720K sized 3.5" diskettes. Details at [here]. Maybe you have the ability to do that. For XT-class controllers, there is no one way that works for all controllers. One usually just finds the user manual for...

FDISK will be trying to read the first sector, the MBR. From earlier posts, the first sector can sometimes be successfully read by the controller, i.e. you sometimes see "Error loading operating system". My guess is that if you try FDISK often enough, it will successfully read the first sector...

I have a web page on that controller at [here]. And that page points to the Compaq information at [here]. It is almost certain that you will need to low-level format the TM-262R (whilst it is in the Compaq Deskpro 8086), and then follow up with certain other activities. For now, how about you...

Confirm for us that you are writing of an extender card. See the photos at [here]. Provide a photo of your card, so that we can see these 'resistors', things that we are not expecting.