MOUNTing Problem

[toml_12953]

In my 8800c, I'm using the FDC+ with two Teac 55-GFR-149 5.25" HD floppy drives configured as 8" drives. When I do a MOUNT 1, I get an I/O error. If I do an UNLOAD then MOUNT 1 again, it always works. The second try always works.

Any idea what's going on?

Tom L

[AltairClone]

I assume you’ve specified two drives during the BASIC startup sequence? What happens if after booting you type MOUNT with no parameters? That should mount drive 1 and then drive 0. Let me know what happens.

Mike

[toml_12953]

I assume you’ve specified two drives during the BASIC startup sequence? What happens if after booting you type MOUNT with no parameters? That should mount drive 1 and then drive 0. Let me know what happens.

Mike

Yes, I specified two drives at startup (HIGHEST DISK NUMBER? 1) The first time I mount with no parameters it tries to mount drive 1 first and gets the I/O error. If I unload and mount again, both drives mount OK with drive 1 mounting first.

Tom L

[AltairClone]

Let me know which disk images you're using on drive 0 and drive 1 and I'll see if I can duplicate your symptoms.

Mike

[toml_12953]

Let me know which disk images you're using on drive 0 and drive 1 and I'll see if I can duplicate your symptoms.

Mike

They're "Disk Basic v300-5-F.dsk" in drive 0 and "Games on 300-5-F.dsk" in drive 1

both from your downloads area

http://www.altairclone.com/downloads/ba ... py%20Disk/

I copied them to the floppies with your PC2FLOP program. I'll try to copy them again to see if that helps.

Tom L

[AltairClone]

What if you do "MOUNT 0" followed by "MOUNT 1" immediately after booting - does either mount fail?

Mike

[toml_12953]

What if you do "MOUNT 0" followed by "MOUNT 1" immediately after booting - does either mount fail?

Mike

When I first turn on computer:
MOUNT with no parameter hangs the computer. No OK prompt. If I hit reset then try to MOUNT again, I get DISK ALREADY MOUNTED
MOUNT 0 followed by MOUNT 1 gives DISK I/O ERROR when I do drive 1

After I do the first UNLOAD:
MOUNT with no parameters mounts drive 1 then drive 0 with no error
MOUNT 1 mounts drive 1 with no error

Tom L

[toml_12953]

I thought there might be a problem in the MOUNT command itself since I got garbage when I tried it on my AltairDuino but it turns out it's the MAX3232 that's flaky.

[AltairClone]

Swap the drive jumpers on the two drives so that drive 0 becomes drive 1 and vice-versa. Let me know if the problem changes.

Mike

[toml_12953]

Swap the drive jumpers on the two drives so that drive 0 becomes drive 1 and vice-versa. Let me know if the problem changes.

Mike

Baffling! I switched the drive jumpers but kept the drives on the same drive cable connectors. MOUNT now works in all cases!
I don't see a removable resistor pack on the drives. Is there one? If so, where?

If one drive had the resistors but the other didn't and I didn't have the drive with the resistors on the
last cable position would that explain the problems I was seeing?

*UPDATE* I switched the drives on the cable so that the new drive 0 is where the old drive 0 was and MOUNT still works fine in all cases.