Re: Adding HD to 1000A

JBlaser wrote:

All right, all of you Tandy 1000 experts...here's one for you:

I'm trying to add a vintage hard disk to my vintage 1000A. I know there
are
lot's of choices, even IDE or SCSI is a possiblity with these old systems,
but I'm trying to keep this all in the realm of mid-1980's tech.

My 1000A (BIOS 01.01.00) has seen the Intel 8088 replaced with a NEC V-20
CPU long ago, and has a PLUS Memory Expansion board installed with
512KB of RAM and the PLUS RS-232 daughter board in the left-most
(outside) slot. Otherwise, the system is in it's original configuration.

I'm trying to add a 20MB MFM drive (a Seagate ST-225) using a Western
Digital WD1002S-WX2 controller. I have tested both the controller and the
hard disk in a Leading Edge Model D PC clone, and confirmed that they
are fully functional. I have cut the W7 hardwire trace on the solder-side
of
the WD controller, and jumpered pins 2-3 to select IRQ 2.

Here's what happens:

When booting up I see the normal MEMORY=640K message, then the
floppy drive spins with the drive select LED showing for a second, then a
pause, and then one or the other of:

A) The hard drive's LED lights up and stays on forever, and the system
hangs at that point and never boots. CTRL-ALT-DEL is effective for a
warm reboot.

B) The hard drive's LED briefly flicks on and off, another pause, and then
the system boots from my boot floppy. But any subsequent attempt to
access the hard drive results in the hard drive LED lighting up and staying
on, and the machine hangs forever. A CTRL-ALT-DEL is effective for a
warm booting.

So, it seems that I don't have everything set up just right. I'm at a
loss,
since all of my online research indicates that as long as I have the 01.01.
00 BIOS, the memory expansion board with DMA, and use IRQ 2 on the
controller, it should "just work".

I was lucky to get my hands several WD1002S-WX2 controllers at the
same time, and I've tried all five of them (yes, I mod-ed each for IRQ 2),
with the same results.

Any ideas?

TIA,

Jared

See:

http://www.oldskool.org/guides/tvdog/1kfaq.html

It's not just the BIOS upgrade. See information about the PAL upgrade
issue as well. If the BIOS was upgraded "way back when", but the PAL
chip wasn't changed you may be sunk.

Rick
.

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