[Coco] FD-501 controller not working with CoCo3?

[Mike Pepe]

> -----Original Message-----
> From: coco-bounces at maltedmedia.com [mailto:coco-
> bounces at maltedmedia.com] On Behalf Of Rich Carreiro
> Sent: Thursday, May 08, 2008 9:58 AM
> To: coco at maltedmedia.com
> Subject: [Coco] FD-501 controller not working with CoCo3?
> 
> As a born-again CoCo'er :), I've been pulling stuff
> out of the attic and acquiring stuff on eBay.
> 
> One of the things I have is a FD-501 controller.  I don't
> have any FD-501 drives, though.  What I do have (among
> some older, single-drive, vertical units) is a FD-500
> drive unit.
> 
> Anyhow, when I connect it all together, the floppy works
> fine with a CoCo2.  But when I try using a CoCo3, things
> simply don't work.
> 
> I get the Disk Extended Color BASIC prompt fine, but when
> I do any disk operation, the drive turns on, spins for
> a couple of seconds (with no "gronking"), and then turns
> off followed by the computer giving me an ?IO ERROR.
> 
> Any idea what may be going on?
> 
> --
> Rich Carreiro                            rlcarr at rlcarr.com
> 
> 
> 
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I would guess either the cartridge connector is dirty, or the CPU on
your CoCo 3 has a blown halt or interrupt line.

I think if you POKE &HFF40,128 that will trigger the halt flip-flop. The
CoCo should hang if you do that. If you get OK back, the halt line is
probably blown out.

-Mike