Casio CZ/ VZ/ FZ - Pro Series

On Tue, 4 May 2015, billbigrig@... [CZsynth] wrote:

> The disc problem could be by using HD/D disks. You need DD/DS discs. 
> You can fool the machine by closing a tab, (or taping it over), so the 
> machine doesn't know it's HD/DS. It will then format.

The FZ-1/HS-1 needs HD disks. It slams 1.25MB onto each disk (80 tracks 
*2 sides *8 sectors *1024 bytes/sector), that won't work with DD disks 
(which have a raw capacity of 1MB).

"Disk not ready" basically indicates a problem with the named signal. It 
can have several reasons:

- drive doesn't recognize presence of inserted disk
- drive doesn't spin to speed
- write attempt to a write-protected disk
- defective 74ls14 driving the ready signal (so it always appears
   inactive to the FDC)
- defective 72065 FDC (uA765)

The classic problem, however, is that someone tried attaching a PC drive 
to the FZ-1/HS-1 and at least forgot to either jumper the drive's pin 34 
behavior from "disk change" to "disk ready" or just disconnect that pin 
(just wire it to motor on, for instance).

HTH,
 	Rainer