Re: FB-354 drive incompatibility

Date: Fri, 22 Apr 2016 23:07:14 +0200
Message-Id: <>
> On 2016-04-22, at 22:36, Michał Pleban <> wrote:
>> All the Amigas move the head back and forth when waiting for the disk
>> to be inserted, because that's how they worked the issue around.
> I assume that moving the head clears the /CHNG flag and re-inserting the
> disk sets it again?
> What about the opposite situation? When we have the disk in the drive
> and it is ejected - is /CHNG set in this case too?

I can't answer that out of my head. It's been some time since I last time touched that stuff.

>> You mean other than faster mechanical wear of both the disk and the
>> drive, extra noise and increased power consumption?  Probably not
>> many ;-)
> Doesn't this constant moving of the disk head wear the drive too?

No if you use the workaround to the workaround ;-) which I thought to be easy but the guys pointed out that it is even easier.

>> I guess your original assumption that a dirty cheap PIC would do the
>> job still holds. A code for this even in asm is probably one screen
>> of lines or less either.
> Yes, but I am quite worried about the PCB size because space in the 1565
> case is very limited. So I would be much happier without the PIC.

Then tapping on the switch line is probably your best option. It won't be as "elegant" since one will have to go with iron and wire to each drive one might want to put in but solves other problems.


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