Re: Amstrad Assembler ??
- From: Hauke Hagenhoff <no_Hauke.Hagenhoff_spam@xxxxxx>
- Date: Thu, 28 Jul 2005 07:48:32 +0200
Prodatron / SymbiosiS schrieb:
> is it not possible to use modern HD drives?
it depends on the drive.
Most drives today are hardwired rubbish.
> I am still searching for such a cable.
The instructions on Ulrich Cordes' page are incomplete though.
1. Get a PC floppy cable, any will do, but the best is a cable for two
drives inside a tower-case (= longer)
2. Cut the cable in a way that you keep the longest untwisted part of
the cable plus a non-indexed plug (no holes closed)
This is the most complex part of it all.. the mainboard connector might
have an index hole (Lucky you if not), while the floppy side of a cable
for only one floppy is twisted. This is why a dual-floppy-cable is the
best choice: Just cut the part from PC-drive B: to PC-drive A: (The
twisted part) and the connector on the mainboard side.
In the worst case you got an indexed cable for one floppy drive. In this
case, cut the mobo connector anyways, unMOUNT the connector on the
floppy side and remount it right before the twist using the same
orientation.
In this case, you could as well have gotten the cable all in parts, but
I bet floppy cables are cheaper :-)
3. Squeeze a 36-pin Centronics plug onto the other end of the cable, so
that the two spare pins and the red wire are on the left when it is
plugged in, looking from the normal typing position. (Yes, I know, I'm
building the cable the wrong way around, but this is the way I did it
and it worked).
4. On the floppy side, connect the plug in the wrong direction (Red wire
showing away from the power connector)
Depending on your model of floppy drive and your desired functionality,
you are already done now.
Option 1:
Adding side switch:
Connect wire 3 (Counting from the power connector of the floppy, where
the red wire would NORMALLY be), floppy side to the common contact of an
alternating switch. Connect wire 3, CPC-side to one of the alternator
contacts. Connect wire 4, floppy side, to the other alternator contact.
In other words: The switch will either shorten wire 3 and 4 on the
floppy (Grounding Side Select), or connect wire 3 to the CPC, allowing
the CPC to control Side Select.
Grounding Side Select forces side 1.
Opening it or connecting it to the CPC normally selects side 0, as
AMSDOS doesn't use the Side Select signal.
Connecting the side select signal to the CPC however allows CP/M or
alternative DOSes (VDOS?) and software solutions like CPC-DSK to read
both sides, as long as the side switch is in position "Side 0", that's
why we normally want to connect wire 3 to the CPC in the second position
of the switch instead of just leaving it open.
Now to the RDY fix, depending on the drive type:
a. Modern drives got no jumpers at all and default to a Disk Change
signal on pin 34 and DS1 being set (B:).
b. Older drives got jumpers for DS0/DS1, which is of no use for us
either, as long as we want to connect a B: drive to the CPC.
c. REAL old drives got plenty of jumpers, or at least jumpers to
generate a RDY signal on pin 34:
- Chinon FZ-354
- Chinon FZ-357
- TEAC FD-235HF 3201-U
- TEAC FD-235HF 3240-U5
- TEAC FD-235HF 3217-U
- TEAC FD-235HF 3218-U
With such a drive, just jumper RDY34 and you are done. Else you need to
do the RDY-fix from Ulrich's site too.
--
Mit freundlichen Grüssen
Hauke Hagenhoff
.
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