12 Jan
2008
12 Jan
'08
9:13 a.m.
Date: Sat, 12 Jan 2008 09:22:38 -0300
From: "Alexandre Souza" <alexandre-listas at e-secure.com.br>
Subject: Re: Creating new CP/M disks - Progress on IMSAI
> I?m looking for some advice/whatever on
engaging the motor when needed.
How is DS0 line activated? As far as I know the
sequence should be:
- Activate DS0, motor starts to run
- Activate "head load" so the heads can do their job
- Read/write
Since your motor is always on, seems that you have
DS0 activated
permanently. Isn't something wired wrong?
---------
As a matter of fact, the motor did run constantly on many 8" drives (remember
that many had 110V AC motors).
m
12 Jan
12 Jan
9:23 a.m.
Yes, but the heads engaged and disengaged to reduce wear. On modern drives,
the heads remain engaged but the motor stops.
I've found that the YE-380 drive from the original PC/At works properly for
this application, so if anyone has a working spare, I'd like to trade a Teac
FD55GFR for it.
On 1/12/08 9:13 AM, "M H Stein" <dm561 at torfree.net> wrote:
Date: Sat, 12 Jan 2008 09:22:38 -0300
From: "Alexandre Souza" <alexandre-listas at e-secure.com.br>
Subject: Re: Creating new CP/M disks - Progress on IMSAI
Rich
--
Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator
http://www.altair32.com
http://highgate.comm.sfu.ca/~rcini/classiccmp
> I?m looking for some advice/whatever on
engaging the motor when needed.
How is DS0 line activated? As far as I know
the sequence should be:
- Activate DS0, motor starts to run
- Activate "head load" so the heads can do their job
- Read/write
Since your motor is always on, seems that you
have DS0 activated
permanently. Isn't something wired wrong?
---------
As a matter of fact, the motor did run constantly on many 8" drives (remember
that many had 110V AC motors).
m
9:47 a.m.
It must have been a fluke...I can't get the YE drive to operate reliably
either. The drive won't recal consistently. I might try lengthening the HL
time in software and then give it another shot.
I may have to have to stick with the Teac drive and figure out a way to
control the heads by software.
On 1/12/08 9:23 AM, "Richard A. Cini" <rcini at optonline.net> wrote:
Yes, but the heads engaged and disengaged to reduce
wear. On modern drives,
the heads remain engaged but the motor stops.
I've found that the YE-380 drive from the original PC/At works properly for
this application, so if anyone has a working spare, I'd like to trade a Teac
FD55GFR for it.
On 1/12/08 9:13 AM, "M H Stein" <dm561 at torfree.net> wrote:
Rich
--
Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator
http://www.altair32.com
http://highgate.comm.sfu.ca/~rcini/classiccmp
Date: Sat, 12 Jan 2008 09:22:38 -0300
From: "Alexandre Souza" <alexandre-listas at e-secure.com.br>
Subject: Re: Creating new CP/M disks - Progress on IMSAI
Rich
--
Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator
http://www.altair32.com
http://highgate.comm.sfu.ca/~rcini/classiccmp
> I?m looking for some advice/whatever on
engaging the motor when needed.
How is DS0 line activated? As far as I know
the sequence should be:
- Activate DS0, motor starts to run
- Activate "head load" so the heads can do their job
- Read/write
Since your motor is always on, seems that you
have DS0 activated
permanently. Isn't something wired wrong?
---------
As a matter of fact, the motor did run constantly on many 8" drives (remember
that many had 110V AC motors).
m
10:29 a.m.
From: rcini at optonline.net
It must have been a fluke...I can't get the YE drive to operate reliably
either. The drive won't recal consistently. I might try lengthening the HL
time in software and then give it another shot.
I may have to have to stick with the Teac drive and figure out a way to
control the heads by software.
The fact that it works some time seems to indicate that you need
to add some delay. For longer delays, most have a call to a delay
routine. Look for a seqence of dec jnz dec jnz.
Dwight
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