Well, it's interesting you say that. The Disk 1 has the provision to leave
the motor running permanently or to put it under software control (it has to
do with sharing an I/O bit on the internal serial port). Right now, it's
strapped to run all of the time. The monitor ROM (which includes a CBIOS)
doesn't have montor_on code.
The drives are strapped for their respective DS (0 for drive 0, etc.). In
addition to a Teac FD55GFR, I've tried a YE-Data YE-380 drive (from a PC/AT)
which has HM and HS (head-on-motor and head-on-select) signals -- its set
for HM.
On 1/12/08 7:22 AM, "Alexandre Souza" <alexandre-listas at
e-secure.com.br>
wrote:
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?
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