[sebhc] H89 diskette drive

Carroll Waddell carrollwaddell at sc.rr.com
Sun May 13 20:26:27 CDT 2007

Yes, it's the hard sector adapter.

Barry Watzman wrote:

>Which adapter?  If it's a hard sectored adapter (the -17 series), the "disk
>controller" is just a UART.
>-----Original Message-----
>From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of
>Carroll Waddell
>Sent: Sunday, May 13, 2007 20:19 PM
>To: sebhc at sebhc.org
>Subject: [sebhc] H89 diskette drive
>I got my H89 CPU board repaired and working. I am having trouble with 
>the diskette boot. When I enter B (ENTER) to boot from the primary, the 
>drive runs for a few seconds then the screen says BOOT?
>I have 2 diskette adapter boards, and I've tried them both. Same thing. 
>I've tried different drives. Same thing. I have attempted to boot both 
>CP/M and HDOS. Same thing. I'm sure my diskettes are ok because both 
>HDOS and CP/M boot fine on my H8.
>I connected my scope to the Read Data line coming from the drive. When I 
>try to BOOT, there is activity on the READ DATA line. I checked the READ 
>DATA going into the UART.
>Different drives - Different diskette adapters - Different Diskettes - 
>Different OS's. What am I missing?
>I don't have much printed information about how this adapter works, and 
>no troubleshooting procedures or waveforms that I can look at. I checked 
>the rotational speed and it is correct.
>Anyone have any ideas?
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