Nama
Veteran Member
Great news!. Finally no more reliance on 5.25" hard sectored media!
Over a year ago I got one of Chris Elmquist HSFE's (http://sebhc.lesbird.com/storage/storage.html) which he designed for use with a Heathkit H-8 system. My first attempt at getting this working in my SOL-20 with Northstar controller card was unsuccessful. Last night I spent quite some time working through all the DIP switch settings and using Dave Dunfield's NST util (with Corey's modified SOL-20 stub) to write disks. After finding a setting that allowed writing with no errors, I then read the disk back and compared it to the origin disk image. Again this took some playing around, but finally I was able to find a setting that allowed me to both read and write....and ultimately boot both CP/M and Northstar DOS on my SOL-20 (+ Northstar controller) with regular non hard sectored media on my 5.25" drive. Chris himself said that 5.25" drives can be unreliable with the HSFE as it was designed primarily for 3.5" disk usage. Although I have not used this setup for any extended period of time, I have yet to see any flakiness with my 5.25" drives.
One problem still persists though. The HSFE was designed for the Heathkit H-8 system which uses the drive selects differently than the Northstar floppy controller. Although a single drive setup works, I know that the pins and drive selects are actually a little whacky. Unfortunately this means that a two drive setup does not presently work. After talking to Chris and studying the schematics, I believe I can get it to work by cutting a single trace on the HSFE, and adjusting the shunts on Drive 1. I'm hoping for confirmation from Chris before I go ahead and do this, as cutting traces is not something I do lightly.
Once I get my two drive setup running I'll post the final settings and instructions as it may be useful to others.
I'm sure this will also work on other machines such as the Northstar Horizon (and possibly others too).
Phil
Over a year ago I got one of Chris Elmquist HSFE's (http://sebhc.lesbird.com/storage/storage.html) which he designed for use with a Heathkit H-8 system. My first attempt at getting this working in my SOL-20 with Northstar controller card was unsuccessful. Last night I spent quite some time working through all the DIP switch settings and using Dave Dunfield's NST util (with Corey's modified SOL-20 stub) to write disks. After finding a setting that allowed writing with no errors, I then read the disk back and compared it to the origin disk image. Again this took some playing around, but finally I was able to find a setting that allowed me to both read and write....and ultimately boot both CP/M and Northstar DOS on my SOL-20 (+ Northstar controller) with regular non hard sectored media on my 5.25" drive. Chris himself said that 5.25" drives can be unreliable with the HSFE as it was designed primarily for 3.5" disk usage. Although I have not used this setup for any extended period of time, I have yet to see any flakiness with my 5.25" drives.
One problem still persists though. The HSFE was designed for the Heathkit H-8 system which uses the drive selects differently than the Northstar floppy controller. Although a single drive setup works, I know that the pins and drive selects are actually a little whacky. Unfortunately this means that a two drive setup does not presently work. After talking to Chris and studying the schematics, I believe I can get it to work by cutting a single trace on the HSFE, and adjusting the shunts on Drive 1. I'm hoping for confirmation from Chris before I go ahead and do this, as cutting traces is not something I do lightly.
Once I get my two drive setup running I'll post the final settings and instructions as it may be useful to others.
I'm sure this will also work on other machines such as the Northstar Horizon (and possibly others too).
Phil
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