Pulsar 9000 A Real Hard Disk

There are two hard disks that came with the rest of the items. One was in the drive rack and the other was stored separately. The latter was clearly marked as being TurboDOS for the 80186.

DriveLabelCapacityConfigurationSpeedStatus
Miniscribe 8425?TurboDOS 8018621MB4 Heads 615 Cylinders 17 Sectors/Track  68msBoots 7 bad sectors marked
CMS Enhancements (Kalok) KL 320 Octagon 21MB4 Heads 615 Cylinders 17 Sectors/Track  48msUntested

At least superficially, these drives appear compatible.  Neither are listed in the TurboDOS 1.4 configuration options, but there is an option for a Miniscribe with similar parameters.

Both of the disks have MFM/ST-506 interfaces.  The Pulsar 6216 has a SASI/SCSI interface.  An Adaptec 4000 adapter board converts the drives to SCSI.  The configuration program is aware of the adapter.

It was a bit of a surprise to see the machine boot from the miniscribe hard drive, as it probably hasn’t been powered for about 35 years.

It booted up to a user prompt. I was able to guess a user (accounts). It had no password, but was not privileged. It threw a few bad sector errors.

I found a post that said that TurboDOS stores its user ids and passwords in userid.sys on user 31. Unfortunately, 31 cannot be accessed without being a privileged user.  Fortunately, there were some backups on floppy disk. 

I booted up with floppy disk and then changed hard disks and copied the userid.sys file to my solid state drive. I could then have a peek:

Then I changed back to the old hard drive and was able to login as system.

Once there, Verify was used to check for and mark bad sectors:

Stat returned:

This system has disabled all floppy disk drives except A. There are two partitions on the hard disk B: and C:.

The baud rates are set to 19200 with 7,1,E.

There are 4 Z80 slaves.

There’s a fair chance that the hard disk will die. Often they power up ok to fail in the next month or so.

I tried copying the boot tracks using Boot, but the SCSI2SD drive will still not boot.  There must be a trick.

Leave a Reply

Your email address will not be published. Required fields are marked *