Hey all, I recently was given a Kaypro 4 Plus 88 machine in good working order. It boots and runs CP/M and DOS just fine from drive A. Drive B, however, is another story.
Symptoms:
- Can sometimes display a directory listing from original Kaypro disk
- 1/10 chance that original copy of Wordstar will load to the title screen but never gets past that point
- Can format and verify a blank disk
- Cannot display the directory listing of a disk it just formatted (just spins)
What I have done:
- Cleaned read/write heads with cotton swab and IPA
- Cleaned and lubricated drive rails
- Ensured stepper motor moves through its range during format operation
- Calibrated motor speed for 60hz mains power
- Swapped cable around so drive B was using drive A's connector
Any suggestions what I should try next? Scratching my head here because it seems to work correctly when formatting and verifying but seems to have a lot of difficulty reading.
Thanks!
Symptoms:
- Can sometimes display a directory listing from original Kaypro disk
- 1/10 chance that original copy of Wordstar will load to the title screen but never gets past that point
- Can format and verify a blank disk
- Cannot display the directory listing of a disk it just formatted (just spins)
What I have done:
- Cleaned read/write heads with cotton swab and IPA
- Cleaned and lubricated drive rails
- Ensured stepper motor moves through its range during format operation
- Calibrated motor speed for 60hz mains power
- Swapped cable around so drive B was using drive A's connector
Any suggestions what I should try next? Scratching my head here because it seems to work correctly when formatting and verifying but seems to have a lot of difficulty reading.
Thanks!