02-24-2020, 08:24 PM
I am troubleshooting a TRS-80 floppy drive controller and the test procedure calls for me to:
I found the recent thread on Alignment floppies in general https://www.cbmstuff.com/forum/showthread.php?tid=646 and understand that I wouldn't be able to recreate such a floppy in full, but I'm wondering if I can specifically write just the specific test pattern this calls for.
Since it seems to just be a constantly repeated pattern, I thought maybe I could just write all the same byte to a raw 360KB file disk image and then convert that to a floppy with SCP. But I'm a little confused as to what byte that would be — it calls it a "125kHz (2F) pattern" but the value expected to be read out is FFh rather than 2Fh.
Quote:Insert a diskette that [h]as a 125kHz (2F) pattern on track 00 into the Disk Drive and close the door. NOTE: The Dysan 224/2A Analog Alignment Diskette has a 125kHz pattern on track 00. The program will turn On Drive 1, set the head to track 00, continuously read the track and display the number that is read, which should be 255.
I found the recent thread on Alignment floppies in general https://www.cbmstuff.com/forum/showthread.php?tid=646 and understand that I wouldn't be able to recreate such a floppy in full, but I'm wondering if I can specifically write just the specific test pattern this calls for.
Since it seems to just be a constantly repeated pattern, I thought maybe I could just write all the same byte to a raw 360KB file disk image and then convert that to a floppy with SCP. But I'm a little confused as to what byte that would be — it calls it a "125kHz (2F) pattern" but the value expected to be read out is FFh rather than 2Fh.