First post, by elianda
I recently got two TEAC YG-437F 5.25" disk drives that were used as Robotron KS5601.
From the documentation I could find at www.mpm-kc85.de/html/D004FDDrive.htm the drive is 80 tracks double sided.
Since I don't have a KC85 any more I wanted to test the drive on a regular PC.
So I jumpered both to DS1, but ran into another problem. The IBM/PC interface wants on Pin34 the Disk Change (DC) signal, whereas the Shugart Interface has Drive Ready (RY) there. The drive has no sensor for DC and does not support DC. The only other option beside RY is to jumper XT, which sets the signal on pin 34 permanently on HIGH.
Jumpered to RY I get in MS-DOS 'drive not ready' which is somehwat expected.
Jumpered to XT the drive seems to work as 360K drive.
Set to 1.2 MB type in BIOS formatting fails with 'Error on Track 0'. I suspect this has something to do with pin 2 which is disk change detect on shugart and density select on IBM/PC?!?
Someone with a bit more knowledge of drives can explain me what is going on?
e.g. why does the drive when jumpered to XT works as DD but not as HD? Can it be operated without DC signal on a IBM/PC or does it induce other issues?
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