Total loop length: 230mm Belt width: 2mm Belt thickness: 0.5mm
I'm a little late but since this seems to be the only thread discussing the OSDA-53B pinout I think it should go here. I have been trying to hook up a regular laptop floppy drive to the Compaq LTE Lite laptops and found that connecting all the signals up directly is resulting in damaged drives, it does work though! Your pinout listed here was instrumental in me hooking a regular Teac FD05HG floppy in place of the Citizen VIDA-15B drive and it did work with 1.44MB floppies but when I tried a 720K disk the drive broke and will now only read DD disks not HD. So a couple of years ago I got a Compaq OSDA-53B desktop floppy drive which had an adapter board attached to connect it up to a standard 34-pin edge connector type floppy cable - here are the results (whether or not signals are active_low is not : 1 GROUND 2 STEP 3 GROUND 4 WRITE_DATA 5 GROUND 6 WRITE_GATE 7 GROUND 8 TRACK_0 (VIA 7407 & 2.7K 5V PULL-UP) 9 N/C 10 WRITE_PROTECT (VIA 7407) 11 GROUND 12 READ_DATA (VIA 7407 & 2.7K 5V PULL-UP) 13 GROUND 14 HEAD_SELECT 15 N/C 16 DISK_CHANGE (VIA 7407 & 2.7K 5V PULL-UP) 17 DENSITY_SEL 18 5 VOLTS 19 MEDIA (VIA 7407 & 2.7K 5V PULL-UP + JUMPER AT EDGE CONNECTOR) 20 INDEX (VIA 7407 & 2.7K 5V PULL-UP) 21 5 VOLTS 22 DIRECTION 23 N/C (SHOULD BE DRV_SEL_A BUT IS NOT ROUTED) 24 DRV_SEL_B 25 MOTOR_EN_A 26 MOTOR_EN_B The output signals from the floppy drive go through a 7407 before being output to the 34-pin floppy cable. The pinout matches up with what's listed here: https://eab.abime.net/showthread.php?p=1442154