Write Current - IBM 5170 Technical Reference

Head Geometry: See
I
High Capacity Diskette Drive
I
earlier in
this section.
Diskette Change Signal:
Copy protection may not be able to
reset this signal.
~
Write Current
The IBM Personal Computer AT Fixed Disk and Diskette Drive
Adapter selects the proper write current for the media being used.
Machine-Sensitive Code
Programs may program for machine specific features, but they
must test for specific machine type. Location hex OFFFF:OE
contains the machine identification:
Hex
Machine Identification
OFF IBM Personal Computer
OFE IBM Personal Computer XT
OFD
IBM pejr
OFC
IBM Personal Computer AT
Machine Identification Code
IBM will define methods for uniquely determining the specific
machine type or
I/O
feature for any new device.
Compatibility 9-23