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SECTION IV
SOFTWARE CONSIDERATIONS
4.1
FDC-3 CARD
The FDC-3 card requires three programming steps: Drive Selection,
Drive Initialization, and Data Transfer.
The TEl, Inc. Operating
System, T/DOS Version 2.0 (or higher), performs these functions as
required for program operation.
Note that
T/DOS
Versions 2.0 - 2.XX
support a maximum of four diskette drives.
4.2
1791 DEVICE
The 1791 LSI device responds to 11 commands of four types.
Type I
cowmands cause hea.d anG/or stepper motor action.
Type II commands
read or write data fromlto a selected sector. Type III commands read
an address or data fron,
i:l.
track or write data onto a trock. The
single Type IV command controls the device's interrupt capabilities.
As stated for the FDC-3 card,
T/DOS
supplies these commands as needed
for program operation.
Refer to Appenaix A for a discussion
oE
1791 device commonds ana
stc:.tus codes.
4-1
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