Track 00 (Trk0*); Interface Connector Pin Assignments; Power Connector Pin Assignments - Radio Shack TRS-80 Service Manual

102
Controller-to-Disk Drive
Ground Signal Description (Mnemonic)
1 2 (Spare)
3
4 (Spare)
5 6
(Spare)
(internal) (external)
9 10 SELECT 1, 3
(DS1*) (DS3*)
11 12 SELECT 2, 4
(DS2*) (DS4*)
13 14 (Spare)
15 16 DRIVE-MOTOR ENABLE (MOTORON)
17 18 DIRECTION (DIR*)
19 20 STEP (STEP*)
21 22 COMPENSATED WRITE DATA (CWD)
23 24 WRITE GATE (WG*)
31 32 SIDE SELECT (SDSEL)
33 34 (Spare)
Disk Drive-to-Controller
Ground Signal Description (Mnemonic)
7
8
INDEX PULSE (IP*)
25
26 TRACK 00 (TRK0*)
27
28
WRITE PROTECT (WPRT*)
29 30 READ DATA (RD*)
33 34 (Spare)
TABLE 1. INTERFACE CONNECTOR PIN ASSIGNMENTS, J1 (external), J4 (internal)
Pin Supply Voltage
1
2
3
4
+12
voe
Return (+12 VDC)
Return (+5 VDC)
+5
voe
TABLE 2. POWER CONNECTOR
PIN ASSIGNMENT