Tandy 1000 HX Technical Reference Manual page 367

3.3 Signal Definitions
3.5 Power on and Power off Requirements
3.5.1 Data Protection
3.5.2 Power Supply Sequencing
3.6 Disk Motor Rotation and Disk Insertion.
3.7 Power-On Reset Timing
4. Safety
5. Power On Initialization
6. Test Points
Page 3
3.4 Timing Requirements
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
3.3.6
3.3.7
3.3.8
3.3.9
3.3.10
3.3.11
3.3.12
DRIVE SELECT 0,l
f
2
f
3
MOTOR ON
STEP
DIRECTION
HEAD SELECT
WRITE GATE
WRITE DATA
INDEX
TRACK 00
WRITE PROTECT
READ DATA
DISK CHANGE
3.4.1
Head Access
3.4.2 TRACK 00 Signal
3.4.3 Write Data Timing
3.4.4
3.4.5
3.4.6
Read Data Timing
Index Pulse
Disk Change