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Installing the CPTM-01
2
Table 2-5. Signal Descriptions for the CPTM-01 Backplane Connector (J4)
Signal
Signal
Mnemonic
Signal Description
Floppy Disk Drive
DSKCHG-
Indicates drive door is open
DIR-
Controls direction of the head during step operations
DRVDENS[1:0]
Disk density select communication
DS[1:0]-
Drive selects
HDSEL-
Selects top or bottom side head
INDEX-
Indicates the beginning of a track
MTR[1:0]-
Motor enables
RDATA-
Data read
STEP-
Step, pulses move head in or out
TR0
Indicates that head is positioned above track 00
WDATA-
Write data to drive
WGATE-
Enables head write circuitry of drive
WPROT-
Indicates a disk is write-protected
Parallel LPT Port
ACK-
Pulsed by peripheral to acknowledge data sent
BUSY
Indicates that the printer cannot accept more data
ERR-
Peripheral detected an error
PD[7:0]
Parallel data lines, bits 7- 0
PE
Paper end, indicates printer out of paper
AFD-
Auto feed, causes printer to line feed
INIT-
Initializes the printer
SLIN-
Select in, selects the printer
STB-
Data strobe, indicates data is valid
SLCT
Select, peripheral indicates it is selected