Specifications

B–2
Abbreviations, Acronyms, and Signal Mnemonics
COLL Collector. . . . . . . . . . . . .
COM Communication to Hammer Drivers. . . . . . . . . . . . .
COM1 COM Data Line Optically Isolated. . . . . . . . . . . .
COMOUT COM Data Output to Next H.D.. . . . . . . . .
CTS Clear to Send. . . . . . . . . . . . . .
DB1, 2, etc. Data Bit 1, 2, etc.. . . . . . . .
DBA1–23 Buffered Address 1–23. . . . . . . . . .
DBD0–15 Buffered Data 0–15. . . . . . . . . .
DCD Data Carrier Detect. . . . . . . . . . . . . .
DCMOD DC Motor Modulation. . . . . . . . . .
DCUDATA DCU Data Ready for MCU. . . . . . . . .
DEC Decode. . . . . . . . . . . . . .
DEL Delete Code Detected (Parallel). . . . . . . . . . . . . .
DELEN Delete Code Detect Enable. . . . . . . . . . .
DMA Direct Memory Access. . . . . . . . . . . . .
DPMC Dot Plucker Memory Controller. . . . . . . . . . . .
DPU Data Processing Unit. . . . . . . . . . . . . .
DRAM Dynamic Random–Access Memory. . . . . . . . . . . .
DRQ Data Request. . . . . . . . . . . . . .
DRQPOL Data Request Strobe Polarity. . . . . . . . . .
DRQSTB Data Request Strobe. . . . . . . . . .
DS Data Strobe. . . . . . . . . . . . . . .
DSR Data Set Ready. . . . . . . . . . . . . .
DSRET Data Strobe Return. . . . . . . . . . . .
DTR Data Terminal Ready. . . . . . . . . . . . . .
DUART Dual Universal Asynchronous Receiver/Transmitter. . . . . . . . . . .
ENC Encode. . . . . . . . . . . . . .
EXTCLK External Clock. . . . . . . . . .
FIRE0–2 Hammer Fire 0 to 2. . . . . . . . . . .
FL Floppy Drive. . . . . . . . . . . . . . . .
FLT Fault. . . . . . . . . . . . . . .
FP Front Panel (Control Panel). . . . . . . . . . . . . . . .
FTIC Fire Timer Integrated Circuit. . . . . . . . . . . . . .