Beehive International B102 Service Manual page 92

MAIN ART CLK - Main UART Clock - Clocl< at 16 tinries the baud rate; main timing clock for transmit and
receive
MAX ROLL - Maximum Roll - Register count equals 23; will automatically reset roll register
MEMORY SHIFTER —Name given to set of registers which do memory shift in insert/delete operations
MODE 0, 1 —Mode Zero, Mode One - State for PLAS; 15 sequences exist in Mode 0 and 15 oper3tions of 15 sequences
each exist in Mode 1
MR - Master Reset - Input to UART to do a reset of the UART device
NULL SUPPRESS —Name of circuit which decodes a Null on the bus and suppresses transmission of same
OPN 1-4 - Operation Inputs 1, 2, 3, 4 - Binary value of each input: Input 1-"I, Input 2=52, Input 3=4, Input 4-8.
If operation 1—4 all equal a high operation 15 is decoded
PE - Parity Error - Unused output of UART which flags wrong parity receipt to the terminal
PROG LD ART - Program Load UART - Signal which loads the UART with characters from screen for block
transmission
PROT BIT —Protect Bit - Signifies bit in memory which stores protected data fields -for formated display
ROLL REGISTER —This is the register which is incremented in a Roll function (scroll)
SELECTED CLK - Selected Clock - Signifies 1 of 2 clock (baud) rates to be input to UART, either main port or
auxiliary port rate.
SEND DATA - Transmit data line on main port
SET BEEP — Command which will fice bell one shot to give an audible alarm
ST - Strobe - This is the main timing strobe of the unit; all decodes and memory inputs are timed to strobe.
THRE - Transmitter Holding Register Empty
THRL - Transmitter Holding Register Load
TF^ 1-8 —Transmitter Receiver Input/Output bits 1 through 8
TRC —Transmitter Register Clock
TRE - Trpnsmitter Register Empty
TRO - Transmitter Register Output
UART -T- Universal Asynchronous Receiver Transmitter (Transmit/Receive)
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