Texas Instruments 990 - Display Screen Refresh Cycle Flowchart

J}l)\ ______ _
~ 945424-9701
(A) 1 36293
WRQ=O
RDQ=cQ
CUWRQ-:Q
CURDQ==O
MXL=1
NMEMQ=l
BEL:...:O
NO
RESET WRITE DATA STROBE
RESET READ REQUEST
NO
RESET CURSOR WRITE
RESET CURSOR READ
GATE CHARACTER ADDRESS TO MEMORY
0
DISABLE BLANK VIDEO
Figure 1-43. Display Screen Refresh Cycle Flowchart
1-71
Digital Systems Division