Programming instructions

instruction transfers the lower six rows (4, 5, 6, 7, 8, and 9). The mode is
specified with the Card Read Select instruction. The mode can be changed
while the card is being read.
0 20 40 60
80
10 MS
908120 140 160 180 200 220 240 280 298~00
CRSA
&B
I
Card 15 psec
Card
Reader
Flag
CRRB
Next CRSA Or CRSB Cm Be Qiven
u
U
300 ~sec
80-Column Ready Signals
Every 2.3
MS
i
I
804RRB Each Command
Clears Cd Flag
Figure 24 - Card Reader timing
MB,“, (Alphanumeric)
CARD
READER
CONTROL
Figure 25 - Card Reader programming logic