HP 4262A - Page 95

Section IV
Test Program 3
Model 4262A
PERFORMANCE TESTS
4-28
TEST PROGRAM 3
[PURPOSE]
This test verifies that 4262A notifies system controller of the Request Status (RQS)
and that demands of the Service Request (SRQ) are processed according to pro-
grammed service routing.
[PROGRAMMING]
prt "MEASURED DATA RECEIVED
oni 7,"SRQ"
rem 7 1)
cli 7
clr 717
wrt 717,"H3D1T3";wait 1000
trg 717
"LOOP":eir 7,128
if bit(0,B)=1l;g9to "READ"
OJOUTd
WO
e
00
o
9: gto "LOOP"
10: "SRQ":rds(717)+8 5)
11: if bit(6,B)=1;jmp 2
12: prt "OTHER DEVICE SRQ";spc 3
13: "IRET":eir 7,128
14: iret
15: "READ":red 717,A,B
16: flt 3;prt "LCR DATA=",a,
"DQ DATA=",B 7)
17: spc 3
18: end
*22913 8)
10)
11)
-DATA READY RQS MODE";spc 3
Designates label (SRQ) for service routing to be
performed when an interrupt is set by a device
on select code 7 Bus Line.
Addresses calculator to talk and 4262A to listen.
Program code string set device: TEST SIGNAL
10kHz, Data Ready RQS Mode to ON (ref to
Para 3-70), and TRIGGER to HOLD/MANUAL.
Labels LOOP. Enables Service Request to be
sent from device on select code 7 Bus Line.
Checks status of SRQ line on the Bus Line.
If the last bit of Status Byte (corresponding to
Data Ready — ref to Para 3-70) is 1, goes to pro-
gram step 15 labeled READ.
Note
When status of the SRQ line becomes
1, the programming sequence phase
changes from cycling through steps 7,
8, and 9 and successively goes to step
10. Steps 10 through 14 comprise the
service routing to process interrupt
(Service Request) phase. See Figure
4-11 for programming flow diagram.
Labels SRQ. Takes Status Byte responding to
serial poll of calculator and stores data in regis-
ter B.
Verifies that SRQ YES/NO line of Status Byte is
actually 1 (ref to Para 3-70).