HP 30240A Installation And Service Manual page 51

Table 4-1. Self-Test LEDs and Subtest Descriptions
Maintenance
CODE
LED
INDICATION
HEX
NO.
H I
J K
L M N
*
SUBTEST DESCRIPTION
1
0 0 0 0 0 0 1 1 Z-80
Instruction set
2
0 0 0 0 0 1 0 1
EPROM Checksum
3 0 0 0 0 0 1 1 1
Station Address PROM Checksum
4 0 0 0 0 1 0 0 1
High Byte Latch
5 0 0 0 0 1
o
1 1
Byte RAM Data Even addresses
6 0 0 0 0 1 1 0 1
Byte RAM Data
Odd addresses
7 0 0 0 0 1 1 1 1
Byte RAM Address Incrementing addresses
8
o
0 0 1 0 0 0 1
Byte RAM Address Decrementing add resses
9
o
0 0 1 0 0 1 1
Word RAM Address tests
-
A
o
0 0 1 0 1 0 1
Word/Byte Address Address mapping
B
o
0 0 1 0 1 1 1 Z-80
Memory reference inst ruct ions
C
o
0 0 1 1 0 0 1
MDIAG register Proper state after reset
SYSCON register
D
o
0 0 1 1 0 1 1
CTC Data test
E
o
0 0 1 1 1 0 1
CTC fv10de
0
counting
..
-
F 0 0 0 1 1 1 1 1
CTC Mode
2
counting
10 0
o
1 0 0 0 0 1
eTC Mode
4
counting
--
11 0 0 1 0 0 0 1 1
Interrupt PAL Bit 4 set and cleared
_.-
12
0 0
1
0 0 1 0
1
Z-80
interrupt
13 0 0 1 0 0 1 1 1 Z-80
NMI Non-Maskable Interrupt
14 0 0 1 0 1 0 0 1
MHSDIS
DMA Handshake Disabled
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