KERNAL
TEST
-
ROM VERIFICATION
(Cont.)
V.
Measurements
A.
Use U1202, data buffer, pins 11-18 to take signatures. (This test assumes that address and
data lines are good out to the ROMs).
SA
501
C
ROM
D
ROM
E
ROM
F
ROM
Connections
(U1201) (U 1 200)
(U1101) (U 1 1 00)
Start1 U112Opin9 U1120pin9 U1120pin7 U1120pin7
stop
Qualify U1310 pin
4
U1310 pin
5
161310 pin
6
U1310 pin
7
Signature signals
UAAP (UAAP)
CA59 (CA59)
6FC2 (6FC2)
6PF2 (483U)
H7UA (H7UA)
CH06 (CH06)
82P6 (82P6)
2C27 (OHHA)
Explanation of signatures:
The startlstop and qualify connections are given first. Use
+5
V
signature to verify correct setup. The
signatures given in parentheses are provided to locate misplaced ROMs. There are timing differences be-
tween the CIE and
DIF
ROM positions, which account for the different signatures on
+5
V.
ROM positions
C
and
E
give the same signatures for a particular ROM. ROM positions
D
and
F
will also give the same
signatures for a particular ROM, but the CIE and
D/F
signatures will not match. In summary match
+5
V
signatures to correct data signatures, i.e., match
+5
V
in parentheses to data in parentheses and
+5
without parentheses to data without parentheses.
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