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   ZX81 Video Board Partslist--
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Reference Device Reference Device Reference Device
U11
U12
U13
U15
U16
U17
U18
U19
U20
U23
U24
U25
U26
U27
74HCT00
74LS00
74HC04
74HC05
74LS10
74HC32
74HC74
74HC74
74LS86
74HC32
74HC08
74HCT93
74HCT93
74HCT00
U28
U29
U30
 D1
D12-D19
C11,C20
C16,C17
C19
C21
C22,C23
C24-C29
C32
P1
T1,T2
74HC30
74LS132
74HC74
1N4148
1N4148
47pF
22pF
100pF
6.8nF *
47nF
100nF
100uF
220 Ohms Potm
BC337
J1
 J2
R12,23,44
R18,24,27
R37,38,42
R43,47
R20,30,39
R25
R28,41
R36
R40
R45,46
X1
34-Pin Con.
2-Pin Con.
10k
1k
1k
1k
330
470
47k
10M
4k7
820
6.5 Mhz

* When you have a slightly bent edge of the upper half of the display area, you can correct the problem by slightly changing C21. I had the best result with 6.8nF, so you will probably have a good picture with it as well, if you used the same ICs. If the picture is slightly off, just experiment a little with C21. (in the 4.7-10nF area)
 
 
 
 

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