Black Matrix
Well-known member
Hey all,
I just acquired a Major Havok board and its going to be more of an easter egg hunt than a repair job. I count 16 empty IC sockets. I thought someone on here who has a Major Havoc could fill in the missing info. So here is the list and what I can gather from the parts manual I found online.
1H/J Static Ram 24pin
1J/K Static Ram
1L 27128 Eprom 200ns 28pin
1M/N 27128 Eprom 200ns
1N/P 27128 Eprom 200ns
1Q 27128 Eprom 200ns
6H 27128 Eprom 300ns
6J/K 27128 Eprom 300ns
6K/L 2764 Eprom
6L/M Static Ram
6M/N Static Ram
7E/F 27LS279 Integrated Circuit 40pin (CORRECTION: actually listed as a 74LS279)
9P/Q Static Ram
9Q/R 2804 Eprom
9S 27128 Eprom 300ns
13Q Custom Integrated Circuit 40pin
Also I need to know what is in VR-1 and VR-4. Should be a couple transistors
VR-1 is supposed to be 7815
And VR-4 may not be used.
So here's my questions.
1. What kind(s) of static Ram is used in these and what is the best substitute if its hard to get.
2. Is the custom IC at 13C available from anywhere. Thought someone may have reproduced a substitute or know of another game that also uses it.
3. How many chips Rom chips are used on this game. By my count, its 9.
4. Anyone know a cheap source for a rom set.
Any insight would be appreciated. Thanks in advance.
I just acquired a Major Havok board and its going to be more of an easter egg hunt than a repair job. I count 16 empty IC sockets. I thought someone on here who has a Major Havoc could fill in the missing info. So here is the list and what I can gather from the parts manual I found online.
1H/J Static Ram 24pin
1J/K Static Ram
1L 27128 Eprom 200ns 28pin
1M/N 27128 Eprom 200ns
1N/P 27128 Eprom 200ns
1Q 27128 Eprom 200ns
6H 27128 Eprom 300ns
6J/K 27128 Eprom 300ns
6K/L 2764 Eprom
6L/M Static Ram
6M/N Static Ram
7E/F 27LS279 Integrated Circuit 40pin (CORRECTION: actually listed as a 74LS279)
9P/Q Static Ram
9Q/R 2804 Eprom
9S 27128 Eprom 300ns
13Q Custom Integrated Circuit 40pin
Also I need to know what is in VR-1 and VR-4. Should be a couple transistors
VR-1 is supposed to be 7815
And VR-4 may not be used.
So here's my questions.
1. What kind(s) of static Ram is used in these and what is the best substitute if its hard to get.
2. Is the custom IC at 13C available from anywhere. Thought someone may have reproduced a substitute or know of another game that also uses it.
3. How many chips Rom chips are used on this game. By my count, its 9.
4. Anyone know a cheap source for a rom set.
Any insight would be appreciated. Thanks in advance.
Last edited:

