supercharged New member Joined Oct 18, 2010 Messages 620 Reaction score 1 Location Portland, Oregon Dec 2, 2011 #1 I am looking for a cost effective way to swap the game back or trade the eproms for the pacman eproms with speed up of course.
I am looking for a cost effective way to swap the game back or trade the eproms for the pacman eproms with speed up of course.
channelmanic Well-known member Donor 3 years: 2011-2013 VAPS Joined Apr 5, 2008 Messages 17,110 Reaction score 1,093 Location Texas Dec 3, 2011 #2 Not really a cost effective way... The fuse link PROM chips aren't particularly cheap - especially if you have to get a set programmed. To convert it back you'll need a Z80 CPU, new ROMs (or reprogram yours if they are EPROMs), and IIRC... 2 PROMs. RJ
Not really a cost effective way... The fuse link PROM chips aren't particularly cheap - especially if you have to get a set programmed. To convert it back you'll need a Z80 CPU, new ROMs (or reprogram yours if they are EPROMs), and IIRC... 2 PROMs. RJ
OP OP supercharged New member Joined Oct 18, 2010 Messages 620 Reaction score 1 Location Portland, Oregon Dec 3, 2011 #3 They are eproms but when I see boards go for 75.00 shipped it is hardly worth the effort.
Riptor Well-known member VAPS Joined Jul 10, 2007 Messages 12,078 Reaction score 144 Location Leonartown, Maryland Dec 3, 2011 #4 To change back to pac from pac plus you need a Z80, all 6 eproms and 4A/7F color proms.
channelmanic Well-known member Donor 3 years: 2011-2013 VAPS Joined Apr 5, 2008 Messages 17,110 Reaction score 1,093 Location Texas Dec 3, 2011 #5 Riptor said: To change back to pac from pac plus you need a Z80, all 6 eproms and 4A/7F color proms. Click to expand... ^^^^ This. The 4A/7F PROMs are fuse link programmable PROMs. They aren't particularly cheap.
Riptor said: To change back to pac from pac plus you need a Z80, all 6 eproms and 4A/7F color proms. Click to expand... ^^^^ This. The 4A/7F PROMs are fuse link programmable PROMs. They aren't particularly cheap.
OP OP supercharged New member Joined Oct 18, 2010 Messages 620 Reaction score 1 Location Portland, Oregon Dec 3, 2011 #6 expected cost ????
channelmanic Well-known member Donor 3 years: 2011-2013 VAPS Joined Apr 5, 2008 Messages 17,110 Reaction score 1,093 Location Texas Dec 3, 2011 #7 Generally $8 to 10 for a programmed PROM... They are different from EPROMs and are getting harder and harder to come by.
Generally $8 to 10 for a programmed PROM... They are different from EPROMs and are getting harder and harder to come by.