Indy 400/800

indy.c1 = car prom 82s115
indy.c2 = car prom 82s23b (read as a national 74s188)
indy.s1 = sync prom 82s129 (read as a national 74s287)
indy.s2 = sync prom mmi-6331-1j (read as a national 74s288)

indy1.bmp is graphics dump of the .c1 prom
indy2.bmp is graphics dump of the .s1 prom

re-read using correct chips
indy 800 sync board
.e5	mmi6331		stamped 5502	read as 82s123	looks like this is the indy 4 sync and not the indy 800
.f4	n82s129ba	stamped 5503					looks like this is the indy4 track and not the indy 800 track

car board
.k4	n82s23b		stamped 3187