mjenison
Well-known member
Hi all,
I know traditionally people have said that the Exidy 440 boards can't have their roms swapped due to board changes.
However, I was looking at the MAME source and it seems the hardware changes needed to make one Exidy 440 boardset into another may already be well documented...
http://mamedev.org/source/src/mame/drivers/exidy440.c.html
This post here seems to confirm that it is possible:
http://www.gamesforum.ca/showthread.php?t=7485
So, looks like, for most cases, chips just need to be swapped out:
74LS244->74LS240 (18J main board)
74LS367->74LS368 (1A audio board)
74LS128-> ? (74LS32?) (2A audio board)
I'll check my Showdown PCB to what chips I have at these locations.
If you have an Exidy 440 PCB, please post what chips you have at these locations, and any mods that might implement the other changes mentioned in the mame source.
I know traditionally people have said that the Exidy 440 boards can't have their roms swapped due to board changes.
However, I was looking at the MAME source and it seems the hardware changes needed to make one Exidy 440 boardset into another may already be well documented...
http://mamedev.org/source/src/mame/drivers/exidy440.c.html
This post here seems to confirm that it is possible:
http://www.gamesforum.ca/showthread.php?t=7485
So, looks like, for most cases, chips just need to be swapped out:
74LS244->74LS240 (18J main board)
74LS367->74LS368 (1A audio board)
74LS128-> ? (74LS32?) (2A audio board)
I'll check my Showdown PCB to what chips I have at these locations.
If you have an Exidy 440 PCB, please post what chips you have at these locations, and any mods that might implement the other changes mentioned in the mame source.


