Replaced 2 8xx customs and 1 7xx custom with leg rot. Replaced all the 24, 28, 40, and 42 pin sockets, then replaced all the old style, unencapsulated resistor packs.
#Bosconian arcade rom driver
Installed 3 missing sound ROMs, replaced a video ROM with bad leg rot, installed a missing audio amp chip, and a missing coin counter driver transistor, installed 4 correct standoffs, and replaced the ribbon cable to finish the board and tested successfully. Replaced 7 missing program ROMs, 2 missing 8xx customs, 1 missing 6xx custom, 1 7xx custom with bad leg rot, 1 missing 5xx custom, Installed 3 missing resistor packs, 1 missing 74LS368, and a missing video PAL. Replaced all 24, 28, 40, and 42 pin sockets and 3 of the old style resistor packs. Now it can be plugged into the socket to take the place of a bad 9316B without having to restrap the board. Take a piece of Kynar wire and jumper from pin 21 to pin 24 (+5v) to tie the PGM pin to +5v. To modify the 2716 EPROM, program it first, then bend pin 21 out parallel with the chip body and cut it short. The 2716 requires pin 21 to be tied high and on the 9316B it is tied low. For 9316B you can either replace it with a 2732 with the image stacked in the ROM (0-7FF and again from 800-FFF) or with a 2716 EPROM that has been modified. If you want to replace 1 tri-voltage ROM, well, you either better be able to program a replacements (I can.) or go back to option 1. Extreme care must be taken to not apply +12v and -5v to a standard EPROM or 9316 mask ROM so double check everything if you're doing the strapping on your own.Ģ. Also, I've seen three different revisions of the board where the strapping points are different.
I know from revision F and earlier the ROM selects go to different pins. This can be difficult as there are many different revisions of the board. This is good if you're replacing all of the tri-voltage ROMs (2708 or TMS2716) or 9316B mask ROM. In other words, change the jumpers to change what type of ROMs you are using.
#Bosconian arcade rom series
When replacing mask ROMs or EPROMs on a Midway 8080 series board you have some optionsġ. > Channelmaniac's Arcadecomponents' Old School Repair Logs Midway Games NLG Users Repair Logs and Other Ramblings.
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