Well ive done some more repairs to the board since posting the last pictures... more i dived into it the more corrosion faults i found. Ive got bits of single strand wire all over the top of this board now.
I also went to Prime Electronics here in Brisbane to get some new IC's... Jaycar are getting like Dick Smith.. i cant buy a 74ls156 there but i can if i buy one of their project kits as it comes with one... but no... is discontinued stock at Jaycar.
Prime are a bit more serious with components, but they seem to have embraced LED in a big way, so most of the shop is given over to little strings of lights which if you put a bazillion of together you get a modicum of light for general use.
Anyway... back to the point... yes they carry 74ls156.. they also had NEW 2114 RAM and have only just run out of 3081 transistor arrays... yeh go figure! So i stock up on lots of 74lsXXX for CPU and sound board.... nice big strip of IC's to take home for only $30.
I put the new IC's in place and decide to just install the board and not bench test it. CPU is disconnected from anything else... i turn her on and CPU LED comes on! For once im glad to see one of these irritating things lit up!
Now CPU is meant to flash, then LED comes on and stays on.... didnt catch the flash but hey... its on!
So feeling brave i plug in the driver board and then turn her on...
BANG BANG BANG BANG!!!!!!
All solenoids are resetting over and over... flippers flip... bumpers bump.... drops reset... all are going for reset and not stopping.
LOL_ thats as far as ive got, but im pretty pleased with myself as it does mean PROGRESS!!!!!! And im feeling optimistic that even with the amount of corrosion that there was... it may just be possible to get this machine running after all
