Rodger Boots wrote:
At least the gates are drawn as gates and not the "military" blocks used on PSE schematics.
Destruction Derby - ChiCoin, Demolition Derby -Exidy. I have deciphered the gates a bit - there are four letters and sometimes a number at the front ... #XXXX. The first letter is the page the signal first appears, pages are lettered A, B,...Y, Z. I am going to spend some more time on Monday working out what the # and second digit refer too. You know these look a lot like Atari schematics of the same time - I am comparing Crash N Score and it appears close (comparing in my memory that is, as the DD schematic is at the shop and I only have an electronic CNS version). If the configuration is X### then it is usually a pullup (A999) generated by a 7404 gate with the input tied to ground. Gotta love working on early logic boards - get to pull out my logic clip and logic comparator, plus HP pulse generator, scope, and HP Signature voltmeter (has a frequency counter - handy for troubleshooting H & V counters). John :-#)#
John Robertson wrote:
OK, this is a real long shot, but perhaps someone here has a copy of the Exidy/ChiCoin service booklet (#8) put out by Kush N' Stuff and hasn't sent it off the City of Berwyn...man I hate old TTL schematics as drawn by Exidy/ChiCoin!
http://www.cityofberwyn.com/bronzeage/
Their schematics have small groups of ICs with labels like "5BDGC" on inputs and outputs and you nave to find the other end of it...
Currently I'm servicing a Chi-Coin Demolition Derby and wish I had more info on the nomenclature used.
John :-#(#
-- John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames) www.flippers.com "Old pinballers never die, they just flip out" _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com http://seven.pairlist.net/mailman/listinfo/techtoolslist FTP site is: ftp://ftp.flippers.com/TTL/TestEquipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/