as stated in the service manual the U3 eprom is a 2716 type. so capacity is 2kB (000-7FF) the "single cpu" eprom files "6502" and "540344r1.1.6800" are 1kB (000-3FF) and probably they have been extracted from the original 2716 eprom and should be doubled in order to fill a 2716 and not having to mess with jumper on the A10 line. so try with the file "6502" doubled and burned onto a 2716, it should work with either jumper W4 or W3 set. you should have the same effect using "540344" file and setting the jumper W4/w3 according to service manual. make sure your 6502 supports 2Mhz speed (maybe selftest clock is slower... but who knows ?) service manual is here http://arcarc.xmission.com/Test%20Equipment/Fluke/PDFs/6502Pod.pdf ----- Original Message ----- From: Theron Troxel Sent: 01/02/14 11:43 PM To: John Doe, Technical Tools Mail List Subject: Re: [Techtoolslist] 6800 to 6502 pod combo ROM? Thanks for the help. The eprom I have in there is labeled 540344 U3 1.1. I tried comparing checksums with it and the three links above, and none of them matched. I assumed this was the dual boot, and that's why I didn't change it out. Is the 6502 the best one to use if converting? Do I just burn this to a 2716 or do I have to double the image first? Thanks again. On Thursday, January 2, 2014 2:57 PM, John Doe <zabanitu@mail.com> wrote: here is a tutorial: http://forums.arcade-museum.com/showthread.php?t=217476 grab eprom files here: http://arcarc.xmission.com/Test%20Equipment/Fluke/6800pod/ file "6502" is for a 6502 pod file "540344r1.1.6800" is for a 6800 pod file "540344" should be used for "dual boot" pod. try and let us know. Zab ----- Original Message ----- From: Theron Troxel Sent: 01/02/14 09:28 PM To: Technical Tools Mail List Subject: Re: [Techtoolslist] 6800 to 6502 pod combo ROM? I went back and double checked my work on cut traces and jumpers and didn't see any errors. I replaced the 6800 with a 6502a, and tied pin 19 to VCC. Can I use the original ROM in the 6800 POD? If so, is it more than just tying pin 19 to VCC? Thanks again! On Sunday, December 29, 2013 7:27 PM, Rodger Boots <rlboots2@gmail.com> wrote: 6502P would be 1MHz in a plastic case. 6502A is a 2 MHz part (needed especially for vector games). On Dec 29, 2013 6:53 PM, "Troxelone" <troxelone@yahoo.com> wrote: > Is there a difference between a 6502a and a 6502p? I took a 6502p out of > my working Centipede PCB and put it in the pod. > > > > > On Dec 29, 2013, at 6:32 PM, Rodger Boots <rlboots2@gmail.com> wrote: > > > > REALLY stupid question, but you did also replace the 6800 with a 6502. > _______________________________________________ > Techtoolslist mailing list > Techtoolslist@flippers.com > http://seven.pairlist.net/mailman/listinfo/techtoolslist > FTP site is: ftp://ttl.arcadetech.or g/TTL/Test_Equipment > Archive site: http://seven.pairlist.net/pipermail/techtoolslist/ > _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com http://seven.pairlist.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/ _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com http://seven.pairlist.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/ _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com http://seven.pairlist.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/