On Thu, Oct 18, 2018, 12:12 AM John Robertson <jrr@flippers.com> wrote:
I thought the 8031 had an option to boot externally if you tied a leg low...
Yes, _EA_ but the 8031 is supposed to be ROMless and so pin 31 should always be low. On the 8051 it's high to use onboard 4k ROM, low for external. Either way I'll check when I have time. As I said in previous message its possible it's controlled by one of the 8 dip switches but it seemed odd the chip was still marked 8031. _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/