Advice for a recalcitrant 29c

[[kby]]

(06-06-2019 01:15 PM)rprosperi Wrote:  Though I am well over my head even commenting here, it may be relevant that Panamatik pointed out in a different thread only a day or two ago that the 29C (unlike other Woodstocks) stores its X register in the RAM chip, so perhaps the RAM chip is bad; that seems consistent with some of the symptoms described, if I am following your discussion.

Thanks for the suggestion. The service manual calls the RAM areas “DS” (Data Store?) and DS 2nis the one that holds x.

This would make sense for any “C” machine as x has to be part of the Continuous Memory and therefore must be in a CMOS RAM area as the ACT would presumably not be powered when the machine is off.