Bob, I noticed in the last photo in the 4054A EBAY auction the 4054 was on top of a 4907 with dual eight inch floppy drives.
I checked and didn't see that 4907 being auctioned off. Monty On Wed, Feb 26, 2020 at 7:49 PM Monty McGraw <mmcgra...@gmail.com> wrote: > Bob, > > I had my 4054A display stop erasing when you press PAGE key or BASIC PAGE > command. > > I found the 4054 Parts and Schematics Service Manual on bitsavers.org at > http://www.bitsavers.org/pdf/tektronix/405x/4052_4054/070-2839-00_4054_Service_Schematics_Feb80.pdf > > I've narrowed my issue using that manual to a 74123 one-shot multivibrator > that creates a short delay for the erase to complete. I've got a 74123 IC > ordered and should get it this week. > > When I upgraded my 4054 to 4054A with an F39 option kit - the MAS board > and the IO Board were both upgraded. Those schematics aren't in the 4054 > service manual. > > Then I remembered my list of your documents at Living Computer Museum - > and there was an 4054A Update to the 4054 Parts and Schematics. > I've asked the Museum to scan the manual update and I'll post the scan - > so it can be saved on bitsavers.org too. > > BTW - I plan to exhibit my 4054A with the 4907 floppy drive system at VCF > Pacific Northwest Festival at Living Computers Museum on March 21 and 22. > > Monty > > On Wed, Feb 26, 2020 at 5:38 PM Mark Linimon via cctalk < > cctalk@classiccmp.org> wrote: > >> On Wed, Feb 26, 2020 at 01:57:24PM -0800, Bob Rosenbloom via cctalk wrote: >> > I hope I can get this one running. >> >> Good find! Good luck! >> >> mcl >> >