4054 in Sacramento

[Monty McGraw]

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 <mmcgraw74 at 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 at 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
>>
>