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Tube🍂Time
13 comments
Tube🍂Time replied to Tube🍂Time

now it beeps and the display lights up! it's alive.
27 Feb 2023 at 1:25 | Open on mastodon.social
Sergio Aguayo replied to Tube🍂Time

@tubetime What would've been the purpose of the MM to 45 jumper then?

27 Feb 2023 at 3:08 | Open on cs.social
Tube🍂Time replied to Sergio

@sergioaguayogr the memory in the 6532 is used as a vector table. it's nice to protect it from accidental modification by a runaway program, so MM to 45 is a write protect function.

27 Feb 2023 at 4:41 | Open on mastodon.social
Tube🍂Time replied to Tube🍂Time

another day, another dead SYM-1.
7 Mar 2023 at 15:49 | Open on mastodon.social
Tube🍂Time replied to Tube🍂Time

seems to be a similar issue. when it tries to jump to outvec+1 (previously stored in the 6532's RAM) it goes to 0000 instead of the actual character output routine
7 Mar 2023 at 16:10 | Open on mastodon.social
Tube🍂Time replied to Tube🍂Time

pin 11 of this inverter is shorted to ground. this is the exact same problem as the last SYM-1!
7 Mar 2023 at 16:20 | Open on mastodon.social
Tube🍂Time replied to Tube🍂Time

so strange. different manufacturers and exactly the same failure (~20 ohm short from pin 11 to ground). must be damage caused by something the last owner did.
7 Mar 2023 at 16:34 | Open on mastodon.social
Joe Pasqua replied to Tube🍂Time
bitsavers.org replied to Tube🍂Time

@tubetime

woot!
at one point I had a SYM/KTM. The editior/assembler firmware is under bitsavers.org/pdf/synertek/sym

8 Mar 2023 at 3:31 | Open on oldbytes.space
Joviko Wi replied to Tube🍂Time

@tubetime

Redid the sketchy solder on R83 too. Nice!

27 Feb 2023 at 1:57 | Open on universeodon.com
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