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Tube❄️Time

now it beeps and the display lights up! it's alive.

11 comments
Sergio Aguayo replied to Tube❄️Time

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

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.

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

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!

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.

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

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