Contents of the EPROM are good -sadly with these old computers surface corrosion and socket "memory" are very common as you know. Back in the day it where everything was much fresher I guess these connectivity issues were not so frequent. Now everything has surface oxidation on it and the connections in IC sockets are not that great.
Andy
Alles anzeigenDo me a favour, clear the board RAM by sys 59650,C. then
10 for I=36864 to 36870
20 poke I,0
30 next I
drop to the TIM
sys 1024
.m 9000 9200
check if the ram is 00 and FF or are there any other variations in the RAM contents...
Checking to see if this is real in RAM or interference
I tested it a little bit further now:
No interferences whatsoever!
Only with drawing (SL, DL) I get the weird dots and lines…
The more I loop one and the same line, the worse it gets, till it looks like that:
