I received my System 80 yesterday and have spent most of the morning opening it up and cleaning/checking everything. I also ended up having to build a video cable for it (forgot it used a DIN rather than RCA plug!)
Now I have run into a problem. When you power it up it displays "REEDY>" and then a heap of dollar ($) signs around the screen. The dollar signs are actually in a neat series of rows which I assume points to either a video ram or a character generator problem. Typing on the keyboard results in characters being put onto the screen, but not always the one you type. For example I might type 'A" and get 'F" or I might type 'G' and get 'G".
I then touchtyped in a simple basic program that loops and counts from 1 to 9. The program executes fine, however you dont get 123456789 - more like 12gh58789.
EDIT: Added more photos. It appears that it has some extra video RAM that has been piggybacked. Pictures tell the story there.
EDIT2: Should also mention I have reseated all RAM and socketed IC's on the boards.
Do you think its video ram or the character rom or something else? I have an eeprom burner so I can program a character rom (however I need the image for it).
Last edited by 3pcedev
on Sat Jul 11, 2015 7:42 pm, edited 1 time in total.