TI-99/4A does not print and cannot count anymore in TI Basic

[globeron]

Does someone know what can cause this? (crystal, memory, something else?)

 

Strange as this TI-99/4A console I am using it daily/weekly, so far so good until today.

(except that it starts with a blank screen each time I turn it on, then press a key to get the titlescreen)

 

1. Today I was teaching my son to write his first TI program in TI BASIC to print his name,

but it did not work (so it was not convincing for him....):

(cut down: video attached in .zip format) and

 

 

2. Also I wanted to do a simple performance comparison test between TI and Classic99

but now my TI cannot count and print anymore?

 

 

 

 

 

PS1 - . I thought it was temporarily, after a reset it could print and count again,

 

PS2 - the issue came back unfortunately.It would be good to know the rootcause.

 

PS3 - Does someone know good Benchmark test programs for TI-99/4A

(to test bare TI-console TI Basic only, or with XB+32K, EA+32K and more hardware, etc?)

 

PS4 - that is a gaming console by Sony :-)

 

RikAndTIBUG-CannotPrintAndCount.zip