TI99/4A Repair

The Boot Loop To Hell

SO this lovekly example of late 70s to early 80s bit of computing history eesentaly had a boot loop problem. The issue if based in the CPU boot strap circuit, at least that is what I calll it for lack of a better name. The CPU so far has tested good & swapping it out did nothing to fix the issue. So it is ether in the boot ROM or boot RAM, anoyingly the ROMs are unobtainium. This project still as not gone far as I have been unable to figure out wheere the problem is. This machine has such a strange & non standard arcitecture.