My Tandy 1000ex boots up great, outputs perfect video and audio, reads my 5.25'' floppies, and generally seems clean upon inspection, however, there seems to be some issue with the key input.Tandy thinks a key is always pressed, regardless of the presence of the keyboard.
For example, in Boulder dash, the character is constantly moving left, and in other text fields, a constant shift leftward is present, as if the left arrow key is constantly being pressed. I disconnected the keyboard and the issue remained, meaning the
I ordered a joystick adapter hoping to play without needing to worry about the arrow keys at all, but I'm now wondering if the input of the joystick totally overrides any previously present input (would the joystick cause the Tandy to disregard theconstant left input?).
Regardless, If anyone has any information as to what problem my Tandy 1000ex is having or how to visually identify the problem on the motherboard it would be great to hear it.
So i need to dismantle the keyboard and follow the circuit from the left arrow key all the way through the ribbon cable header into the 8048 and look for a break?
So i need to dismantle the keyboard and follow the circuit from the left arrow key all the way through the ribbon cable header into the 8048 and look for a break?I don't think you'd find a break necessarily, but something that looks like it might be shorting or sticking. Perhaps something stuck under the keyboard before the mylar membrane that could be causing it to contact. I'm surprised it isn't beeping at you
Also, nothing appeared corroded on the keyboard in any way and the 8048 microcontroller looked visually fine.
Will be getting pictures soon.
So i need to dismantle the keyboard and follow the circuit from the left arrow key all the way through the ribbon cable header into the 8048 and look for a break?
Also, nothing appeared corroded on the keyboard in any way and the 8048 microcontroller looked visually fine.
Will be getting pictures soon.
How do i completely remove the motherboard? It seems attached to the metal sheet via the screws around the monitor port, and the screws look tack welded together. (on both sides of the part that says "BURNDY")You ought to be able to just unscrew the DB-9 connector retaining nuts that hold it to the metal shield, if they've got the usual hex-shape. The nuts on top of the DB-9 are to reinforce it to the motherboard. Be careful of the volume knob, it might snag.
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