Got some 74HC151N and 10K Resistor Networks coming from Mouser in a few days and will try to use those to fix a Microbee with Basic that I have picked up as well but that had been relegated to the corner while I focused on getting the Disk Microbee refurbished! It has an even worse keyboard response with even fewer keys working than the Diak one... so if swapping those components out does the trick then I am happy!
Also I had to clean up the bottom of the case but luckily not the mainboard after the 4.5V battery memory backup that had leaked and in its place fit a battery holder for three 1.5V AA batteries instead! It now boots to the Basic screen but the keys... well they do not cooperate! I have measured the resistance levels and they seem really high compared to the Disk Microbee so I hope that replacing the new IC4 and RN1 will do the trick! If not then back to desoldering and refurbishing keys again!
Also I had to clean up the bottom of the case but luckily not the mainboard after the 4.5V battery memory backup that had leaked and in its place fit a battery holder for three 1.5V AA batteries instead! It now boots to the Basic screen but the keys... well they do not cooperate! I have measured the resistance levels and they seem really high compared to the Disk Microbee so I hope that replacing the new IC4 and RN1 will do the trick! If not then back to desoldering and refurbishing keys again!