House cleaning!

A couple of repair-related comments for the lucky person who gets these... This is also known as a 9836. If it's the (common) monochrome version, it's a 9836A . The colour model is a 9836C. If reseeating the floppy controller board inside the machine (the board immediately behind the drives), then one common fault is the buffer RAM on the floppy cotnroller PCB,. There's a 256 byte RAM buffer there, either made fro ma pair of 2112s or 2114s (in the latter case the extra 2 address lines are grounds). If the latter, then, well, you know the reliability fo 2114s :-) Hmmm... Doies it do anything at power-up? On this machine, unlike the 9836, the coolung fan runs from the primary side of the mains transformer (on the 9836, it runs from the -12V output of the PSU, so if the fan runs on that mahcine, the PSU is doing _something_). So if the machine seems totally dead, it might be a PSU prolem. And of course forvideo to appear on the monitor, the CPU board has to be basically working, along with the rext video board. And the monitor PCB itself. This machine is somewhat strange in that the monitor PCB contains the horizontal deflection and video circuits only. The vertical deflection circuit is on the text video board. Also be warned when working on one of these that the CRT has no tension band or other implosion protection. The user is protected by the plastic anti-glare filter, but be careful when working inside the machine, especially if you have the monitor cover off. FWIW, I've worked on all 3 models (9826, 9836A, 9836C) and can probably help the new owner get them going again. -tony