New rest-home resident: An Exidy Sorcerer

Nice. I would love an expension unit for the Sorcerer but is was hard enough to actually find the computer itself here in New Zealand. I think it will have to remain one of those wistful thoughts. I've decided to have a crack at fixing this BASIC ROM-PAC over the next few months. This is probably a good opportunity to actually LEARN about burning EPROMS and I'm sure I'm going to need to do so if I want to keep my 70's and 80's computers going for the next 20 years. It's going to be a big learning curve for me as my knowledge is still fragmented in this area. Also it's likely to be a slow project as there are lots of competing activities at the moment. However, hopefully you guys can assist if I need to ask what (to you) might seem stupid newbie-type questions. Of course I'm only ASSUMING it's the ROMS. There is not much else in the case though apart from a few caps and a logic chip or two. Is there any quick technique to determine if it IS the ROMS and if so if any particular ROM is faulty? One way that comes to mine with the Sorcerer is to somehow prevent the ROM-PAC from autostarting, then peer into the memory locations the ROM-PAC occupies (with the inbuilt monitor) to see if any of the memory seems messed up (with repeating patterns etc.). If NONE of the memory locations appear accessible this would indicate it might be something OTHER than the ROMS yes? (as it's unlikely all 4 ROMS would have developed a fault). Is this a reasonable approach to start off? I don't know if I can disable the autostart but then I haven't looked through the manual yet. Hopefully I can by holding some keys down when switching off (or something). Anyway...I'll report any progress. Terry