cj7hawk
Veteran Member
Oh, I don't know. I've had plenty of times in my life when I've been frustrated enough during a debugging session, that, had the idea just popped into my head, I definitely would have gone in and started stabbing the traitorous DRAM chips.
Oh, this is brilliant! Please start a thread with some pics of your JR-100U, and post a ROM dump! (Oops, should have looked. I've found the existing thread; I'll comment more there.) I have never seen one, though I have seen pics of the foreign JR-200. Which BIOS, too, come to think of it, I do not have a copy of. (Though perhaps it was unchanged?) I have only the Japanese JR-200 (two versions) and JR-100.
I have dumps of the both JP BIOSes and the BASIC, along with partially disassembled versions of them, and lots of other docs in my retroabandon/panasonic-jr repo. That machine is also one of the reasons why I wrote my 6800 simulator. I'd love to get back to doing more work on it, if you're interested.
I don't know what happened to the photo I posted; it looked ok when I originally posted it. But here's another try:
View attachment 1272049
Oh, that is a nice word processor. Small, neat and a wide screen CRT. Stuff like this was cutting edge before LCDs came out cheaply enough.
OK, I'll pull out the JR-100 and dump the ROMs but it's a Japanese model. The only difference between Japanese models and non-Japanese models is the power supply. Everything else was the same.
My father nearly got me the JR-200 but it was a lot more expensive than the 100 and he felt that the only difference was color and the space bar... He had no idea how much more powerful the JR-200 basic is over the JR-100 and it has real world interfacing capabilities. If I had the JR-200 I might not have gotten a Spectrum and would have followed a different path, but the Integer maths pushed me to upgrade sooner.