🇯🇵 Panasonic RL-H1400 Handheld Computer: Part 2 [TCE #0459]
16It's been a while since Part 1 in which I had *almost* finished pulling the printer apart - I finish that off in this video (thanks to a reminder from @colinebyuk).
The reason for the delay is I've been trying to get replacement NiCd batteries but keep getting sent NiMH batteries despite specifically buying NiCd batteries. *sigh*
I might have another go, and then give up ... can I convert the charging circuit in the Panasonic to support NiMH ... ?
Dunno. Further research is required. First stop, finish watching EEVblog's #35 video:
https://youtu.be/_ROhH9EkhtU
I also have a quick look at the 8Kbyte mod RL-H1800. This one again comes with insurance related ROMs.
That's all - just want to give a quick update
Summary from Part 1:
They use a full-sized, socketed Rockwell 6502 running at 1MHz and come with 2KBytes (RL-H1000), 4KBytes (RL-H1400) or 8KBytes (RL-H1800) of RAM ... the 4Kbyte model seems to be the most prevalent on ebay. The RL-H1000 can be expanded to 4Kbytes.
It has 16Kbytes of internal ROM and can take up to three 16Kbyte ROM "capsules" - these are usually 24-pin 8Kbyte Motorola 68764 EPROMs ... note that these are a bit different to 28-pin 2764 EPROMs.
It can run programs written in BASIC and SNAP, but there are also capsules with FORTH and MS-BASIC available as well.
The HHC itself has an internal 5 x 1.2V AA NiCd battery pack and the printer has a pair of 2 x 1.2V AA NiCd battery packs.