Panasonic RL-H1400 Handheld Computer - Part 1
31This little machine piqued my interest as it's possible to get quite good condition examples cheaply ... as with a lot of these calculator-type handheld computers (HHC) from the early 80s they generally seem to have been used by travelling financial people.
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. These would probably need replacing.
From what I've seen, the printer attachment is a common peripheral - this is handy as it's also the cassette interface.
Other options include:
RL-P1002 colour plotter
RL-P1004A Micro printer & cassette interface
RL-P2001 TV adaptor
RL-P3001 RS-232 Serial Interface
RL-P4001 Acoustic coupler modem
RL-P6001 I/O adaptor
RL-P9001 4KByte RAM module
RL-P9002 8Kbyte RAM module
Discussion:
https://www.hpmuseum.org/forum/thread-19372.html
New capsules & RAM upgrade (Japanese):
https://jr2xzy.blogspot.com