These small pocket computers were derived from the PC-1251. They
had same keyboard and size. The main difference was the larger display, which
now provided two lines with 24 characters, which was a great advantage,
especially for BASIC programming. The built-in BASIC interpreter was also close
to the PC-1251 interpreter.
In 1984, the PC-1260 and PC-1261 were released. The only difference between
these two was that the former had 4 KB RAM and the latter 10 KB. Internally,
they were operated by the SC61860 CPU (8 bits), which was clocked 33% faster
than in the PC-1251.
The CPU was mounted on the main PCB, together with the two display driver chips SC43536. Memory was incorporated on a second small PCB. The PC-1260 had the SC613256 ROM plus two HM6116 8K x 8 RAM ICs. The PC-1261 had the
same ROM, but five "naked" RAM chips, i.e. chips without DIL case, mounted
directly onto the PCB.
Two years later, the PC-1261 was re-released as the PC-1262. It was identical in functional terms, but had a different case color scheme. Internally, it was
based on the same main PCB, but the memory PCB was now equipped with a SC623257 ROM, a HM6264 8K x 8 RAM, and a LH5116 2K x 8 RAM.
The picture represents a PC-1261 mounted on a CE-125 micro cassette recorder and thermal printer unit.
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I had the same problem on a Sharp PC-1262.
This one was laying around without batteries for several years and with new batteries it went straight to Japanese Modus.
Removing the batteries and installing them while holding down the rest button reset the calculator to normal modus.
Sunday 1st May 2022
Hi, pro is correct.
I do it
Sunday 29th August 2021
I just fired up a PC-1260 and got the Japanese characters. However for me a few attempts at resetting with/without holding down a key brought up the European/USA mode. Can''t seem to find a manual in English but I have a 1251 manual so was able to figure out the RSV mode for example.
Wednesday 2nd December 2020
PC-1260 PC-1261 PC-1262
BUILT IN LANGUAGE
Sharp Basic interpreter
52 keys, QWERTY caculator type with numeric key-pad