The story tell about seven… pocket computers based on the Sharp PC-1500.
Yesterday i received the PTA-4000 and PTA-4000+16 with printers KA-160.
With my screwdriver i opened the PTA-4000 : PC-1500 like. Just have to check the ROM version.
And opened the PTA-4000+16 : WOW !!! Was it produced “as-is” by Sharp ? Modified by Hungarian company ?
Incredible… will write a paper about this…

Here are the seven :
PC-1500 / PC-1500A
PC-1500 japan / PC-1501
PTA-4000 / PTA-4000+16
TRS-80 PC2