Many Australians growing up in the 1970’s and early 80’s had their first exposure to hobbyist computers through projects published in Electronics Australia and Electronics Today International magazines . My first computer was the 2650 minicomputer published in May 1978 which was designated the 78up5.
The 18up5 has the same layout as the original, and adds the option for a 2716 EPROM instead of the now difficult to obtain PIPBUG mask ROM. It also includes the option for a crystal oscillator instead of the monostable oscillator.
PIPBUG is running at 300 baud on the new board and I’m working on 4800 baud. The power-on reset is not working either but the manual reset works fine.
I’ll publish all of the circuits and schematics once it is fully operative.