I recently learned that there is some kind of a new thing started up that is all about Motorola? CPU based single board computers. So I thought I’d post one that I made in uni about 28 years ago. The label on the EPROM is Assist09 so it’s possible that it would boot and allow me to upload code etc if I had a serial cable of the right kind. The board was part of an ultrasonic range finder project I made for uni. I made 3 main boards (all hand wired) along with a sonar head which had yet another board with OpAmps. There was also a power supply box, a keyboard and an LCD. – these days you could do the same thing with an Ardunino Pro Mini, an I2C display and an ebay ultrasound module. The software had a menu system I copied from Supercalc. I wrote most of the software in ‘C’, to do this I found some code to give an early version of GCC the ability to generate 6809 assembler. This ‘OS’ had only the keyboard scanning and interrupt code in assembler. I remember running pmake on the unix server at RMIT when I was compiling the compiler and almost bringing the server to its knees.
The Hitachi 6309 was an enhanced version of the Motorola 6809 Hitachi 6309, and I think I did use some of the extra instructions. I believe there was a 16 to 32 bit multiplication available which I used.
As you can see this was point to point soldered; at that time I had no practical / cost effective way of making a PCB. I am tempted now to do something with this computer, at least to see if it still works, although I have thrown my EPROM programmer and any capability to erase EPROM’s into the tip. I’m sure there are ebay cables, programmers and erasers.. Of course If I can find the actual EPROM with the sonar software, surely I haven’t thrown that away.
Perhaps this is of interest to someone.