MKHBC-8-R1 - CPU bus completed.
After a long break (as usual), I did some work on MKHBC-8-R1 again. The progress is slow, project definitely lost a lot of momentum, but don't worry I did not abandon it. In fact, I am about to give it some more time in hope to have some working parts before the end of year.
Today I sort of finished soldering the CPU bus by wiring the remaining +12V line and 8 I/O lines from I/O decoder. About 25% of the back plane or mother board is finished. Remaining (To Do) mother board sections are: I/O Expansion Bus, Prioritized IRQ Controller, Power Supply and Front/Control Panel. And of course the cards that will go into CPU bus and I/O bus sockets. I will start with CPU, RAM and RS-232 cards.
Here is how the mother board looks like now:
|The section I soldered today (lower right corner, blue wire).|
|Quality of connections needs some improvement. My age, crappy soldering iron and lack of soldering rosin (rock) do not help.|
|View on the entire CPU bus section (down side of the board).|
|Top of the board (currently still almost empty).|
|Just another view of the down side of the board.|
That's it for today. Thanks for reading.