Saturday, April 18, 2020

50ck3t5 all the way...

Well the PCB is back and I have decided to socket everything so I can experiment with newer logic families and CMOS versions of the VLSI. The front panel PCB is dragging a bit...

Friday, August 23, 2019

Knobs & Panels...

Trying to maintain the original look as much as possible... Without the strange lumps of rubber...

Thursday, August 15, 2019

EPROMs

To get my Z80 board into a functioning state I need to get the code into it... One interesting thing that I had sort of forgotten in the modern world of Electrically Erasable memory is the venerable EPROM. I have memories of cycling through dozens of 2716 EPROM's to debug some Z8 assembler late into the evening for a contract I was doing... My old EPROM programmer needs an ISA bus processor and it hasn't really been used for 20+ years. Even the newer one at work, which uses a parallel port, is non starter for pretty much any hardware from the last 10 or so years. The quickest way out is this thing from e-bay, that seems to work OK... It is still cheaper that the old old EPROM programmer from 1987ish and there has been 30 years inflation since then.

Tuesday, August 13, 2019

Z80 all over again...

Back to the Z80! It's been a long time but that was the processor of the 80's...

Thursday, August 8, 2019

Making a monosynth...

Well for a laugh I am making a early 80's monosynth! This is the donor keyboard from a rather dodgy Japanese Hammond Organ -- the Piper II. The rest of the build is getting there. The Control electronics is done 100% and the front panel PCB (quite large) is at about 98% -- just need to do the filters and output stages on their own PCB.... Hopefully for completion in the very short term!

Tuesday, December 13, 2016

Minimoog drifts to top of the pile again...

After about 20+ years the Minimoog parts are at least in close proximity again...