Revision A of the TOY battery board did not have a cutoff circuit, to stop the Lithium battery discharging beyond its allowed level if the MicroVAX was left unpowered for too long.
So, a new board was designed and built, that uses a AP9101CK6-ANTRG1 battery protection IC.
Continue reading “TOY Battery Board – Rev B”
For years I wanted to have a MicroVAX II that would be livingroom-friendly, i.e. quiet and nice to look at.
Continue reading “TARZAN- a Homebrew MicroVAX II”
After about a month of construction, two power supplies, three custom PCBs and six quiet fans, the homebrew MicroVAX II is ready.
For my “Hombrew MicroVAX II” project, I have designed and built a custom side panel board, which includes
Continue reading “A Custom Combo MicroVAX II Panel Project”
* A Direct replacement for the DELQA cab kit (70-22786-01) (dual – can connect to two DELQAs)
* Two DHV11 cab kits (similar to H3173-A, CK-DHV11-XX)
* Space for a FUNCT/SEL SLU Module
* Drivers for front panel external LEDs and switches
I have designed and built a replacement for the original MicroVAX II (KA630) CPU patch panel, also known as the “FUNCT SEL/SLU MODULE”.
The original DEC part numbers are 5416744-0-1, 5016743-01-01, and it can also replace 5417016-0-0 (KA650/KA655 SLU) and perhaps others as well.
I have decided to do this project as I have seen more than one original patch panel board corroded beyond repair.
Continue reading “FUNCT SEL/SLU Module Replacement Project”
This 100% new power supply, fondly named H7864-C, is a 1:1 replacement for the Astec AA12131 (DEC p/n H7864-A, H7864-B) power supplies.
It is physically compatible and will fit in any BA23 housing, and will work with any PDP11, MicroVAX (KA630/650/655) or RTVax.
Electrically it meets or surpasses all of the original power supply requirements. Continue reading “BA23 Power Supply (H7684-A / H7864-B) Replacement”