Insanity 4004

Heavy Metal from the 1960s

Computeriter Emulator Software Design

Computeriter Emulator Hardware Design

Computeriter Electrical Interface

Mission: Emulate a Soroban Computeriter

What have I been up to?

Populating the ALU board

Testing the Instruction Pointer board

The most costly phrase

PCB Reflow with a Skillet: Part 1

Instruction Decoder assembly

The importance of return signal paths

ALU and ID boards sent for fabrication

How high and how fast?

Arithmetic Logic Unit board fully routed

Instruction Decoder board layout complete

JLCPCB design rules for Eagle

The Instruction Decoder PCB

Rant: Ubuntu RAID checking

Data bus charge redistribution

Internal data bus pre-charging

The Scratchpad DRAM tests found a problem!

DRAM testing methodologies

Scratchpad Register board signalling

Yet another digital clock