Relay Computer

My journey in constructing an 8 bit relay computer from scratch ... made from of a ton of solder, wires, lights, relays, sweat, tears, swearing and money.

Progress Summary

This page shows the current state of construction for each unit of the computer:

  Status Design Construction
ALU Arithmetic Unit
Z. ALU:Au
Complete 
ALU Control Unit
Z. ALU:Cu
Complete  
ALU Logic Unit
Z. ALU:Lu
Complete 
Auxiliary Control Complete 
Backplane W
W.
Complete 
Backplane X
X.
Not Started 
   
Backplane Y
Y.
Not Started 
   
Backplane Z
Z.
Complete 
Clock
X. CLK
Not Started 
   
       
Controller
W. CTRL
Part-Designed  

Part-Constructed  
Decoder
W. DCDR
Part-Designed  

Part-Constructed  
Display A Part-Designed  

Part-Constructed 
Display B Part-Designed 

Part-Constructed 
Enclosure Designed 

Part-Constructed 
Incrementer
X. INC
Complete 
Memory
Y. MEM
Complete 
Register A / D
Z. REG:AD
Complete 
Register B / C
Z. REG:BC
Complete 
Register I
(Instruction Register)
X. REG:IN
Complete 
Register J
Y. REG:J
Not Started 
   
Register M
Y. REG:M
Not Started 
   
Register PC
(Program Counter)
X. REG:PC
Complete 
Register XY
Y. REG:XY
Not Started 
   
Sequencer
W. SEQ
Part-Designed  

Part-Constructed  
Test Board Complete