About i²
From the beginning I knew that I would not have the luxury of lots of multiple pole relays many other people in the past have had. I could only use what I could find and after waiting for around 6 months for something to come up as a deal on ebay I was getting nowhere. Previous computers such as RC2, RC4, Zusie had all been lucky in the fact that they had either been given or found 4 pole relays at for very low prices. I cannot complain though, I was lucky too, its just my luck came in the less attractive single and double pole relays. After giving up hope in finding better relays I settled on the 300 or so PCB relays I found at school. In reality this limited me to around 450 poles (poles being a better measure of hardware being that 100 4 pole relays have 4 times the amount of connections compared to 100 single pole relays). This is a very small amount compared to HPRC or Zusie that have 1800+ poles. The archtecture of the computer is very similar to Jon Stanleys RC2 however large modifications along with my own additions needed to be made to it to use the lower amount of poles available.
i² Feature List :
i² Feature List :
- 8-bit data bus and 8-bit address bus
- 3x 8-bit working registers (A, B and C)
- ALU with add, inc, dec, and, not, or, xor and shift left
- 2k non-volatile static RAM for memory with last 3 bits of address controled by switches
- 2x 3 digit + 1 symbol Nixie tube display for results output
More to come..