SAP-1
- LDA - 0 - Load RAM data into accumulator
- ADD - 1 - Add RAM data to accumulator
- SUB - 2 - Subtract RAM data from accumulator
- OUT - e - Load accumulator data into output register
- HLT - f - Stop processing
Working CPU with eight 8-bit registers and eleven commands. Instructions in the project, command list below.
Commands:
LDA r - loads value from register r into accumulator
STA r - stores accumulator value in register r
CLR r - clears register r
INC r - increments the value of register r and replaces into r
DEC r - decrements the value of register r and replaces into r
COM r - stores the complement of the value in register r in the accumulator
ADD r - adds value in register r to the accumulator
SUB r - subtracts accumulator value from value in register r, replaces into accumulator
AND r - stores value of (accumulator AND r) in accumulator
IOR r - stores value of (accumulator OR r) in accumulator [inclusive or]
XOR r - stores value of (accumulator XOR r) in accumulator [exclusive or]
*Eight 8-bit registers: r must be a value between 0 and 7 and refers to the address of the register, not its contents*
Microprocessore a 4 bit
Microprocessore a 4 bit v2
BYTER: Nonexistent ISA following chip
I decided to do this separately from the other one because it works nicely. Also it follows a set philosophy instead of "eh, I'll figure it out". This is NOT meant to be good, it's meant to work.
ModuSt Chip
Another nonexistent ISA based chip, but this time I have a bit of experience with it. I'm also doing things a little bit differently this time around, too.
The name itself means Modular Stack, because that's its two big concepts. First is that it's all focused on working with a stack, and second is that it's very modular.
