This is a von Neumann 8-bit breadboard computer with:
- 16-bytes of RAM
- 1 memory address register
- 1 instruction register
- 1 program counter
- 2 general-purpose registers
- 1 arithmetic logic unit
- 1 flags register with 2 flags (carry and zero)
- 1 output register with 7-segment displays
- 16 microinstructions and 11 instructions (including conditional and unconditional jumps) managed by 2 EEPROMs
| Control Pin |
Function |
| HLT |
Halt Clock |
| MI |
Memory Address Register (IN) |
| RI |
RAM (IN) |
| RO |
RAM (OUT) |
| IO |
Instruction Register (OUT) |
| II |
Instruction Register (IN) |
| AI |
Register A (IN) |
| AO |
Register A (OUT) |
| SU |
Subtract |
| EO |
Arithmetic Logic Unit (OUT) |
| BI |
Register B (IN) |
| OUT |
Output Register (IN) |
| CE |
Program Counter (ENABLE) |
| CJ |
Program Counter (JUMP) |
| CO |
Progarm Counter (Out) |
| FI |
Flags Register (IN) |
| Instruction |
Function |
Control Sequence |
| NOP |
No operation |
(CO MI) (RO II CE) |
| LDA |
Load register A with contents in xxxx |
(CO MI) (RO II CE) (IO MI) (RO AI) |
| ADD |
Add contents in register A and xxxx |
(CO MI) (RO II CE) (IO MI) (RO BI) (EO AI FI) |
| SUB |
Subtract contents in register A and xxxx |
(CO MI) (RO II CE) (IO MI) (RO BI) (EO AI SU FI) |
| STA |
Store contents in register A at xxxx |
(CO MI) (RO II CE) (IO MI) (AO RI) |
| LDI |
Immediately load xxxx to register A |
(CO MI) (RO II CE) (IO MI) (IO AI) |
| JMP |
Jump to program stored in xxxx |
(CO MI) (RO II CE) (IO MI) (IO CJ) |
| JC |
Jump to program stored in xxxx if carry flag is set |
(CO MI) (RO II CE) (IO MI) (IO CJ)* |
| JZ |
Jump to program stored in xxxx if zero flag is set |
(CO MI) (RO II CE) (IO MI) (IO CJ)* |
| OUT |
Dump register A contents to output register |
(CO MI) (RO II CE) (IO MI) (AO OUT) |
| HLT |
Halt clock signal |
(CO MI) (RO II CE) (IO MI) (HLT) |
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