Minimax 4-bit CPU - TD4 Architecture CPU/SBC
$158.00
Sale price
$158.00
Regular price
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Minimax 4-bit CPU - TD4 Architecture CPU/SBC
$158.00
Sale price
$158.00
Regular price
What is it?
The Minimax 4-bit CPU is an improved version of the classic TD4-CPU architecture — a Turing-complete 4-bit processor built from fewer than 20 logic gate chips. Using a 16×4 DIP switch ROM, you program it manually with no programmer required: just flip the switches and run. It’s an ideal hands-on tool for beginners learning assembly language and computer architecture from first principles.
What makes it special?
The Minimax improves on the original TD4 in several meaningful ways:
- Expanded register file — adds a 16×4-bit register file addressed by a pointer register, compared to the original TD4’s two general-purpose registers
- Variable-length instruction decoding — single-length (4-bit) instructions execute directly; double-length instructions (8-bit with immediate data) are automatically detected, buffered, and executed — achieving 100% ROM utilization under any instruction combination
- Two program status registers — CF (carry flag) and ZF (zero flag) enable conditional branching
- 4-bit input and output ports — output drives a 7-segment display showing 8421BCD code with latch
- Instruction set: NOP, ADD, SUB, CMP, IN A, OUT A, MOV A/reg, MVI A/P, JMP, JMZ, JMC, JNC
- Adjustable clock speed: 0–100 Hz — slow enough to watch each instruction execute step by step
- Single 5V power supply via Type-C connector
Options Available
- Fully Assembled — ready to program and run out of the box
- PCB Only — bare PCB for those who want to source and solder their own components