Quantity   Component name
1 × R6507 CPU 28-pin member of the original 6502 family
1 × HM62256 SRAM 32 KB static RAM
1 × 74LS573 octal latch Holds address bits A8-A15
2 × 74HC245 bus transceiver Address bus buffers
2 × 74HC132 quad Schmitt NAND Glue logic
1 × 74HC74 dual D flip-flop Single-step circuit on the front panel PCB
1 × NE555 timer Variable clock, tens of kHz to ~800 kHz
1 × 100 kOhm potentiometer Clock speed knob
24 × Red LEDs Address and data bus indicators
16 × Three-position toggle switches Address/data: pull-up, pull-down or float
3 × (ON)-OFF-(ON) momentary toggle switches Reset, read/write and load
1 × ON-(ON) momentary toggle switch Step
5 × Two-position toggle switches Mode switches (Instr/Cycle etc.)
62 × 4.7 kOhm resistors Switch pull-ups/pull-downs and LEDs
3 × 1N5819 Schottky diodes Power input diodes
1 × USB-C receptacle Power only
2 × 5.1 kOhm resistors USB-C CC pull-downs
12 × Capacitors 9x 100 nF decoupling, 100 uF, 1 uF, 1 nF
2 × 1x20 female/stacking pin headers Board-to-board connection
2 × 2xAA battery holders
4 × NiMH AA cells Under 5.5 V after the diode drop
2 × Single-sided FR4 copper clad, 10 x 15 cm Isolation-routed motherboard and front panel PCB
1 × 3 mm aluminium sheet Engraved and chamfered front panel
1 × Hardwood block Milled case, finished with oil