A. Component List
Semiconductors
IC1,2 74LS245 STEbus address and data buffers
IC3 74LS14 STEbus buffer
IC4 74LS688 STEbus address decoder
IC5 PAL J105 U5
IC6 74LS164 shift register
IC7 74LS393
IC8 PPM101C Stepper motor controller
IC9 74S04 Inverter
IC10 L298 High-current buffer
IC11 74LS367 Input buffer for limit switches
IC12 74LS245 Input buffer
IC13 74LS374 Output latch
TR1 2N2369A Fast NPN
D1-8 Schottky diode, 2 amps.
Resistors
R1,2,3 1k pull-up
R4,5 330R oscillator circuit
R6 2k2 base load for TR1
RP1 4k7 × 8 SIL
Capacitors
C1,2,11 22µ 16V tantalum
C3-10,12-13 100n
Miscellaneous
XL1 12 MHz crystal