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