SC144 is dual function real time clock and I2C bus master interface card designed for the Z50Bus.

Reference	Qty	Component
PCB	1	SC144, v1.1, PCB
B1	1	CR2032 battery holder
C1 to C6	6	Capacitor, ceramic, 100 nF
C7	1	Capacitor, electrolytic 100 µF
JP1	1	Header, male, 2 x 8 pin, angled
JP2 plus JP3	1	Header, male, 1 x 4 pin, angled
Jumper shunt	10	Jumper shunt
LED1 and LED2	2	LED, blue, 3mm
P1	1	Header, male, 2 x 25 pin, angled
P2, P4, and P7	3	Header, male, 1 x 6 pin, angled
P3 and P5	2	Header, female, 1 x 6 pin, angled
P6	1	Header, male, 1 x 5 pin, angled
P8 and P9	2	Header, male, 1 x 6 pin, straight
R1 to R4	4	Resistor, 10k, 0.25W
R5 and R6	2	Resistor, 1k, 0.25W
RP1	1	Resistor pack, 8 x 10k, SIL, 9-pin
U1	1	74HCT688
U2	1	74AHCT32
U3	1	74HCT273
U4 and U5	2	74HCT125
U6	1	DS1302+
X1	1	Crystal, 32.768 kHz
IC socket 8-pin U6	1	8-pin PDIP socket
IC socket 14-pin U2, U4, and U5	3	14-pin PDIP socket
IC socket 20-pin U1 and U3	2	20-pin PDIP socket