SC505 is dual function real-time clock and I2C bus master interface card designed for Z50Bus.

Reference	Qty	Component
PCB	1	SC505, v1.0, 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, green, 3mm, angled
P1	1	Box header, 2 x 25 pin, angled, or Header, male, 2 x 25 pin, angled
P2, P4, P8, P9	4	Header, male, 1 x 6 pin, angled
P3, P5, and P7	3	Header, female, 1 x 6 pin, angled
P6	1	Header, male, 1 x 5 pin, angled
R1 to R4	4	Resistor, 10k, 0.25W
R5 and R6	2	Resistor, 1k, 0.25W
RN1	1	Resistor network, 8 x 100k, SIL, 9-pin
U1	1	74HCT688
U2	1	74HCT32
U3	1	74HCT273
U4 and U5	2	74HCT125
U6	1	DS1302+
X1	1	Crystal, 32.768 kHz
U1 and U3 socket IC socket 20-pin	2	20-pin PDIP socket
U2, U4, U5 socket IC socket 14-pin	3	14-pin PDIP socket
U6 socket IC socket 8-pin	1	8-pin PDIP socket
Spacer	1	Spacer, 10mm, M3, nylon
Screw (for spacer)	1	Machine screw, 6mm, M3