IC number:	8242, 8742
IC function:	8-bit slave microcontroller, UPI (Universal Peripheral Interface)

Component documentation

IC number	Manufacturer	Documentation
8242	Intel	Not available
8742	Intel	Datasheet (PDF)

Device versions

IC number	Package	ROM type
P8242	40-pin Plastic DIP	Pre-programmed
D8742	40-pin Ceramic DIP	OTP
P8742	40-pin Plastic DIP	OTP

Programmed components

IC number	CBM part number	CBM part description	Checksum
	380680-01		1F4B
8742	390341-01	IC, 8742, Microcntrl EPROM
8242	390341-01	8242 Keybrd control
8242	390580-01	P8242 Intel Microcontroller
8742	391171-01		37BB

Positions

Device	Position	Component	Package
A2286 sandwich board	U72	380680-01 (1F4B)	DIP
A2386	U601	391171-01 (37BB)	DIP
PC30-III board rev. 1	U203	390580-01 / 390341-01	DIP
PC30-III board rev. 8	U203	390580-01 / 390341-01	DIP
PC40-III	U203	390341-01	DIP
PC60-III	U77	390580-01	DIP
T486	U156	390580-01	DIP

Pinout

Pin	Type	Name	Signal name
			A2286 sandwich board	PC30-III, PC40-III	PC60-III
1	Input	TEST0	KBCLK	connected to pin 3 of CN201 indirectly	KBDCLK
2	Input	XTAL1	PCLK	GND	8042CLK
3	Input	XTAL2	PCLK	7.159M	8042CLK*
4	Input	RESET_	RESET_	NRESET'	RESET4*
5	Input	SS_	+5V	VCC
6	Input	CS_	GND		8042CS*
7	Input	EA	GND
8	Input	RD_	8042RD_	N8042RD'	XIOR*
9	Input	A0	SYSA(2)	BADDR(2)	XA(2)
10	Input	WR_	8042WR_	N8042WR'	XIOW*
11	Output	SYNC	unused
12..19	I/O	D0..D7	EDATA(0)..EDATA(7)		XD(0)..XD(7)
20	Power	VSS	GND
21	I/O	P20	SETSD_	NSETSD'	RESET2*
22	I/O	P21	A20GT		GATEA20
23	I/O	P22	unused
24	I/O	P23	unused
25	I/O	PROG	+5V	VCC
26	Power	VDD	+5V	VCC
27	I/O	P10	+5V via RN10	unused	SW3
28	I/O	P11	+5V via RN10	unused	SW4
29	I/O	P12	+5V via RN10	unused	SW5
30	I/O	P13	GND	SW0
31	I/O	P14	unused		SW6
32	I/O	P15	+5V via RN10	SW1
33	I/O	P16	connected to J14	SW2
34	I/O	P17	+5V via RN10	connected to CN202 via FB207	KBDINH
35	I/O	P24/OBF	KBDINT		IRQ(1)
36	I/O	P25/IBF_	unused
37	I/O	P26/DRQ	P26	connected to pin 3 of CN201 indirectly	KBCLK*
38	I/O	P27/DACK_	P27	connected to pin 2 of CN201 indirectly	KBDATA
39	Input	TEST1	KBDATA	connected to pin 2 of CN201 indirectly	KBDDATA
40	Power	VCC	+5V	VCC