IC number:	27C128
IC function:	128 kbit (16k×8) EPROM
Related components:	64 kbit (8k×8) EPROM, 256 kbit (32k×8) EPROM, 1 Mbit (128k×8) EPROM

Component documentation

IC number	Manufacturer	Documentation
TMS27C128	Texas Instruments	Web page, Datasheet (PDF)

Component versions

IC number	Package	Access time
TMS27C128-120JL	28-pin Ceramic DIP	120 ns

Programmed components

IC number	CBM part number	CBM part description	Chip description	Checksum
TMS27C128-120JL	390337-02	EPROM1, VGA BIOS - LOW (27128-15)	PC40-III VGA BIOS V2.0 low	B065
TMS27C128-120JL	390338-02	EPROM2, VGA BIOS - HIGH (27128-15)	PC40-III VGA BIOS V2.0 high	389B
TMS27C128-120JL	390339-04		PC40-III BIOS V2.03 low	03BC
TMS27C128-120JL	390340-04		PC40-III BIOS V2.03 high	3344

Positions

Device	Positions	Package	Software
PC40-III	U1101	DIP	390339-04 (03BC)
PC40-III	U1102	DIP	390340-04 (3344)
PC40-III	U108	DIP	390337-02 (B065)
PC40-III	U109	DIP	390338-02 (389B)

Pinout

Pin	Type	Name
1	Power	VPP
2	Input	A12
3..10	Input	A7..A0
11..13	Output	DQ0..DQ2
14	Power	GND
15..19	Output	DQ3..DQ7
20	Input	E_
21	Input	A10
22	Input	G_
23	Input	A11
24..25	Input	A9..A8
26	Input	A13
27	Input	PGM_
28	Power	VCC