IC number:	6550
IC function:	4 kbit (1k×4) SRAM with four chip selects
Related components:	4 kbit (1k×4) SRAM

Component documentation

IC number	Manufacturer	Documentation
6550	MOS Technology	Not available

Component versions

IC number	Package	CBM part number	CBM part description
6550	22-pin DIP	901438-01	6550 RAM

Positions

Device	Positions	Positions (not installed)
4k PET board assy 320008, 320081	UJ5, UJ6, UJ7, UJ8, UI5, UI6, UI7, UI8, UC3, UC4	UJ1, UJ2, UJ3, UJ4, UI1, UI2, UI3, UI4
8k PET board assy 320008, 320081	UJ1, UJ2, UJ3, UJ4, UJ5, UJ6, UJ7, UJ8, UI1, UI2, UI3, UI4, UI5, UI6, UI7, UI8, UC3, UC4

Pinout

Pin	Type	Name
1..6	Input	A0..A5
7	Input	phi2
8..11	Input	A6..A9
12	Input	R/_W
13..16	I/O	D0..D3
17	Power	VDD
18..19	Input	_CS4.._CS3
20..21	Input	CS2..CS1
22	Power	VSS