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256k×1 DRAM used in Commodore and Amiga equipment

IC function

256 kbit (256k×1) DRAM

Related components

8 kbit (8k×1) DRAM, 16 kbit (16k×1) DRAM, 64 kbit (64k×1) DRAM, 1 Mbit (1M×1) DRAM

Component documentation

IC number	Manufacturer	Documentation
MB81256	Fujitsu	Not available
HM50256	Hitachi	Not available
MN41256	Matsushita (Panasonic)	Not available
µPD41256	NEC	Not available
MSM41256	Oki	Not available
KM41256, KM41256A	Samsung	Not available
LH21256	Sharp	Not available
TMS4256	Texas Instruments	Not available
TMM41256	Toshiba	Not available
HYB41256	Siemens	Not available
LM33256	Sanyo	Not available

Component versions

IC number	Package	Access time
MB81256-15, HM50256P-15, MN41256-15, D41256C-15, MSM41256-15, KM41256-15, KM41256AP-15, LH21256-15, TMS4256-15NL, TMM41256P-15, HYB41256-15, LM33256G-15	16-pin DIP	150 ns
HYB41256-12, LM33256G-12	16-pin DIP	120 ns

Component part numbers

CBM part number	CBM part description
380223-01	IC MEM DRAM 256KX1BIT 150ns
380223-03	256K X 1 DRAMs 120ns
380223-04	256K X 1 DRAMs 100ns
380223-05	256K X 1 DRAMs 80ns
390026-01	256K X 1 BIT DYNAMIC RAM

Positions

Device	Positions	Package	Access time
A500 Rev. 5	U16..U31	DIP	150 ns
A2000-CR Rev. 4	U501..U532	DIP	150 ns
A501 Rev. 5	U48..U63	DIP	150 ns
A2052	U15..U78	DIP	150 ns
A1060 main board	U1..U8	DIP	150 ns
A2088	U12..U27	DIP	150 ns
A2286 sandwich board	U38, U39, U44, U45	DIP	120 ns
PC-I 5MHz	U17..U32	DIP	150 ns
PC-I 10MHz	U17..U32	DIP	120 ns
PC10 combined board	U22..U30	DIP	150 ns
PC10 256k RAM expander	U1..U9	DIP	150 ns
PC10 384k RAM expander	U1..U9	DIP	150 ns
PC10-III Rev. 5	U305..U320	DIP	120 ns
PC60-III	U1, U2, U10, U11, U23, U24, U35, U36	DIP	100 ns

Pinout

Pin	Type	Name
1	Input	Address
2	Input	DIN
3	Input	_WE
4	Input	_RAS
5..7	Input	Address
8	Power	VCC
9..13	Input	Address
14	Output	DOUT
15	Input	_CAS
16	Power	GND

Copyright © 2003-2004 Ronald van Dijk - All rights reserved
Last update: 15 November 2004