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RAM Page

How to read the "Product Name" for RAM modules:
Part #10100, 1 x 36-60 (12),(read as: "one by thirty-six, sixty"), this module is one megabit (1), by (x), thirty-six bits (36), seventy two pin, parity SIMM with an access time of sixty nanoseconds (-60), and twelve chips on the circuit board (12)*. This is a standard four megabyte, Mb, (RAM qty column), parity SIMM.

Parity SIMMs have either 9 or 36 bits, ( x9 or x36). Non-parity SIMMs have 8 or 32 bits, (x8 or x32). Eight and nine bit SIMMs, (x8, x9), have 30 pins. Thirty-two and thirty-six bit SIMMs, (x32, x36), have 72 pins. Sixty-four bit DIMMs, (x64), have 168 pins.

* Note: If the number in parenthesis is accompanied by the "Mb" symbol, the number will be representing the capacity of the module.
Example: Part #15410 DIMM 8x64-60 (64Mb) is a sixty-four megabyte (64Mb) module.

Now, if you know what "type" you require, what part do you need?
Here's how: Find the point on the table where the "type", (x8,x9,x32,x36,x64), intersects with the "size" ,(1Mb,2Mb,etc.), to get the description of the part you need. EDO SIMMs are usually x32.

            Part Descriptions
Sizes Styles
Non-parity Parity
x8, 30 pin x32, 72 pin x64, 168 pin x9, 30 pin x36, 72 pin x72, 168 pin
1MB 1x8 256x32 - 1x9 256x36 -
2MB 2x8 512x32 - - 512x36 -
4MB 4x8 1x32 - 4x9 1x36 -
8MB 8x8 2x32 1x64 - 2x36 -
16MB 16x8 4x32 2x64 16x9 4x36 2x72
32MB - 8x32 4x64 - 8x36 4x72
64MB - 16x32 8x64 - 16x36 8x72
128MB - - 16x64 - - 16x72
Types
30 pin 72 pin 168 pin
 • FPM x8 or x9









 • 5.0 V
 • 50 - 150 ns 		 • FPM x32 or x36
 • EDO x32
 • EDO ECC x36
 • Parity w/EDO x36
 • Parity w/ECC x36





 • 3.3 or 5.0 V
 • 45 - 100 ns 		 • FPM x64 or x72
 • EDO x64
 • EDO ECC buffered x72
 • EDO ECC unbuffered x72
 • ECC PC SDram x72
 • SDram 2 clock x64
 • SDram 4 clock x64
 • G3 SDram x64
 • PC SDram x64

 • 3.3 or 5.0 V
 • 8.5 - 100 ns

 

What do the little numbers on the black chip mean?
The numbers identify the type and size of that particular chip. The following is a list of part numbers used by various manufacturers.

DRAM Table (1 of 2)

Organization/
Density 		Fujitsu
MB 		Goldstar
GM 		Hitachi
HM 		Hyundai
HY 		Micron
MT 		Mitsubishi
M5M
256kx1 (256k) 81256 71C256 51256 53C256 1256 4256
1Mx1 (1M) 81C1000 71C1000 511000 531000 4C1024 41000
256kx4 (1M) 81C4256 71C4256 514256 534256 4C4256 44256
1Mx4 (4M) 814400 71C4400 514400 514400 4C4001 44400
4Mx1 (4M) 814100 71C4100 514100 514100 4C1004 44100
256kx16 (4M) 814260 71C4260 514260 514260 4C16257 44260
512kx8 (4M) 814800 71C4800 514800 514800 4C8512 44800
16Mx1 (16M) 8116100 71C16100
71C17100 		5116100 5116100 4C16M1 416100
4Mx4 (16M) 8116400 71C16401
71C17401 		5116400 5116400 4C4M4 416400
1Mx16 (16M) 8116160 N/A 5116160
5118160 		5116160
5118160 		4LC1M16C3 416160
418160


DRAM Table (2 of 2)

Organization/
Density 		Motorola
MCM 		NEC
UPD 		Oki
MSM 		Samsung
KM 		Texas Inst.
TI 		Toshiba
TC
256kx1 (256k) 6256 41256 41256 41256 4256 41256
1Mx1 (1M) 511000 421000 511000 41C1000 4C1024 511000
256kx4 (1M) 514256 424256 514256 44C256 44C256 514256
1Mx4 (4M) 514400 424400 514400 44C1000 44400 514400
4Mx1 (4M) 514100 424100 514100 41C4000 44100 514100
256kx16 (4M) 54260 424260 514260 416C256 45160 514260
512kx8 (4M) 54800 424800 514800 48C512 N/A 514800
16Mx1 (16M) 516100 4216100
4217100 		5116100
5117100 		41C16000
41C16100 		416100 5116100
4Mx4 (16M) 516400
517400 		4216400
4217400 		5116400
5117400 		44C4000
44C4100 		416400 5116400
5117400
1Mx16 (16M) 516160
518160 		4216160
4217160
4218160 		5116160
5118160 		416C1000 416160 5116160
5118160


SRAM Table (1 of 2)

Organization/
Density 		Fujitsu
MB 		Goldstar
GM 		Hitachi
HM 		Hyundai
HY 		Mitsubishi
M5M 		Mosel/Vitelic
MS
2k x 8 (16k) 8416 76C28 6116 6116 5117 6516
8k x 8 (64k) 8464 76C88 6264 6264 5165 6264/6265
32k x 8 (256k) 84256 76C256 62256 62256 5255 / 5256 62256
128k x 8 (1M) 841000 76C8128 628128 628100 51008 / 51108 628128
512k x 8 (4M) N/A N/A 628512 628400 5408 N/A


SRAM Table (2 of 2)

Organization/
Density 		NEC
UPD 		OKI
MSM 		Samsung
KM 		Sony
CXK 		Toshiba
TC
2k x 8 (16k) 4416 N/A N/A 5816 TMM2016
5516 / 5517
8k x 8 (64k) 4464 5165 6264 5864B 5564 / 5565
32k x 8 (256k) 43256 51256 / 51257 62256 58257 / 58267 55257
128k x 8 (1M) 431000 521001 681000 581000 / 581001 551001
512k x 8 (4M) 434000 N/A 684000 584000 / 584001 554002


Cache SRAM Table(1 of 1)

Organization/
Density 		Alliance
AS 		Cypress
CY 		IDT
IDT 		ISSI
IS 		Micron
MT 		Motorola
MOT 		Paradigm
PDM 		Samsung
KM
8k x 8 (64k) 7C164 7C185 7164 61C64 5C6408 6264 N/A 6865
32k x 8 (256k) 7C256 7C199 71256 61C256 5C2568 6206 41256 68257
128k x 8 (1M) 7C1024 7C109 71024 61C1024 5C1008 6226 41024 681001
256k x 4 (1M) 7C1028 7C106 71028 N/A 5C1005 6229 41028 641001

MAC VRAM*

Display Size VRAM Installed
512k 1Mb 2Mb 4Mb
14 inch displays 256 colors 32,768 colors 16.7 million colors 16.7 million colors
15 inch displays 256 colors 32,768 colors 16.7 million colors 16.7 million colors
17 inch displays 256 colors 32,768 colors 16.7 million colors 16.7 million colors
20 inch displays 16 colors 256 colors 32,768 colors 16.7 million colors

*This table is to be used as a general guideline. Increasing resolution beyond 640 x 480 could require more VRAM than listed here.

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