Table of Content

Here you will find datasheets for some of the components used in the Atari computer.
The datasheets are organized in the following categories:

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Atari Chips

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Complex Components

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Simple Components

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Memories General Information

Most SIMMs and DRAM chips are specified using a "depth x width" notation. There are DRAM chips of various sizes available on the market, which have different depths and widths as well, and a SIMM can be made up (in general) of any combination of DRAM chips that adds up to the proper depth and width. For example, a 1x9 30-pin 1 MB parity SIMM is typically made up of either 9 * 1Mx1 DRAMs, or 2 * 1Mx4 DRAMs plus 1 * 1Mx1. In both cases, the total memory is the same: 1Mx9. Some of the information presented here comes from here


The following table shows common DRAM manufacturers


Code on First-Quality Chips


MB plus stylized "F"


Hitachi HM plus Hitachi logo
Hyundai HY
Micron MT
Mitsubishi M5M plus Mitsubishi logo
Motorola MCM plus Motorola logo
Oki Oki M5
Samsung KM or SEC
Texas Instruments TI or TMS
Toshiba TC or TOSHIBA


The following table shows the different sizes of DRAM chips commonly used in memory modules, and the different bit widths that each size is typically available in. For each one, the configuration of the chip is shown (depth x width) and then in parentheses, the most commonly found last four digits of the part number found on the chip:

DRAM Size in MB

1 Bit Width

4 Bit Width

8 Bit Width

16 Bit Width

0.25 Mbits (256 Kbits)

256Kx1 (256 or 1256)




1 Mbits

1Mx1 (1000 or 1024

256Kx4 (4256)



4 Mbits

4Mx1 (4000 or 4100)

1Mx4 (4400 or 4001)

512Kx8 (4800 or 8512)

256Kx16 (4260)

16 Mbits

16Mx1 (6100 or 7100)

4Mx4 (6400 or 7400)

2Mx8 (7800 or 2100)

1Mx16 (6160, 7160 or 8160)

64 Mbits


16Mx4 (!?)

8Mx8 (4800 or 6000)

4Mx16 (!?)

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