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What a mess it was back then with the RAM ICs and the corresponding boards. In a short time, 2K, 4K, 8K, 16K, 32K and 64K memory cards followed one another. And almost every generation had different RAM ICs. Accordingly, it is tedious for today's collector to buy the corresponding replacement ICs. Partly these are outrageously expensive. Well then!

ALL THE FOLLOWING INFORMATION IS PROVIDED WITHOUT WARRANTY. USE THE INFORMATION AT YOUR OWN RISK.

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1K - 1,024 x 1 bit

2 x 8 = 16 Pin

I use this RAM in my IMS 8K and IMSAI RAM 4K S-100 boards.

4K - 1,024 x 4 bit

2 x 9 = 18 Pin

I use this RAM in my DRC 16K and IMS 16K S-100 boards.

4K - 4,096 x 1 bit

2 x 8 = 16 Pin

I use this RAM in my North Star 16K S-100 boards.

2 x 9 = 18 Pin

I use this RAM in my Artec 32K and Godbout EconoRam X S-100 boards.

16K - 16,384 x 1 bit

2 x 8 = 16 Pin

I use this RAM in my 64K S-100 boards: North Star HRAM 64, DMB 6400 and North Star (32K) mod 64K. These ICs are still quite good to get on eBay today. The cost should be less than 2 EUR/piece. I have just been able to buy (Apr 2023) 2 x 9 pieces.

Here you will find all my gathered downloads for the North Star Horizon.

Here you will find all my gathered downloads for the North Star Horizon.

1. (↑) ...

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--> Go to Part 4 : PROM Modification
--> Go to Part 5 : History
--> Go to Part 6 : RAM
--> Go to Part 7 : S-100 Bus
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