Answer by dirkt for How did DRAM refresh work on the Altair 4K dynamic memory...
Your link gives "MITS - 88-S4K" as name of this particular DRAM board. Googling finds documentation for this board here, and on page 2-5 under "Refresh Ciruits" it statesThe 12-stage counter provides...
View ArticleHow did DRAM refresh work on the Altair 4K dynamic memory boards?
The initial memory board shipped with the Altair 8800 was a 1K board using one to four pairs of Intel 8101 1024 bit (256 × 4) static RAM. Altair then started working on a 4K dynamic memory board. The...
View ArticleAnswer by cjs for How did DRAM refresh work on the Altair 4K dynamic memory...
(Note: this answer is based on information from dirkt'sanswer, and especially the excellent documentation he dugup.)I don't have information about the earlier (unreliable) board, the 88-4KD.However, I...
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