Memory capacity (words) (Memory) over time
Capacity of a word-addressed machine. Converting to bytes needs the declared word width and is published as a derived claim.
- Device scope
- memory
- Method
- Design capacity
- Plotted in
- machine word
Chart
4 figures from 3 machines, spanning 1965 to 1966. The lowest memory capacity (words) here is 2048 words (Apollo Guidance Computer (Block II), 1966) and the highest is 36 864 words (Apollo Guidance Computer (Block II), 1966). That is a range of about 18× within one comparability group; the figures are plotted in words. Points use the release date of the machine the figure belongs to. The table below lists absent figures with their recorded reasons.
Data
| Machine | Released | Figure | Confidence | Sources |
|---|---|---|---|---|
| DEC PDP-8 DEC PDP-8 standard core memory | 1965 | 4096 words Standard fitted core with its native word width. | Vendor-rated | |
| Apollo Guidance Computer (Block II) Apollo Guidance Computer core rope memory | 1966 | 36 864 words Six rope modules; total fixed read-only capacity of the Block II computer. | Vendor-rated | |
| Apollo Guidance Computer (Block II) Apollo Guidance Computer erasable core memory | 1966 | 2048 words Coincident-current ferrite core array wired in 32 by 64 planes. | Vendor-rated | |
| Saturn Launch Vehicle Digital Computer Saturn LVDC toroidal core memory module | 1966 | 4096 words One basic module: fourteen 128 by 64 core planes, 4096 non-redundant 28 bit words. | Vendor-rated |
Why this chart holds one group only
Every point on a chart is implicitly compared with every other point on it. This chart uses one comparability group: one metric, one device scope, one method . There is no chart of all clock frequencies over time because they are not one quantity.
Points use the release date of the machine a figure belongs to, including figures recorded against a part. A release date applies only to a machine that shipped. What this metric measures.