Browse Items (8424 total)
Sort by:
PDP-9 Core Memory Module (?)
A photo of what is possibly a PDP-9 4K magnetic core memory module / backplane assembly using coincident-current magnetic core memory (see COINC DUAL label)
The top panel shows: DATA ADDRESS Indicators labeled 2048 and 4096
A/B memory sections. …
The top panel shows: DATA ADDRESS Indicators labeled 2048 and 4096
A/B memory sections. …
PDP-4 Computer
The PDP-4 was 18-bit machine intended to be a slower, cheaper alternative to the PDP-1; it was not considered commercially successful. All later 18-bit PDP machines (7, 9 and 15) were based on a similar, but enlarged instruction set, more powerful,…
Payroll Ledger - 1910
American Woolen Company
This many paged ledger has but one page of entries, shown. Its not clear what group of employees earnings are recorded. Note on bottom right the page was audited by Geo. R. Lawton.