HP2648A tape drive capstans

Christian Corti cc at corti-net.de
Thu Feb 16 03:31:30 CST 2006

On Wed, 15 Feb 2006, Richard wrote:
> Based on posts here and information at hpmuseum.net, it seems that the
> 2647A and 2649A had a programmable aspect to the equipment, while the
> other 264x terminals did not.

Each 264x terminal is programmable. You can write your own machine code 
and load it either from remote or from the tape drive into memory and 
execute it. There are several games for these terminals that run on the 
builtin processor, for both the i8008 (e.g. HP2644) and the i8080 (e.g. 
The system calls are well documented in the technical manuals, as well as 
all ROM entry points, variables etc. I have about four or five *thick* 
binders for the HP2648 with detailed technical descriptions, microcode 
listings and schematics for all options that were available.


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