The HP 1000 is a re-named HP 21MX. This E-Series is identical to the 21MX E-Series in our collection. The rename was done in 1978 when they introduced the new HP 1000 F-Series. The previous 21MX E and M-Series were renamed to 1000 E and M-Series.

Leave a Reply

Your email address will not be published. Required fields are marked *