HP 65 & 67 Clear Cased Prototypes
A Hewlett Packard 65 alongside two HP-67 clear cased prototypes. The middle 67 has a serial number 9999A00196 indicating that it's a prototype made in the USA, the right clear 67 has no serial number, so it is more likely a demonstrator model.
Note the different internals of the two clear cases.
The HP 65 was the world's first hand held programmable calculator, introduced in 1974. The HP-67 was released in 1976, which was more powerful and had more memory. This photo symbolises part of that journey.
HP 65 & 67 Clear Cased Prototypes
A Hewlett Packard 65 alongside two HP-67 clear cased prototypes. The middle 67 has a serial number 9999A00196 indicating that it's a prototype made in the USA, the right clear 67 has no serial number, so it is more likely a demonstrator model.
Note the different internals of the two clear cases.
The HP 65 was the world's first hand held programmable calculator, introduced in 1974. The HP-67 was released in 1976, which was more powerful and had more memory. This photo symbolises part of that journey.