HP Calculator Heritage HP 25 - 1975 The HP 25 Programmable Scientific Calculator was released in 1975 and followed a year leter the HP 25C Programmable Scientific Calculator. This advertisement appeared in a Technical Journal in late 1976. Caption: Introducing the first pocket programmable that remembers your programs and data even when it’s turned off. It’s called the HP-25C and incidentally, the ‘C’ stands for ‘Continuous Memory C-MOS’ technology. Hewlett-Packard Company - Corvallis Division

Hewlett-Packard introduces a smaller scientific programmable: the uncompromising HP-25 Published: The Straits Times, 23 September 1975, Page 23

HP Calculator Heritage - The HP Way Customer value, the Seventies’ HP Way with products designed for your maximum customer value obtained through HP’s product research, innovation, experience, support, human engineering and quality control. Hewlett-Packard, a world-wide leader in the minicomputer field, produces computers, small and medium scale systems and a host of add-ons. This equipment is finding increasing use in companies of all sizes for data management, information retrieval and for automating measurement.

New from Hewlett-Packard… HP-27 & HP-91 Published: The Straits Times, 5 May 1976, Page 2

Hewlett-Packard introduces a smaller uncompromising calculator: the HP-21 Scientific. Published: The Straits Times, 3 May 1975, Page 7 The Straits Times, 26 June 1975, Page 6

The HP-65 was the first programmable handheld calculator in the world. Introduced by Hewlett-Packard in 1974, it was considered an electronic marvel. The HP-65 was tried on backup computations for docking maneuvers on board the NASA Apollo Space Command / Service Module in the Apollo-Soyuz missions in 1975. Caption: HP-65 It’s programmable! Now comes the world’s first fully programmable pocket calculator: the HP-65. with its own external memory and built-in magnetic card reader.

Now you can afford a silent business partner. Meet your new silent partner at: Albert Photo; Alley Traders Pte Ltd; Boon & Co. Pte Ltd; Fototronic Enterprise; Mechanical & Combustion Engineering Co. Pte Ltd (MECOMB); Peter Chew’s; Robinson & Co Ltd; Safari Departmental Store; Sound Electric Centre; Victory Electronic Enterprise. Published: TST, 24 September 1974, Page 14- Hewlett-Packard Singapore Pte Ltd

1974.08.21 The HP-80 The most revolutionary financial device of our time is just one example of the kind of calculators we offer. Published: TST, 21 August 1974, Page 4 - Hewlett-Packard Singapore Pte. Ltd. TST, 11 September 1974, Page 14 - Hewlett-Packard Singapore Pte. Ltd. TST, 23 October 1974, Page 8 - Hewlett-Packard Singapore Pte. Ltd.