Re: The Great Debate of '76 Message #20 Posted by Mike Morrow on 18 Apr 2012, 2:08 p.m., in response to message #1 by Matt Agajanian
The years 1974 to 1978 were my most intense period of new calculator purchase and use.
In 1976, HP had the HP-65, 25, and 55 programmables. TI had the SR-52 to compete with the HP-65, and the SR-56 to compete against either the HP-25 or HP-55, though the HP-55 never had enough general appeal to be worth discussing. I bought an SR-56, and I consider it today still to be superior to those HP offerings except for the mag card HP-65. But the SR-52 was a more-than-adequate foil to the HP-65.
By 1977, the HP-67 and HP-97 were available and grossly superior to the TI offerings for most purposes. But TI quickly countered with the TI-59 with an extraordinary amount of RAM (for the time) and large mag card storage...plus the innovative solid state software modules. It was also only two-thirds the cost of the HP-67. I managed to scrape up enough funds to buy first the HP-67, then the TI-59. There was no doubt in my mind that although the 67 was far more efficient for program size and built of far higher quality, the TI-59 was the 1977 state-of-the-art (as long as I could keep one working...I went through five TI-59s and three PC-100s in three years).
Because of the reliability problems with the TI products, I wrote my critical applications for use on a S5W naval propulsion reactor on the HP-67, and I had my ship command buy a HP-97 to execute my programming when I left the service. HP quality definitely won over TI quality.
One area often left out when comparing calculators of this era is the availability of printed output. There was no way to get printed output from the HP scientific programmable hand-helds. The only possibility was using the larger and much more expensive HP-97. OTOH, TI produced the SR-51, SR-52, SR-56, TI-58, and TI-59 hand-helds that could quickly be positioned on the PC-100 print cradle (through the battery pack port) for effective and economical thermal paper printer output. The PC-100 also powered the calculator from AC power at the same time. That was great for programs running unattended for long periods of time. The combo of the TI-59 and the PC-100, along with a selection of solid-state software modules, resulted in performance that grossly exceeded the best that HP had to offer by the early 1978. That situation lasted until the era of the 1979 HP-41C, for which TI never marketed a satisfactory competitor as a scientific programmable.
Today, the 1977 situation is reversed. In 2003, the HP 49g+ introduced massive amounts of storage in the form of SD cards, along with excellent display quality and support for IR output to a small inexpensive printer. It integrates a sophisticated set of supplied low-level development tools, and (since the 50g) it can be powered externally by USB cable. The TI 89 competitor has during the same time been through several hardware revisions (now hardware version 4) and still has no SD card capability, no easy way to print, no easy way to power externally, no included low-level development tools, and an absolutely horrific quality of LCD.
Today's HP 50g towers over today's TI 89 Titanium (HW4) in capability more than the TI-59/PC-100 did over the HP-67 in 1977. It's just too bad that handheld calculators are not very important any more.
Edited: 18 Apr 2012, 2:29 p.m.
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