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TI-55: Difference between revisions
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[[Category:Pocket calculator]] | [[Category:Pocket calculator]] | ||
[[Category:Bubble LED]] | [[Category:Bubble LED]] | ||
{{Infobox calculator|name=TI-55|introduced=1977|prog_lang=Keystroke|supply=9V (stepped up from 2.4V supplied by internal battery pack), 5.7-8.6V external AC power supply|dimensions=145(l) x 80(w) x 45(h)mm|ports=DC power connector (on BP7 battery pack)|display_type=[[Bubble LED]]|power=120mW in power on state, 80mW in standby}} | {{Infobox calculator|name=TI-55|introduced=1977|prog_lang=Keystroke|supply=9V (stepped up from 2.4V supplied by internal battery pack), 5.7-8.6V external AC power supply|dimensions=145(l) x 80(w) x 45(h)mm|ports=DC power connector (on BP7 battery pack)|display_type=[[Bubble LED]]|power=120mW in power on state, 80mW in standby|image=Image:TI-55.jpg}} | ||
The '''TI-55''' was an early programmable scientific calculator released by [[Texas Instruments]] in 1977. | The '''TI-55''' was an early programmable scientific and financial calculator released by [[Texas Instruments]] in 1977. | ||
== Features == | == Features == | ||
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Battery power is provided by the Texas Instruments BP7 rechargeable battery pack. The BP7 contains two AA nickel-cadmium rechargeable cells, along with a board containing the the internal and external power connectors along with a DC-DC converter to boost the 2.4V output of the cells to 9V for use by the calculator. The external power connector accepts power supplies ranging from 5.7V to 8.6V AC. The internal power connector has two wires, red for negative and black for positive, inverted from the standard wiring colours. | Battery power is provided by the Texas Instruments BP7 rechargeable battery pack. The BP7 contains two AA nickel-cadmium rechargeable cells, along with a board containing the the internal and external power connectors along with a DC-DC converter to boost the 2.4V output of the cells to 9V for use by the calculator. The external power connector accepts power supplies ranging from 5.7V to 8.6V AC. The internal power connector has two wires, red for negative and black for positive, inverted from the standard wiring colours. | ||
== Gallery == | |||
<gallery> | |||
File:TI BP7 internal.jpg|Internal design of the BP7 battery pack used in the TI-55 | |||
</gallery> | |||
== External resources == | == External resources == | ||