HP 82240: Difference between revisions

HP 82240 (edit)

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 {{Infobox calculator|name=HP 82240A|image=Image:HP 82240A.jpg|caption=A HP 82240A infrared thermal printer|successor=HP 82240B|predecessor=HP 82143A and HP 82242A|connection=Redeye infrared|ports=DC barrel jack, infrared receiver|processor=Toshiba TMP80C50AP}}The '''HP 82240''' series was a line of thermal printers that support infrared communication with many HP calculators and various other devices.{{Infobox calculator|name=HP 82240B|type=Printer|processor=OKI M80C50|predecessor=HP 82240A|ports=DC barrel jack, infrared receiver|connection=Redeye infrared}}Printing to 58mm (tolerance+0/-1) thermal paper using a Seiko Industries MTP201-G166 print head with bitmap capability, these machines were also used by many instruments from manufacturers other than HP. Its influence can still be seen today where many equipment and thermal printers still use protocols derived from those first used on the HP 82240.
-The printer is powered by four AA batteries and can accept alkaline or NiMH cells. External power is supplied via a common nonpolar 5.5mm/2.1mm AC jack. The manual calls for 9-12V AC or DC at 500-1500mA and thus can be used with most common barrel jack power supplies. The original power adapter HP 82241A is rated for 9V AC at 13.5VA. The printer works on either internal, external or a combination of both.
+The printer is powered by four AA batteries and can accept alkaline or NiMH cells. External power is supplied via a common nonpolar 5.5mm/2.1mm AC jack. The manual calls for 9-12V AC or DC at 500-1500mA and thus can be used with most common barrel jack power supplies. The original power adapter HP 82241A is rated for 9V AC at 13.5VA. The printer works on either internal, external or a combination of both. It is rated for 6000 lines of print on fresh sets of internal batteries.
 The IR receiver diode is mounted to the bottom left of the printer when viewed from the top, hidden behind an IR window. Printing distance is dependent on background IR levels, with correspondingly shorter range under incandescent fixtures or in sunlight. It is usually possible to print at 15cm or more when the IR diode is in field of view indoor.
+Maximum time to print a line is roughly 1.2 seconds with AC and 1.8 seconds without, accounting for the movement of print head.
+All variants were manufactured by the Singapore division of HP.
+It is unclear when HP discontinued the HP 82240 series, but it was assumed that this was in connection with HP reorganizing its overseas divisions. The Singaporean manufacturer may have continued production under unknown name for a short period after these were discontinued.
 ==HP 82240A==
+Introduced in 1986, this version implemented a modified Roman-8 character set, which HP continued to modify moving forward from the HP 18C with which it debuted. On later calculators a translation vector was used to map internal character codes to those used by the printer.
+Citing a desire to economize, this variant was manufactured with single sided PCB which was a departure from then HP practice.
+On the HP 82240A, a standby mode was implemented by the chipset, yet standby power drain was rather high, draining a set of fresh batteries within 2 days if the power switch was closed, thus the recommendation made by HP to always connect it to external power supplies.
 ==HP 82240B==
-The B revision was introduced together with the HP48 series of calculators. Notably, this version implemented the new ECMA94 character set of the HP48 generation. To remain backwards compatible with previous printers, HP 82240 defaulted to using modified Roman-8 character set unless an escape sequence was received, which switched it into ECMA 94. The calculator can also be set to enable OLDPR which implemented a translation layer to allow printing with limited characters from A variants on the 48 and later.
+The B revision was introduced in 1989, together with the HP48 series of calculators. Notably, this version implemented the new ECMA94 character set of the HP48 generation. To remain backwards compatible with previous printers, HP 82240 defaulted to using modified Roman-8 character set unless an escape sequence was received, which switched it into ECMA 94. The calculator can also be set to enable OLDPR which implemented a translation layer to allow printing with limited characters from A variants on the 48 and later.
-Two quality of life improvement was made to the 82240: a red LED was added next to the IR receiver diode behind the window to indicate to the user that the machine is on. The machine now turns itself into standby after roughly 10 minutes of inactivity to save battery life, turning off the indicator LED, unless the mains power is connected. The user has to manually cycle the switch to re-enable printing.
+Two quality of life improvement was made to the 82240: a red LED was added next to the IR receiver diode behind the window to indicate to the user that the machine is on. The machine now turns itself into standby after roughly 10 minutes of inactivity to save battery life, turning off the indicator LED, unless the mains power is connected. The user can simply press the advance paper key to wake the printer in this case.
-Hardware wise, the HP 82240B switched to a green double-sided PCB with additional circuits to implement hardware standby function.
+Hardware wise, the HP 82240B switched to a green double-sided PCB with additional circuits to implement hardware standby function. The chipset standby mode was not used.
 ==Supported calculators==
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 == Issues ==
-While the underlying cause is unclear, when a jam develops, the HP 82240 printhead can burn the thermal paper black or in worse case, ignite it. It is thus not recommended to have it print unsupervised.
+While the underlying cause is unclear, when a jam develops or when user forcefully pulls the paper, together with some key presses, the HP 82240 printhead can burn the thermal paper black or in worse case, ignite it. It is thus not recommended to have it print unsupervised.
 The Seiko printhead uses two rubber rollers for paper ingest, which are glued to the main roller bar. This part can fail and run free due to age subjected to storing conditions. A tell-tale sign when this issue develops is the shrinking of line margin or persistent failure to feed. Replacing the entire printhead assembly is required in this case.