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On The Casio Prizm and Link Port Hacks
Published by KermMartian on September 4, 2011 at 12:29:55 AM CST | Discuss this article (12)

Among the most popular hardware-hacking projects for the humble 6MHz TI-83+ and 15MHz TI-84+ series of graphing calculators have perenially been those involving the link port. Also called the I/O port or the serial port, it consists of two bidirectional data lines, both of which can be written and read directly by assembly programs. From quadraphonic music players to IR transceivers to networking protocols to modding PS/2 ports and touchpads into calculators, the port enables a variety of intriguing projects. It was of course with great excitement that the TI calculator enthusiast community and Cemetech approached the Casio Prizm, a calculator that appears to have a link cable and port matching the 2.5mm stereo arrangement of the TI calculators, backed by the power of a fast SH3 CPU and megabytes of memory.

Unfortunately, current experiments indicate that the Casio Prizm link port is not designed equivalently to the TI link port from an electronic perspective. The link cable is a crossover type, a strong indicator that the link ports all contain ground and unidirectional RX and TX data lines, respectively an input and an output. As far as trivial data transfer, Jonimus and Tari's Cemetech Prizm SDK has exposed three functions, Serial_Open(), Serial_DirectTransmitOneByte(), and Serial_Close() for point-to-point communication. On the minus side, if further exploration reveals that the port can indeed only perform unidirectional transfer on each data line, then music players will be restricted to monaural sound, a CALCnet 2.2 port to the Prizm will not be possible, and the potential for other point-to-multipoint networking protocols for the devices will be sorely limited. Of course, it may be that a more limited port could present additional positive engineering challenges to the community, especially to Cemetech, where we enjoy fleshing out our software hacking with hardware design. For example, the high throughput the Prizm can achieve could be exploited to hand off data to a helper microcontroller translating to calcNET or buffering audio data for output. And indeed, some hardware hacks like IR transception will work just as well with one input and one output line as with two bidirectional communication lines.

I encourage my fellow Cemetechians to continue to pursue this aspect of the Prizm and Casio Prizm coding in general, as the platform remains open to powerful C programs even as competing platforms continue to offer only limited programming tools, at least an improvement over offering no such tools whatsoever. What are you planning to do with your Prizm in the near future? Share in the topic below!

As a final note, the Casio enthusiast community did some similar research of the Casio FX-9860g link port, and drew many conclusions relevant to the Prizm's link port.



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2011 Articles
January 2011 January 2011 [Back to News Archives Index]

» First globalCALCnet (gCn) Successes published January 3, 2011 by KermMartian
» gCn-Enabled TI-83+ Calculator Joins IRC published January 6, 2011 by KermMartian
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» CALCnet Chat! v0.9 Beta published January 14, 2011 by KermMartian
» gCn Client v0.8 Beta; Online Calculators Rejoice published January 16, 2011 by KermMartian
» [CALCnet] Obliterate, a Scorched-Earth Multiplayer Game published January 20, 2011 by KermMartian
» CALCnet Chat! v1.0: IM and IRC for Calculators published January 28, 2011 by KermMartian

February 2011 February 2011 [Back to News Archives Index]

» Stats: 40K and More; Awards; Latest Projects published February 5, 2011 by KermMartian
» GlobalCALCnet "$10 Bridge", gCn 1.0 Near Completion published February 9, 2011 by KermMartian
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» globalCALCnet Slashdotted, Obliterate Progress published February 22, 2011 by KermMartian
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March 2011 March 2011 [Back to News Archives Index]

» Casio Prizm: Why TI Calc Coders Should Abandon the Nspire CX published March 6, 2011 by KermMartian
» Obliterate v1.0: Scorched Earth for Your Calc published March 7, 2011 by KermMartian
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» First Direct USB gCn Successes published March 15, 2011 by KermMartian
» Cemetech Goes on a Retreat published March 21, 2011 by KermMartian
» Doors CS 7.2 Beta 1: DUSB gCn published March 22, 2011 by KermMartian
» Benumbered v2.0 published March 31, 2011 by KermMartian
» Presenting "Cemetech Retro" published March 31, 2011 by KermMartian

April 2011 April 2011 [Back to News Archives Index]

» Half a Year of HCWP published April 6, 2011 by KermMartian
» One Hundred Fifty Thousand Posts published April 8, 2011 by KermMartian
» Staff Page, Promotions, Prizm Gaming Begins published April 16, 2011 by KermMartian

May 2011 May 2011 [Back to News Archives Index]

» Cemetech Advances Casio Prizm Coding published May 2, 2011 by KermMartian
» URL Shortener: Cemete.ch published May 16, 2011 by KermMartian
» Resurrected: PartyMode 2.0 published May 17, 2011 by KermMartian
» [Prizm] Obliterate Beta 1 published May 24, 2011 by KermMartian

June 2011 June 2011 [Back to News Archives Index]

» Nspire Saga: TI Reaches Out published June 2, 2011 by KermMartian
» [Review] Minecraft: A Freebuilder's Perspective published June 3, 2011 by KermMartian
» Introducing Gossamer 1.0: A Calculator Web Browser published June 9, 2011 by KermMartian
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July 2011 July 2011 [Back to News Archives Index]

» Gossamer 1.0 Gains Notoriety; Project Updates published July 25, 2011 by KermMartian

August 2011 August 2011 [Back to News Archives Index]

» The Cemetech Prizm SDK v0.2 published August 11, 2011 by KermMartian
» Spiffy Cemetech Prizm Skins published August 13, 2011 by KermMartian
» Upcoming: Sandpaper FTP Client published August 17, 2011 by KermMartian
» Cemetech Goes to Space published August 21, 2011 by KermMartian
» GPS2KML published August 22, 2011 by KermMartian
» Cemetech's New Focus; Hurricane Irene published August 28, 2011 by KermMartian

September 2011 September 2011 [Back to News Archives Index]

» On The Casio Prizm and Link Port Hacks published September 4, 2011 by KermMartian
» [Prizm] Obliterate 1.0 published September 7, 2011 by KermMartian
» Back To School 2011: Cemetech's Calculator Guide published September 9, 2011 by KermMartian

October 2011 October 2011 [Back to News Archives Index]

» Latest Cemetech Prizm Projects, SourceCoder Prizm Support published October 8, 2011 by KermMartian
» Have Calc, Will Program: One Year Later published October 12, 2011 by KermMartian
» Play [Games] on Your TI-83+/SE or TI-84+/SE published October 21, 2011 by KermMartian
» Casio Prizm OS 1.03 Released published October 21, 2011 by JosJuice

November 2011 November 2011 [Back to News Archives Index]

» Social Media: Connect with Cemetech! published November 8, 2011 by KermMartian
» Cemetech Contest #8: Arcade Games published November 20, 2011 by KermMartian
» [Prizm] In Progress: Tetrizm published November 21, 2011 by KermMartian
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December 2011 December 2011 [Back to News Archives Index]

» [Prizm] Periodic Table of the Elements published December 2, 2011 by KermMartian
» Contest 8: Five Weeks Left, Great Response published December 13, 2011 by KermMartian
» Door-Mounted E-Paper Information Panel published December 14, 2011 by KermMartian
» Merry Christmas, Happy Holidays; Upcoming Projects published December 25, 2011 by KermMartian
» Build Your Own Calculator-Floppy Drive Music System published December 30, 2011 by KermMartian
» ticalc.org 2011 POTY: Two Cemetech Wins published December 31, 2011 by KermMartian

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