https://wikiti.brandonw.net/api.php?action=feedcontributions&feedformat=atom&user=Grifferz 2026-04-06T02:38:10Z User contributions MediaWiki 1.23.5 https://wikiti.brandonw.net/index.php?title=83Plus:Ports:00 2006-03-13T01:27:11Z

<p>Grifferz: </p> <hr /> <div>[[Category:83Plus:Ports:By_Address|00 - Link]] [[Category:83Plus:Ports:By_Name|Link]]<br /> == Synopsis ==<br /> '''Port Number:''' 00h<br /> <br /> '''Function:''' Link<br /> <br /> This port controls the calculator's serial link port (the standard link port present on the 83+, 83+ SE, 84+ and 84+ SE - do not confuse this with the 84+/84+SE's USB link port).<br /> <br /> === Read Values ===<br /> * Bits 0 and 1: The low 2 bits indicate the state of the link port's two lines. A 1 bit indicates a high line, and a 0 bit indicates a low line. When idle (no transfer in progress, no cable plugged in, etc), both lines are usually high (1). When a cable is connected on both ends, a line reads high if and only if both ends have set the line high. The line will read low if either calculator sets it low.<br /> *'''83+ only:''' Bit 2: Set means link receive assist is active.<br /> *'''83+ only:''' Bit 3: Set when link assist has received a complete byte. The only way to reset this bit is to read [[83Plus:Ports:05|port 5]].<br /> * Bit 4 and 5: Bits 4 and 5 indicate which lines are pulled low by the calculator (unlike bits 0 and 1 they are not influenced by the other calculator). A 1 bit indicates your calculator is holding the line low. A 0 bit indicates your calculator is not holding the line low. (When both calculators have a 0 bit here, the corresponding line will read 1.) In other words, these bits reflect bits 0 and 1 from the most recent write to this port.<br /> <br /> === Write Values ===<br /> * Bits 0 and 1: The low 2 bits indicate what state the lines should be put into. A 1 bit will pull the line low. A 0 bit will stop holding the line low (allowing it to go high if the other calculator is not holding it low).<br /> *'''83+ only:''' Bit 2: Set this bit to enable the link receive assist. After setting this bit, poll port 0 until bit 3 is high, at which point read from [[83Plus:Ports:05|port 5]] to get the byte.<br /> &lt;br&gt;<br /> <br /> == Comments ==<br /> <br /> === Ti-OS interference ===<br /> One thing to keep in mind when writing link port related software is that the Ti-OS checks for silent transfers in the background. When two calculators are connected and one pulls a line low, the other calculator will respond by pulling the other line low to acknowledge that it has received a bit. This phenomenon is known to cause severe headaches for programmers who attempt to write synchronization routines :). It's unclear if this is only when the other calculator is in the homescreen, or if it is part of the default interrupt routine at $0038.<br /> <br /> === Data transfer ===<br /> Transferring an entire byte requires you to implement some form of protocol. Examples include TI's official linking protocol, and [http://www.ticalc.org/archives/files/fileinfo/277/27718.html Michael Vincent's TachyonLink protocol].<br /> <br /> Other useful information on linking in general:<br /> * [http://www.ticalc.org/archives/files/fileinfo/247/24750.html TI Link Protocol &amp; File Format Guide]&lt;br&gt;<br /> * [http://www.ticalc.org/archives/files/fileinfo/294/29418.html Ti-83 Link Port Tutorial]<br /> * [http://www.ticalc.org/archives/files/fileinfo/242/24244.html All about the Ti-86 link port]<br /> <br /> == Example ==<br /> <br /> === Sending/Setting ===<br /> &lt;nowiki&gt; ld a,0 ; Set both lines high<br /> out (0),a<br /> <br /> ld a,2 ; Set tip high, ring low<br /> out (0),a<br /> <br /> ld a,1 ; Set tip low, ring high<br /> out (0),a<br /> <br /> ld a,3 ; Set both low<br /> out (0),a&lt;/nowiki&gt;<br /> <br /> === Receiving/Reading ===<br /> &lt;nowiki&gt; in a,(0) ; Get the link port value<br /> <br /> bit 0,a ; Check tip<br /> jr z,tip_low<br /> jr nz,tip_high<br /> <br /> bit 1,a ; 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Grifferz https://wikiti.brandonw.net/index.php?title=83Plus:Ports:00 2006-03-12T19:00:09Z

<p>Grifferz: </p> <hr /> <div>[[Category:83Plus:Ports:By_Address|00 - Link]] [[Category:83Plus:Ports:By_Name|Link]]<br /> == Synopsis ==<br /> '''Port Number:''' 00h<br /> <br /> '''Function:''' Link<br /> <br /> This port controls the calculator's serial link port (the standard link port present on the 83+, 83+ SE, 84+ and 84+ SE - do not confuse this with the 84+/84+SE's USB link port).<br /> <br /> === Read Values ===<br /> * Bits 0 and 1: The low 2 bits indicate the state of the link port's two lines. A 1 bit indicates a high line, and a 0 bit indicates a low line. When idle (no transfer in progress, no cable plugged in, etc), both lines are usually high (1). When a cable is connected on both ends, a line reads high if and only if both ends have set the line high. The line will read low if either calculator sets it low.<br /> *'''83+ only:''' Bit 2: Set means link receive assist is active.<br /> *'''83+ only:''' Bit 3: Set when link assist has received a complete byte. The only way to reset this bit is to read [[83Plus:Ports:05|port 5]].<br /> * Bit 4 and 5: Bits 4 and 5 indicate which lines are pulled low by the calculator (unlike bits 0 and 1 they are not influenced by the other calculator). A 1 bit indicates your calculator is holding the line low. A 0 bit indicates your calculator is not holding the line low. (When both calculators have a 0 bit here, the corresponding line will read 1.) In other words, these bits reflect bits 0 and 1 from the most recent write to this port.<br /> <br /> === Write Values ===<br /> * Bits 0 and 1: The low 2 bits indicate what state the lines should be put into. A 1 bit will pull the line low. A 0 bit will stop holding the line low (allowing it to go high if the other calculator is not holding it low).<br /> *'''83+ only:''' Bit 2: Set this bit to enable the link receive assist. After setting this bit, poll port 0 until bit 3 is high, at which point read from [[83Plus:Ports:05|port 5]] to get the byte.<br /> &lt;br&gt;<br /> <br /> == Comments ==<br /> <br /> === Ti-OS interference ===<br /> One thing to keep in mind when writing link port related software is that the Ti-OS checks for silent transfers in the background. When two calculators are connected and one pulls a line low, the other calculator will respond by pulling the other line low to acknowledge that it has received a bit. This phenomenon is known to cause severe headaches for programmers who attempt to write synchronization routines :). It's unclear if this is only when the other calculator is in the homescreen, or if it is part of the default interrupt routine at $0038.<br /> <br /> === Data transfer ===<br /> Transferring an entire byte requires you to implement some form of protocol. Examples include TI's official linking protocol, and [http://www.ticalc.org/archives/files/fileinfo/277/27718.html Michael Vincent's TachyonLink protocol].<br /> <br /> Other useful information on linking in general:<br /> * [http://www.ticalc.org/archives/files/fileinfo/247/24750.html TI Link Protocol &amp; File Format Guide]&lt;br&gt;<br /> * [http://www.ticalc.org/archives/files/fileinfo/294/29418.html Ti-83 Link Port Tutorial]<br /> * [http://www.ticalc.org/archives/files/fileinfo/242/24244.html All about the Ti-86 link port]<br /> <br /> == Example ==<br /> <br /> === Sending/Setting ===<br /> &lt;nowiki&gt; ld a,0 ; Set both lines high<br /> out (0),a<br /> <br /> ld a,2 ; Set tip high, ring low<br /> out (0),a<br /> <br /> ld a,1 ; Set tip low, ring high<br /> out (0),a<br /> <br /> ld a,3 ; Set both low<br /> out (0),a&lt;/nowiki&gt;<br /> <br /> === Receiving/Reading ===<br /> &lt;nowiki&gt; in a,(0) ; Get the link port value<br /> <br /> bit 0,a ; Check tip<br /> jr z,tip_low<br /> jr nz,tip_high<br /> <br /> bit 1,a ; 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Grifferz https://wikiti.brandonw.net/index.php?title=83Plus:Ports:00 2006-03-12T03:32:19Z

<p>Grifferz: </p> <hr /> <div>[[Category:83Plus:Ports:By_Address|00 - Link]] [[Category:83Plus:Ports:By_Name|Link]]<br /> == Synopsis ==<br /> '''Port Number:''' 00h<br /> <br /> '''Function:''' Link<br /> <br /> This port controls the calculator's serial link port (the standard link port present on the 83+, 83+ SE, 84+ and 84+ SE - do not confuse this with the 84+/84+SE's USB link port).<br /> <br /> === Read Values ===<br /> * Bits 0 and 1: The low 2 bits indicate the state of the link port's two lines. A 1 bit indicates a high line, and a 0 bit indicates a low line. When idle (no transfer in progress, no cable plugged in, etc), both lines are usually high (1). When a cable is connected on both ends, a line reads high if and only if both ends have set the line high. The line will read low if either calculator sets it low.<br /> *'''83+ only:''' Bit 2: Set means link receive assist is active.<br /> *'''83+ only:''' Bit 3: Set when link assist has received a complete byte. The only way to reset this bit is to read [[83Plus:Ports:05|port 5]].<br /> * Bit 4 and 5: Bits 4 and 5 indicate which lines are pulled low by the calculator (unlike bits 0 and 1 they are not influenced by the other calculator). A 1 bit indicates your calculator is holding the line low. A 0 bit indicates your calculator is not holding the line low. (When both calculators have a 0 bit here, the corresponding line will read 1.) In other words, these bits reflect bits 0 and 1 from the most recent write to this port.<br /> <br /> === Write Values ===<br /> * Bits 0 and 1: The low 2 bits indicate what state the lines should be put into. A 1 bit will pull the line low. A 0 bit will stop holding the line low (allowing it to go high if the other calculator is not holding it low).<br /> *'''83+ only:''' Bit 2: Set this bit to enable the link receive assist. After setting this bit, poll port 0 until bit 3 is high, at which point read from [[83Plus:Ports:05|port 5]] to get the byte.<br /> &lt;br&gt;<br /> <br /> == Comments ==<br /> <br /> === Ti-OS interference ===<br /> One thing to keep in mind when writing link port related software is that the Ti-OS checks for silent transfers in the background. When two calculators are connected and one pulls a line low, the other calculator will respond by pulling the other line low to acknowledge that it has received a bit. This phenomenon is known to cause severe headaches for programmers who attempt to write synchronization routines :). It's unclear if this is only when the other calculator is in the homescreen, or if it is part of the default interrupt routine at $0038.<br /> <br /> === Data transfer ===<br /> Transferring an entire byte requires you to implement some form of protocol. Examples include TI's official linking protocol, and [http://www.ticalc.org/archives/files/fileinfo/277/27718.html Michael Vincent's TachyonLink protocol].<br /> <br /> Other useful information on linking in general:<br /> * [http://www.ticalc.org/archives/files/fileinfo/247/24750.html TI Link Protocol &amp; File Format Guide]&lt;br&gt;<br /> * [http://www.ticalc.org/archives/files/fileinfo/294/29418.html Ti-83 Link Port Tutorial]<br /> * [http://www.ticalc.org/archives/files/fileinfo/242/24244.html All about the Ti-86 link port]<br /> <br /> == Example ==<br /> <br /> === Sending/Setting ===<br /> &lt;nowiki&gt; ld a,0 ; Set both lines high<br /> out (0),a<br /> <br /> ld a,2 ; Set tip high, ring low<br /> out (0),a<br /> <br /> ld a,1 ; Set tip low, ring high<br /> out (0),a<br /> <br /> ld a,3 ; Set both low<br /> out (0),a&lt;/nowiki&gt;<br /> <br /> === Receiving/Reading ===<br /> &lt;nowiki&gt; in a,(0) ; Get the link port value<br /> <br /> bit 0,a ; Check tip<br /> jr z,tip_low<br /> jr nz,tip_high<br /> <br /> bit 1,a ; 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