83Plus:Ports:05 - Revision history

Sircmpwn at 16:44, 9 August 2011

2011-08-09T16:44:23Z

2011-05-04T04:00:26Z

‎Comments: ...assuming boot version 1.00

2011-05-02T22:14:18Z

‎Comments

2011-05-02T22:11:33Z

2009-06-12T16:51:23Z

‎Credits and Contributions: change url

2007-04-13T02:38:23Z

2007-01-27T23:04:56Z

‎Credits and Contributions

2006-03-16T21:35:42Z

Tidied up language and removed text which isn't applicable on 84P

2006-03-15T18:34:12Z

Renamed(Seems to long), revert if you disagree

2005-07-21T19:37:44Z

+ link assist on 83+

@@ Line 43: / Line 43: @@
 == Comments ==
-It has been tested and confirmed that you can unlock RAM 00 on a Ti-83+ by using this port in conjunction with port $16.  This allows you to run code in the $C000-$FFFF area.  Once you succeed in unlocking flash, the following code can be used to unlock RAM page 0:
+It has been tested and confirmed that you can unlock RAM 00 on a Ti-83+ by using this port in conjunction with port $16.  This allows you to run code in the $C000-$FFFF area.  Once you succeed in unlocking flash, the following code can be used to unlock RAM page 0 from within TIOS:
-  <nowiki>&nbsp;;Tested on OS 1.16 - 1.19
+  <nowiki>;Tested on OS 1.16 - 1.19
     ld a, %00000111

@@ Line 52: / Line 52: @@
     out ($06), a
     xor a
-    call $46DA</nowiki>
+    call $46DA  ; (assuming boot version 1.00; if you wanted to make
 At least on my TI-84+, if you output a value with bit 3 set, reading from the port will return a value with bit 3 set. This would imply that you can use RAM pages 08h-0Fh, but these RAM pages do not exist--this bit is simply ignored (only bits 0-2 actually determine what RAM page is active.)

@@ Line 51: / Line 51: @@
     ld a, $1F
     out ($06), a
-    ld a, 1
+    xor a
     call $46DA</nowiki>

← Older revision		Revision as of 22:11, 2 May 2011
Line 42:		Line 42:

	== Comments ==		== Comments ==
		+
		+	It has been tested and confirmed that you can unlock RAM 00 on a Ti-83+ by using this port in conjunction with port $16. This allows you to run code in the $C000-$FFFF area. Once you succeed in unlocking flash, the following code can be used to unlock RAM page 0:
		+
		+	<nowiki> ;Tested on OS 1.16 - 1.19
		+
		+	ld a, %00000111
		+	out ($05), a
		+	ld a, $1F
		+	out ($06), a
		+	ld a, 1
		+	call $46DA</nowiki>
		+
	At least on my TI-84+, if you output a value with bit 3 set, reading from the port will return a value with bit 3 set. This would imply that you can use RAM pages 08h-0Fh, but these RAM pages do not exist--this bit is simply ignored (only bits 0-2 actually determine what RAM page is active.)		At least on my TI-84+, if you output a value with bit 3 set, reading from the port will return a value with bit 3 set. This would imply that you can use RAM pages 08h-0Fh, but these RAM pages do not exist--this bit is simply ignored (only bits 0-2 actually determine what RAM page is active.)

@@ Line 46: / Line 46: @@
 == Credits and Contributions ==
 * '''Michael Vincent:''' Initial documentation.
-* '''Tijl Coosemans:''' Documenting TI-83 Plus functionality [http://kalimero.be/83phwinfo.txt here].
+* '''Tijl Coosemans:''' Documenting TI-83 Plus functionality [http://tijl.ulyssis.be/83phwinfo.txt here].

@@ Line 24: / Line 24: @@
 === Write Values ===
-Writing a set bit to 16h protects the page; writing a clear bit unprotects the page.
+Writing a set bit to 16h protects the page; writing a clear bit unprotects the page.  The value of port 05h affects which bits of port 16h are acted on.  An 'X' in the table indicates the bit is ignored.
 {|align="center" border="1" cellpadding="1" style="text-align: center"

@@ Line 5: / Line 5: @@
 '''Function:''' RAM Paging Port
-This port can be used to control what RAM page is paged into the C000h-FFFFh memory bank. Note that it can only page RAM pages, not flash pages.
+This port can be used to control what RAM page is paged into the C000h-FFFFh memory bank. Note that it can only map RAM pages, not flash pages.
 === Read Values ===
-Returns the current RAM pages.
+Returns the current RAM page.
 === Write Values ===
-Sets the current RAM page, by giving a value in 00h-07h, inclusive. When you work with the other paging ports, RAM pages are given in 80h-87h, but this port does not need bit 7 to be set. You cannot set the upper four bits.
+Sets the current RAM page, by giving a value in 00h-07h, inclusive.
 == Synopsis (TI-83 Plus) ==

@@ Line 1: / Line 1: @@
-[[Category:83Plus:Ports:By_Address|05 - RAM Page (83+SE, 84+/SE) - Port 16 Configuration/Link Assist Read (83+)]] [[Category:83Plus:Ports:By_Name|RAM Page (83+SE, 84+/SE) - Port 16 Configuration/Link Assist Read (83+)]]
+[[Category:83Plus:Ports:By_Address|05 - RAM Page(SE) - Port 16 Config/Link Assist(83+)]] [[Category:83Plus:Ports:By_Name|RAM Page(SE) - Port 16 Config/Link Assist(83+)]]
 == Synopsis (TI-83 Plus S.E. and TI-84 Plus Family) ==
 '''Port Number:''' 05h

@@ Line 1: / Line 1: @@
-[[Category:83Plus:Ports:By_Address|05 - RAM Page (83+SE, 84+/SE) - Port 16 Configuration (83+)]] [[Category:83Plus:Ports:By_Name|RAM Page (83+SE, 84+/SE) - Port 16 Configuration (83+)]]
+[[Category:83Plus:Ports:By_Address|05 - RAM Page (83+SE, 84+/SE) - Port 16 Configuration/Link Assist Read (83+)]] [[Category:83Plus:Ports:By_Name|RAM Page (83+SE, 84+/SE) - Port 16 Configuration/Link Assist Read (83+)]]
 == Synopsis (TI-83 Plus S.E. and TI-84 Plus Family) ==
 '''Port Number:''' 05h
@@ Line 16: / Line 16: @@
 '''Port Number:''' 05h
-'''Function:''' [[83Plus:Ports:16|Port 16h]] Configuration Port
+'''Function:''' [[83Plus:Ports:16|Port 16h]] Configuration Port/Link Assist Read
-This port configures which memory pages are locked or unlocked (i.e. whether or not the PC register is allowed to point within the page) by port 16h. Only bits 0..2 are considered, the rest have no effect.
+This port configures which memory pages are locked or unlocked (i.e. whether or not the PC register is allowed to point within the page) by port 16h. Only bits 0..2 are considered, the rest have no effect. Also, this port is used to read the last byte the link assist received.
 === Read Values ===
-Nothing of value.
+The last byte received by the link assist (see [[83Plus:Ports:00|port 0]] for more information).
 === Write Values ===