83Plus:Ports:2C - Revision history

Thepenguin77 at 03:49, 28 October 2011

2011-10-28T03:49:48Z

Thepenguin77 at 03:10, 28 October 2011

2011-10-28T03:10:27Z

Thepenguin77 at 22:45, 5 July 2011

2011-07-05T22:45:35Z

Jim e: added 2e info

2006-03-14T14:04:05Z

added 2e info

Jim e: tied to 2e

2005-08-22T11:24:42Z

tied to 2e

Jim e: Forgot to rename, darn copy paste

2005-08-21T20:39:25Z

Forgot to rename, darn copy paste

Jim e: Added page.

2005-08-21T20:38:15Z

Added page.

New page

[[Category:83Plus:Ports:By Address|2B - LCD Delay(15 MHz)(03)]] [[Category:83Plus:Ports:By Name|LCD Delay (15 MHz)(03)]]
{{SE-Only Port|04}}

== Synopsis ==
'''Port Number:''' 2Ch

'''Function:''' LCD Delay (15 MHz)(03)

This port works in the same manner 29 does, but only when the calculator is set at 15mhz and if port 20 equals 03. It removes the amount of delay needed between accesses to the lcd driver by adding a delay to any instruction which reads from or writes to ports [[83Plus:Ports:10|10]] or [[83Plus:Ports:11|11]], as well as the mirror ports 12 and 13.

=== Usage ===

Bits 0 and 1 are unknown, but don't seem to directly remove the needed delay. They are set on both the 83+SE and 84+(SE).

Bits 2-7 control the amount of delay added at specified instructions. To calculate the number of clock cycles added divide the contents of port 2C by 4 and round off. '''NOTE:''' The contents of this port should NOT be less than 0Ch or the LCD will no longer update.

== Comments ==
This port is not available on the normal TI-83+. On the normal TI-83+ this port is a shadow of [[83Plus:Ports:04|Port 04h]].

Bits 0&1 seem to tie to port 2E, they affect the cpu speed reduction the port 2e controls. Though their exact purpose is not known.

The effect of this port is only seen if the contents of [[83Plus:Ports:20|port 20h]] equals 03.

== Credits and Contributions ==
* '''James Montelongo'''

@@ Line 1: / Line 1: @@
 [[Category:83Plus:Ports:By Address|2C - LCD Delay(15 MHz)(03)]] [[Category:83Plus:Ports:By Name|LCD Delay (15 MHz)(03)]]
-{{SE-Only Port|0C}}
+{{SE-Only Port|04}}
 == Synopsis ==

@@ Line 1: / Line 1: @@
 [[Category:83Plus:Ports:By Address|2C - LCD Delay(15 MHz)(03)]] [[Category:83Plus:Ports:By Name|LCD Delay (15 MHz)(03)]]
-{{SE-Only Port|04}}
+{{SE-Only Port|0C}}
 == Synopsis ==

@@ Line 12: / Line 12: @@
 * Bit 0 enables the effects of the flash delay controlled by port 2E.
 * Bit 1 enables the effects of the ram delay controlled by port 2E.
-* Bits 2-7 control the amount of delay added at specified instructions. To calculate the number of clock cycles added divide the contents of port 2C by 4 and round off. '''NOTE:''' The contents of this port should NOT be less than 0Ch or the LCD will no longer update.
+* Bits 2-7 control the amount of delay added at specified instructions. To calculate the number of clock cycles added divide the contents of port 2C by 4 and round off. '''NOTE:''' The contents of this port should NOT be less than 0Ch or the LCD driver will no longer respond.
 == Comments ==

@@ Line 10: / Line 10: @@
 === Usage ===
+* Bit 0 enables the effects of the flash delay controlled by port 2E.
-When Bit 1 is set the effects of speed adjustment [[83Plus:Ports:2E|port 2E]] can be seen.
+* Bit 1 enables the effects of the ram delay controlled by port 2E.
+* Bits 2-7 control the amount of delay added at specified instructions. To calculate the number of clock cycles added divide the contents of port 2C by 4 and round off. '''NOTE:''' The contents of this port should NOT be less than 0Ch or the LCD will no longer update.
 Bits 2-7 control the amount of delay added at specified instructions. To calculate the number of clock cycles added divide the contents of port 2C by 4 and round off. '''NOTE:''' The contents of this port should NOT be less than 0Ch or the LCD will no longer update.
 == Comments ==

← Older revision		Revision as of 20:39, 21 August 2005
Line 1:		Line 1:
−	[[Category:83Plus:Ports:By Address\|2B - LCD Delay(15 MHz)(03)]] [[Category:83Plus:Ports:By Name\|LCD Delay (15 MHz)(03)]]	+	[[Category:83Plus:Ports:By Address\|2C - LCD Delay(15 MHz)(03)]] [[Category:83Plus:Ports:By Name\|LCD Delay (15 MHz)(03)]]
	{{SE-Only Port\|04}}		{{SE-Only Port\|04}}

@@ Line 11: / Line 11: @@
 === Usage ===
-Bits 0 and 1 are unknown, but don't seem to directly remove the needed delay. They are set on both the 83+SE and 84+(SE).
+When Bit 1 is set the effects of speed adjustment [[83Plus:Ports:2E|port 2E]] can be seen.
 Bits 2-7 control the amount of delay added at specified instructions. To calculate the number of clock cycles added divide the contents of port 2C by 4 and round off. '''NOTE:''' The contents of this port should NOT be less than 0Ch or the LCD will no longer update.
@@ Line 17: / Line 17: @@
 == Comments ==
 This port is not available on the normal TI-83+. On the normal TI-83+ this port is a shadow of [[83Plus:Ports:04|Port 04h]].
 The effect of this port is only seen if the contents of [[83Plus:Ports:20|port 20h]] equals 03.