83Plus:Ports:26 - Revision history

Thepenguin77 at 03:08, 28 October 2011

2011-10-28T03:08:52Z

Dr. D'nar at 06:48, 29 June 2011

2011-06-29T06:48:58Z

Thepenguin77 at 23:49, 28 June 2011

2011-06-28T23:49:07Z

Dr. D'nar: added default value

2011-06-28T23:05:12Z

added default value

Deep Thought: /* Synopsis */

2011-06-28T23:02:05Z

‎Synopsis

Deep Thought: /* Comments */

2011-06-28T23:01:54Z

‎Comments

Dr. D'nar: typo

2011-06-28T21:24:28Z

typo

Dr. D'nar: quick summary

2011-06-28T21:20:37Z

quick summary

New page

[[Category:83Plus:Ports:By_Address:Protected|26 - RAM Execution Upper Limit]] [[Category:83Plus:Ports:By_Address|26 - RAM Execution Upper Limit]] [[Category:83Plus:Ports:By_Name|RAM Execution Upper Limit]]
{{SE-Only Port|03}}
{{Protected Port}}

== Synopsis ==
'''Port Number:''' 26h

'''Function:''' Controls the RAM Execution Upper Limit. See port 25h.

This port control the upper limit of RAM execution. It maps the RAM memory space in 1024 byte segments as though it was one continuous address space:
* Page 80h: Addresses 000000h to 003FFFh
* Page 81h: Addresses 004000h to 007FFFh
* Page 82h: Addresses 008000h to 00BFFFh
etc.

=== Read Values ===
* [00h - FFh]: Multiply the value in this port by 400h to get the highest RAM address that can run code.

=== Write Values ===
* [00h - FFh]: Select a new lower limit.

== Comments ==
This port does not exist on the standard 83 Plus. See ports [[83Plus:Ports:05|5]] and [[83Plus:Ports:16|16]] instead. Execution of code on addresses above the limit set here will cause a reset.

@@ Line 12: / Line 12: @@
 * Page 81h: Addresses 004000h to 007FFFh
 * Page 82h: Addresses 008000h to 00BFFFh
-etc.
+etc. The actual pages and addresses affected also depends on the masking applied by port 21.
 === Read Values ===
@@ Line 26: / Line 26: @@
 == See Also ==
 * [[83Plus:Ports:25|Port 25]]

@@ Line 15: / Line 15: @@
 === Read Values ===
-* [00h - FFh]: Multiply the value in this port by 400h to get the highest RAM address that can run code.
+* [00h - FFh]: Multiply the value in this port by 400h then add 3FFh to get the highest RAM address that can run code.
 === Write Values ===
@@ Line 21: / Line 21: @@
 == Comments ==
 This port does not exist on the standard 83 Plus.  See ports [[83Plus:Ports:05|5]] and [[83Plus:Ports:16|16]] instead.  Execution of code on addresses above the limit set here will cause a reset.  The typical default value is 20h.
 == See Also ==
 * [[83Plus:Ports:25|Port 25]]

@@ Line 21: / Line 21: @@
 == Comments ==
-This port does not exist on the standard 83 Plus.  See ports [[83Plus:Ports:05|5]] and [[83Plus:Ports:16|16]] instead.  Execution of code on addresses above the limit set here will cause a reset.
+This port does not exist on the standard 83 Plus.  See ports [[83Plus:Ports:05|5]] and [[83Plus:Ports:16|16]] instead.  Execution of code on addresses above the limit set here will cause a reset.  The typical default value is 20h.
 == See Also ==
 * [[83Plus:Ports:25|Port 25]]

← Older revision		Revision as of 23:01, 28 June 2011
Line 22:		Line 22:
	== Comments ==		== Comments ==
	This port does not exist on the standard 83 Plus. See ports [[83Plus:Ports:05\|5]] and [[83Plus:Ports:16\|16]] instead. Execution of code on addresses above the limit set here will cause a reset.		This port does not exist on the standard 83 Plus. See ports [[83Plus:Ports:05\|5]] and [[83Plus:Ports:16\|16]] instead. Execution of code on addresses above the limit set here will cause a reset.
		+	== See Also ==
		+	* [[83Plus:Ports:25\|Port 25]]

@@ Line 1: / Line 1: @@
 [[Category:83Plus:Ports:By_Address:Protected|26 - RAM Execution Upper Limit]] [[Category:83Plus:Ports:By_Address|26 - RAM Execution Upper Limit]] [[Category:83Plus:Ports:By_Name|RAM Execution Upper Limit]]
-{{SE-Only Port|03}}
+{{SE-Only Port|06}}
 {{Protected Port}}

@@ Line 6: / Line 6: @@
 '''Port Number:''' 26h
-'''Function:''' Controls the RAM Execution Upper Limit. See port 25h.
+'''Function:''' Controls the RAM Execution Upper Limit
 This port control the upper limit of RAM execution. It maps the RAM memory space in 1024 byte segments as though it was one continuous address space: