83Plus:Ports:25 - Revision history

Thepenguin77: All by me today are fixing the 83+ port numbers

2011-10-28T03:08:32Z

All by me today are fixing the 83+ port numbers

Dr. D'nar at 06:49, 29 June 2011

2011-06-29T06:49:20Z

Dr. D'nar: added default value

2011-06-28T23:04:45Z

added default value

Deep Thought: /* See Also */

2011-06-28T23:01:15Z

‎See Also

Deep Thought: /* Comments */

2011-06-28T23:00:46Z

‎Comments

Dr. D'nar at 21:19, 28 June 2011

2011-06-28T21:19:13Z

Dr. D'nar: Quick summary

2011-06-28T21:18:07Z

Quick summary

New page

[[Category:83Plus:Ports:By_Address:Protected|25 - RAM Execution Lower Limit]] [[Category:83Plus:Ports:By_Address|25 - RAM Execution Lower Limit]] [[Category:83Plus:Ports:By_Name|RAM Execution Lower Limit]]
{{SE-Only Port|03}}
{{Protected Port}}

== Synopsis ==
'''Port Number:''' 25h

'''Function:''' Controls the RAM Execution Lower Limit

This port control the lower 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 lowest 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 below 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 25: / Line 25: @@
 == See Also ==
 * [[83Plus:Ports:26|Port 26]]

@@ 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 below 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 below the limit set here will cause a reset.  The typical default value is 10h.
 == See Also ==
 * [[83Plus:Ports:26|Port 26]]

← Older revision		Revision as of 23:01, 28 June 2011
Line 24:		Line 24:

	== See Also ==		== See Also ==
−	* [[83Plus:Ports:23\|Port 26]]	+	* [[83Plus:Ports:26\|Port 26]]

← Older revision		Revision as of 23:00, 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 below 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 below the limit set here will cause a reset.
		+
		+	== See Also ==
		+	* [[83Plus:Ports:23\|Port 26]]

@@ Line 1: / Line 1: @@
 [[Category:83Plus:Ports:By_Address:Protected|25 - RAM Execution Lower Limit]] [[Category:83Plus:Ports:By_Address|25 - RAM Execution Lower Limit]] [[Category:83Plus:Ports:By_Name|RAM Execution Lower Limit]]
-{{SE-Only Port|03}}
+{{SE-Only Port|05}}
 {{Protected Port}}