83Plus:Ports:28 - Revision history

Dr. D'nar: /* Comments */

2013-03-12T16:30:00Z

‎Comments

Thepenguin77 at 03:48, 28 October 2011

2011-10-28T03:48:51Z

Thepenguin77 at 03:09, 28 October 2011

2011-10-28T03:09:11Z

Buckeye Dude at 06:34, 29 June 2011

2011-06-29T06:34:14Z

Calc84maniac: /* Comments */

2007-03-01T15:37:10Z

‎Comments

Jim e: Spell check

2005-08-23T14:07:49Z

Spell check

AndyJ: reworded a bit, -{{wikify}}

2005-08-19T02:54:17Z

reworded a bit, -{{wikify}}

Jim e: SE only, got rid of stub

2005-08-08T18:33:56Z

SE only, got rid of stub

Jim e: Added info

2005-08-08T07:37:09Z

Added info

New page

[[Category:83Plus:Ports:By Address|28 - Block Memory Mapping 8000h]]
[[Category:83Plus:Ports:By Name|Block Memory Mapping 8000h]]
{{wikify}}{{stub}}
----

== Synopsis ==
'''Port Number:''' 28h

'''Function:''' Block Memory Mapping 8000h

By an order of 64 bytes per block, this port can re-map data from ram page 1 to reflect the memory in 8000h - BFFFh no mattter contents of port 7. This port does not map the entire page but only 64 bytes times the value in this port. It maps it starting from low memory (8000h) to high(BFFFh).

=== Read Values ===
* This port reads the last value written to it.

=== Write Values ===
* [00h - FFh]: The value times 64 equals the number of bytes that get re-mapped starting from 8000h. So a vaule of 18h would re-map data in 8000h - 85FFh.

== Comments ==
I can image this port having slighly more purpose than port 27, however it is still unusual.

Also I have left this Stubbed (like to 27) because more info is needed on this port, I haven't fully investigated it, but theres seems to be enough for generally use. Wikification is also needed because I believe the name and the description could be confusing.

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

← Older revision		Revision as of 16:30, 12 March 2013
Line 21:		Line 21:

	calc84maniac says: This port seems to have no effect whatsoever during memory map mode 1, but I may be wrong about that.		calc84maniac says: This port seems to have no effect whatsoever during memory map mode 1, but I may be wrong about that.
		+
		+	DrDnar says: I concur. It looks like ports 27 and 28 have no effect in memory mapping mode 1.

	== Credits and Contributions ==		== Credits and Contributions ==

@@ Line 1: / Line 1: @@
 [[Category:83Plus:Ports:By Address|28 - Block Memory Mapping 8000h]]
 [[Category:83Plus:Ports:By Name|Block Memory Mapping 8000h]]
-{{SE-Only Port|08}}
+{{SE-Only Port|00}}

@@ Line 1: / Line 1: @@
 [[Category:83Plus:Ports:By Address|28 - Block Memory Mapping 8000h]]
 [[Category:83Plus:Ports:By Name|Block Memory Mapping 8000h]]
-{{SE-Only Port|00}}
+{{SE-Only Port|08}}

← Older revision		Revision as of 06:34, 29 June 2011
Line 24:		Line 24:
	== Credits and Contributions ==		== Credits and Contributions ==
	* '''James Montelongo'''		* '''James Montelongo'''
		+
		+	== See Also ==
		+	* [[83Plus:Ports:27\|Port 27]]

@@ Line 19: / Line 19: @@
 == Comments ==
 I can image this port having slightly more purpose than port 27, however it is still unusual.
 == Credits and Contributions ==
 * '''James Montelongo'''

@@ Line 2: / Line 2: @@
 [[Category:83Plus:Ports:By Name|Block Memory Mapping 8000h]]
 {{SE-Only Port|00}}
-{{wikify}}
 == Synopsis ==
@@ Line 9: / Line 9: @@
 '''Function:''' Block Memory Mapping 8000h
-By an order of 64 bytes per block, this port can re-map data from ram page 1 to reflect the memory in 8000h - BFFFh no mattter contents of port 7. This port does not map the entire page but only 64 bytes times the value in this port. It maps it starting from low memory (8000h) to high(BFFFh).
+By an order of 64 bytes per block, this port can re-map data from RAM page 1 to the memory addresses 8000h - BFFFh without regard to the contents of port 7. This port does not map the entire page but only 64 bytes times the value in this port. It maps it starting from low memory (8000h) to high (BFFFh).
 === Read Values ===
@@ Line 19: / Line 19: @@
 == Comments ==
 I can image this port having slighly more purpose than port 27, however it is still unusual.
 == Credits and Contributions ==
 * '''James Montelongo'''