Difference between revisions of "83Plus:Ports:0D"

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(Just realized the original example code was laughable.)
 
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'''Note:''' Do not take the information on this template page as actual documentation!
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[[Category:83Plus:Ports:By_Address|0D - Link Assist Output Buffer]] [[Category:83Plus:Ports:By_Name|Link Assist Output Buffer]]
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The Ports are named by their number, in hexadecimal. An example is [[83Plus:Ports:00]].
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You also must put a variation on the following code into your page to have it categorized:
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NaodW29-nowiki605b15f223c35f2d00000001
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----
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== Synopsis ==
 
== Synopsis ==
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'''Port Number:''' 06h
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'''Port Number:''' 0Dh
  
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'''Function:''' Flash Memory Paging
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'''Function:''' Link Assist Output Buffer
  
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This port controls what page is swapped into the 4000h to 7FFFh range. ('''DO NOT''' take this template page as real documentation on port 6!)
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This port allows you to write data to be sent by the link assist.
  
 
=== Read Values ===
 
=== Read Values ===
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* [00h - FFh]: The current port mapped to the memory range 4000h through 7FFFh.
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''None''
  
 
=== Write Values ===
 
=== Write Values ===
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* [00h - FFh]: The new page to swap in to the memory range 4000h through 7FFFh
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* [00h - FFh]: The byte to be written
  
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''Note: if you would have bitwise flags for your port, label them "bit X".''
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== Comments ==
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This port only exists on the 83+ SE and the 84+.
  
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== Comments ==
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Check [[83Plus:Ports:09|port 9]] before you write this port, to be sure that the assist is ready.
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The behavior of this port changes in different memory map modes.
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== Example ==
 
== Example ==
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  NaodW29-nowiki605b15f223c35f2d00000002
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  SendByteSE:
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ld b,a
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WaitToSend:
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in a,[[83Plus:Ports:04|(4)]]
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and 8
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jr z,LinkError
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in a,[[83Plus:Ports:09|(9)]]
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bit 5,a
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jr nz,SendByteSE_OK
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bit 6,a
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jr z,WaitToSend
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LinkError:
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scf
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ret
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SendByteSE_OK:
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ld a,b
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out (0Dh),a
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or a
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ret
  
 
== Credits and Contributions ==
 
== Credits and Contributions ==
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* '''/dev/urandom:''' Because of your randomness, this project is possible.
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* '''Michael Vincent:''' Original documentation of the link assist

Latest revision as of 01:25, 31 March 2006

Synopsis

Port Number: 0Dh

Function: Link Assist Output Buffer

This port allows you to write data to be sent by the link assist.

Read Values

None

Write Values

  • [00h - FFh]: The byte to be written

Comments

This port only exists on the 83+ SE and the 84+.

Check port 9 before you write this port, to be sure that the assist is ready.

Example

SendByteSE:
	ld b,a 
WaitToSend:
	in a,(4)
	and 8
	jr z,LinkError
	in a,(9)
	bit 5,a
	jr nz,SendByteSE_OK
	bit 6,a
	jr z,WaitToSend
LinkError:
	scf
	ret
SendByteSE_OK:
	ld a,b
	out (0Dh),a
	or a
	ret

Credits and Contributions

  • Michael Vincent: Original documentation of the link assist
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