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:date: 2023.11.19 05:26:35
:modified: 2024.02.23 17:55:19
:tags: 6809,HW,OMENkilo,SW
:authors: Gilhad
:summary: 6809
:title: 6809
:nice_title: |logo| %title% |logo|

%HEADER%

6809
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External clock
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`XTAL` (39) and `EXTAL` (`38`) slouží pro připojení krystalu, alternativně na `EXTAL 38` mohou být připojeny externí `TTL hodiny`, XTAL se pak nechá nezapojený (plovoucí)

Missing instructions
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* `ABA` ADD acumulator B to acumulator A
	* 
		
		.. code::
		
			PSHS B
			ADDA ,S+
		
	* wer twtre
* wer
	* something else

Optimalizace 6309
-------------------------------------------------------------------------------

* AIM - AND with Immediate
	.. code::
	
		7/4	AIM	#~$40,V_ACIA_CTRL_byte
		4/3	LDA	V_ACIA_CTRL_byte
		11/7 (nebo 7/4)
		
		vs.
		4/3	LDA	V_ACIA_CTRL_byte
		2/2	ANDA	#~$40
		4/3	STA	V_ACIA_CTRL_byte
		10/8

Odkazy jinam
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* `6809 Assembler <https://lennartb.home.xs4all.nl/m6809.html>`__ -> `sbc09 <https://github.com/6809/sbc09.git>`__
* `SiMon6809 Educational Computer 2007/12/02 <http://www.8bitforce.com/projects/simon6809/>`__
* `RetroShield 6809 for Arduino 2650 mega <http://www.8bitforce.com/blog/2019/03/12/retroshield-6809-operation/>`__
* 
* `Martin Malý <https://maly.cz/>`__: `osmibity <https://www.osmibity.cz/>`__, `Porty, byty ... <https://www.osmibity.cz/ebook/Porty__bajty_osmibity_interaktivni.pdf>`__,

* `make: Auto Vars <http://cobra-mk3.gilhad.cz/AsketicAligator/hints/make-automatic-variables.html>`__ 
* `asm6809 <https://www.6809.org.uk/git/asm6809.git>`__
* `OMEN: kilo <https://github.com/omenmicro/kilo>`__


Odkazy sem
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* `6809-6809E_Reference_Card.pdf <6809-6809E_Reference_Card.pdf>`__
* `asm6809.html <asm6809.html>`__
* `colors: asm63.vim <asm63.vim>`__

Push order for 6809 stack:
--------------------------------------------------------------------------------

(Made with DrawIt VIM plugin)

.. code::

	
	                  New S                                 Old S
	                  |                                     |
	                  |                                     |
	$0000             v                                     v                 $FFFF
	+--+-     -+--+--+--+--+--+--+--+--+--+--+--+--+---+---+--+--+--+--+-     -+--+
	|..|.......|..|..|CC| A| B|DP|Xh|Xl|Yh|Yl|Uh|Ul|PCh|PCl|##|##|##|..|.......|..|
	+--+-     -+--+--+--+--+--+--+--+--+--+--+--+--+---+---+--+--+--+--+-     -+--+
	                                         |Sh|Sl|
	                                         +--+--+ for PSHU ... 
	    
	    PUSH / PULL order
	
	         +-----+-----------------------------+
	         | CC  | Condition Code Register     |      .
	    |    +-----+-----------------------------+     /_\
	    |    | A   | A Accumulator               |      |
	    |    +-----+-----------------------------+      |
	         | B   | B Accumulator               |      |
	    P    +-----+-----------------------------+       
	    U    | DP  | Direct Page Register        |      P
	    L    +-----+-----------------------------+      U
	    L    | X   | X Index Register            |      S
	         +-----+-----------------------------+      H
	    |    | Y   | Y Index Register            |       
	    |    +-----+-----------------------------+      |
	   _|_   | S/U | Hardware/User Stack Pointer |      |
	   \ /   +-----+-----------------------------+      |
	    '    | PC  | Program Counter             |
	         +-----+-----------------------------+