This page (revision-4) was last changed on 03-Feb-2023 15:21 by Carsten Strotmann 

This page was created on 14-Mar-2010 13:52 by Carsten Strotmann

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Version Date Modified Size Author Changes ... Change note
4 03-Feb-2023 15:21 50 KB Carsten Strotmann to previous
3 14-Mar-2010 13:58 50 KB Carsten Strotmann to previous | to last
2 14-Mar-2010 13:57 50 KB Carsten Strotmann to previous | to last
1 14-Mar-2010 13:52 50 KB Carsten Strotmann to last

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Sweet 16
Sweet 16

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Difference between version and

At line 5 changed 3 lines
* [original Apple 2 ROM Source|Sweet16Apple2]
* [Atari 8bit port for BiboAssembler|Sweet16Bibo]
* [Atari 8bit port for Mac65|Sweet16Mac65]
* ~[original Apple 2 ROM Source|Sweet16Apple2]
* ~[Atari 8bit port for BiboAssembler|Sweet16Bibo]
* ~[Atari 8bit port for Mac65|Sweet16Mac65]
At line 66 changed one line
Implemented in only 300 bytes of code, SWEET16 has a very simple instruction set tailored to operations such as memory moves and stack manipulation. Most opcodes are only one byte long, but since she runs approximately ten times slower than equivalent 6502 code, SWEET16 should be employed only when code is at a premium or execution is not. As an example of her usefulness, I have estimated that about 1K byte could be weeded out of my 5K byte Apple-II BASIC interpreter with no observable performance degradation by selectively applying SWEET16. []
Implemented in only 300 bytes of code, SWEET16 has a very simple instruction set tailored to operations such as memory moves and stack manipulation. Most opcodes are only one byte long, but since she runs approximately ten times slower than equivalent 6502 code, SWEET16 should be employed only when code is at a premium or execution is not. As an example of her usefulness, I have estimated that about 1K byte could be weeded out of my 5K byte Apple-II BASIC interpreter with no observable performance degradation by selectively applying SWEET16. ~[]
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Sweet 16 is probably the least used and least understood seed in the Apple \]\[.
Sweet 16 is probably the least used and least understood seed in the Apple ]~~[.
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SWEET 16 is ROM based in every Apple \]\[ from $F689 to $F7FC. It has it's own set of opcodes and instruction sets, and uses the SAVE and RESTORE routines from the Apple Monitor to preserve the 6502 registers when in use, allowing SWEET 16 to be used as a subroutine.
SWEET 16 is ROM based in every Apple ]~~[ from $F689 to $F7FC. It has it's own set of opcodes and instruction sets, and uses the SAVE and RESTORE routines from the Apple Monitor to preserve the 6502 registers when in use, allowing SWEET 16 to be used as a subroutine.
At line 230 changed one line
SWEET 16 as a language - or tool - opens a new direction to Apple \]\[ owners without spending a dime, and it's been there all the time.
SWEET 16 as a language - or tool - opens a new direction to Apple ]~[ owners without spending a dime, and it's been there all the time.
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10 PRINT "[D]BLOAD SWEET": REM CTRL D
10 PRINT "~[D]BLOAD SWEET": REM CTRL D
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SET Rn,Constant \[ 1n Low High \]
SET Rn,Constant ~[ 1n Low High ]
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LD Rn \[ 2n \]
LD Rn ~[ 2n ]
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ST Rn \[ 3n \]
ST Rn ~[ 3n ]
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LD @Rn \[ 4n \]
LD @Rn ~[ 4n ]
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ST @Rn \[ 5n \]
ST @Rn ~[ 5n ]
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LDD @Rn \[ 6n \]
LDD @Rn ~[ 6n ]
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STD @Rn \[ 7n \]
STD @Rn ~[ 7n ]
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POP @Rn \[ 8n \]
POP @Rn ~[ 8n]
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STP @Rn \[ 9n \]
STP @Rn ~[ 9n ]
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ADD Rn \[ An \]
ADD Rn ~[ An ]
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SUB Rn \[ Bn \]
SUB Rn ~[ Bn ]
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POPD @Rn \[ Cn \]
POPD @Rn ~[ Cn ]
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CPR Rn \[ Dn \]
CPR Rn ~[ Dn ]
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INR Rn \[ En \]
INR Rn ~[ En ]
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DCR Rn \[ Fn \]
DCR Rn ~[ Fn ]
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BR ea \[ 01 d \]
BR ea ~[ 01 d ]
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the APPLE \\]\\[ monitor may be used to calculate displacements.
the APPLE \\]\\~[ monitor may be used to calculate displacements.
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BNC ea \[ 02 d \]
BNC ea ~[ 02 d ]
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BC ea \[ 03 d \]
BC ea ~[ 03 d ]
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BP ea \[ 04 d \]
BP ea ~[ 04 d ]
At line 742 changed one line
BM ea \[ 05 d \]
BM ea ~[ 05 d ]
At line 750 changed one line
BZ ea \[ 06 d \]
BZ ea ~[ 06 d ]
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BNZ ea \[ 07 d \]
BNZ ea ~[ 07 d ]
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BM1 ea \[ 08 d \]
BM1 ea ~[ 08 d ]
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BNM1 ea \[ 09 d \]
BNM1 ea ~[ 09 d ]
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BK \[ 0A \]
BK ~[ 0A ]
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RS \[ 0B \]
RS ~[ 0B ]
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BS ea \[ 0c d \]
BS ea ~[ 0c d ]
This page (revision-4) was last changed on 03-Feb-2023 15:21 by Carsten Strotmann  Top