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Added SWEET 16 mode

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git-svn-id: svn://svn.cc65.org/cc65/trunk@3209 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz 2004-10-03 21:38:49 +00:00
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doc/ca65.sgml
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@ -132,10 +132,10 @@ Here is a description of all the command line options:
Set the default for the CPU type. The option takes a parameter, which Set the default for the CPU type. The option takes a parameter, which
may be one of may be one of
6502, 65SC02, 65C02, 65816 and sunplus 6502, 65SC02, 65C02, 65816, sunplus, sweet16
The last one (sunplus) is not available in the freeware version, because the The sunplus cpu is not available in the freeware version, because the
instruction set of the sunplus CPU is "proprietary and confidential". instruction set is "proprietary and confidential".
<label id="option--feature"> <label id="option--feature">
@ -371,6 +371,35 @@ from the mentioned web page, for more information, see there.
<sect1>sweet16 mode<label id="sweet16-mode"><p>
SWEET 16 is an interpreter for a pseudo 16 bit CPU written by Steve Wozniak
for the Apple ][ machines. It is available in the Apple ][ ROM. ca65 can
generate code for this pseudo CPU when switched into sweet16 mode. The
following is special in sweet16 mode:
<itemize>
<item>The '@' character denotes indirect addressing and is no longer available
for cheap local labels. If you need cheap local labels, you will have to
switch to another lead character using the <tt/<ref id=".LOCALCHAR"
name=".LOCALCHAR">/ command.
<item>Registers are specified using <tt/R0/ .. <tt/R15/. In sweet16 mode,
these identifiers are reserved words.
</itemize>
Please note that the assembler does neither supply the interpreter needed for
SWEET 16 code, nor the zero page locations needed for the SWEET 16 registers,
nor does it call the interpreter. All this must be done by your program. Apple
][ programmers do probably know how to use sweet16 mode.
For more information about SWEET 16, see
<htmlurl url="http://www.6502.org/source/interpreters/sweet16.htm"
name="http://www.6502.org/source/interpreters/sweet16.htm">.
<sect1>Number format<p> <sect1>Number format<p>
For literal values, the assembler accepts the widely used number formats: For literal values, the assembler accepts the widely used number formats: