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updated docs

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mrdudz 2015-10-18 23:57:58 +02:00
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commit 5099910b18
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doc/c64.sgml
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@ -116,6 +116,30 @@ cl65 -o file.prg -u __EXEHDR__ -t c64 -C c64-asm.cfg source.s
Please note that in this case a changed start address doesn't make sense,
since the program must be loaded to the BASIC start address.
<sect>Extras<p>
<sect1>80 Columns conio driver<p>
The C64 package comes with an alternative software driven 80 columns
module <tt/c64-soft80.o/ which uses the memory under I/O between &dollar;d000
and &dollar;ffff.
In memory constrained situations the memory from &dollar;400 to &dollar;7FF
can be made available to a program by calling <tt/_heapadd ((void *) 0x400, 0x400);/
at the beginning of <tt/main()/. Doing so is beneficial even if the program
doesn't use the the heap explicitly because loading a driver (and in fact
already opening a driver file) uses the heap implicitly.
Using <tt/c64-soft80.o/ is as simple as placing it on the linker command
line like this:
<tscreen><verb>
cl65 -t c64 myprog.c c64-soft80.o
</verb></tscreen>
Note that the soft80 conio driver is incompatible with the
<tt/c64-ram.emd (c64_ram_emd)/ extended memory driver and the
<tt/c64-hi.tgi (c64_hi_tgi)/ graphics driver.
<sect>Platform-specific header files<p>
@ -216,6 +240,9 @@ configuration.
palette of the 16 C64 colors).
</descrip><p>
Note that the graphics drivers are incompatible with the
<tt/c64-ram.emd (c64_ram_emd)/ extended memory driver and the
<tt/c64-soft80.o/ software 80 columns conio driver.
<sect1>Extended memory drivers<p>
@ -241,7 +268,7 @@ configuration.
<tag><tt/c64-ram.emd (c64_ram_emd)/</tag>
A driver for the hidden RAM below the I/O area and kernal ROM. Supports 48
256 byte pages. Please note that this driver is incompatible with any of the
graphics drivers!
graphics drivers, or the soft80 conio driver!
<tag><tt/c64-ramcart.emd (c64_ramcart_emd)/</tag>
A driver for the RamCart 64/128 written and contributed by Maciej Witkowiak.