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Used an easier-to-remember way of creating a program that uses graphics RAM for other purposes.

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Greg King 2014-12-13 09:52:39 -05:00
parent 8d5bb55281
commit d9df576fa6
2 changed files with 18 additions and 9 deletions
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6
cfg/atmos.cfg
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@ -2,10 +2,10 @@ SYMBOLS {
__TAPEHDR__: type = import; __TAPEHDR__: type = import;
__BASHDR__: type = import; __BASHDR__: type = import;
__PROGFLAG__: type = weak, value = $00; # $00=BASIC, $80=machine code __PROGFLAG__: type = weak, value = $00; # $00=BASIC, $80=machine code
__AUTORUN__: type = weak, value = $00; # $C7=run, $00=only load __AUTORUN__: type = weak, value = $00; # $00=only load, $C7=run
__STACKSIZE__: type = weak, value = $0800; # 2K stack __STACKSIZE__: type = weak, value = $0800; # 2K stack
__RAMEND__: type = weak, value = $9800; # graphics RAM not grabbed __GRAB__: type = weak, value = 0; # 0=don't grab graphics RAM, 1=grab graphics RAM
# __RAMEND__: type = weak, value = $B400; # graphics RAM grabbed __RAMEND__: type = weak, value = $9800 + $1C00 * __GRAB__;
} }
MEMORY { MEMORY {
ZP: file = "", define = yes, start = $00E2, size = $001A; ZP: file = "", define = yes, start = $00E2, size = $001A;

21
doc/atmos.sgml
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@ -7,7 +7,7 @@
<url url="mailto:uz@cc65.org" name="Ullrich von Bassewitz">,<newline> <url url="mailto:uz@cc65.org" name="Ullrich von Bassewitz">,<newline>
<url url="mailto:polluks@sdf.lonestar.org" name="Stefan A. Haubenthal">,<newline> <url url="mailto:polluks@sdf.lonestar.org" name="Stefan A. Haubenthal">,<newline>
<url url="mailto:greg.king5@verizon.net" name="Greg King"> <url url="mailto:greg.king5@verizon.net" name="Greg King">
<date>2014-12-03 <date>2014-12-05
<abstract> <abstract>
An overview over the Atmos runtime system as it is implemented for the cc65 C An overview over the Atmos runtime system as it is implemented for the cc65 C
@ -50,9 +50,9 @@ In the standard setup, cc65-generated programs use the memory from
available. ROM calls are possible without further precautions. available. ROM calls are possible without further precautions.
If your program needs more memory, and it won't use TGI graphics, then you can If your program needs more memory, and it won't use TGI graphics, then you can
use the ld65 command-line option, <tt/-D __RAMEND__=$B400/, when building the use the ld65 command-line option, <tt/-D __GRAB__=1/, when building the
program, to "grab" the graphics screen RAM. Then, nearly 44K of memory is program, to include the graphics screen RAM. Then, nearly 44K of memory
available. (&dollar;0501 to &dollar;B400) is available.
Special locations: Special locations:
@ -100,7 +100,7 @@ structures; accessing the struct fields will access the chip registers.
<descrip> <descrip>
<tag><tt/VIA/</tag> <tag><tt/VIA/</tag>
Access to the VIA (versatile interface adapter) chip is available via the Access to the VIA (Versatile Interface Adapter) chip is available via the
<tt/VIA/ variable. The structure behind this variable is explained in <tt/_6522.h/. <tt/VIA/ variable. The structure behind this variable is explained in <tt/_6522.h/.
</descrip><p> </descrip><p>
@ -217,7 +217,7 @@ following functions (and a few others):
They are defined to be FUNCT + a number key. They are defined to be FUNCT + a number key.
<sect1>Capitals Lock<p> <sect1>Capitals lock<p>
The keyboard's "CAPS Lock" mode is turned off while the program is running. The keyboard's "CAPS Lock" mode is turned off while the program is running.
The previous mode (usually, CAPS Lock turned on [because Oric BASIC keywords The previous mode (usually, CAPS Lock turned on [because Oric BASIC keywords
@ -246,6 +246,15 @@ supported directly by BASIC, the following syntax was chosen:
</enum> </enum>
<sect1>Automatic starting<p>
Usually, a cc65-built program just will sit quietly in memory, after it is
CLOADed. It waits for you to start it (by typing BASIC's <tt/RUN/ command).
But, if you want to create a program that will start running immediately after
it is loaded, then you can use the linker command-line option
<tt/-D __AUTORUN__=$C7/.
<sect1>Interrupts<p> <sect1>Interrupts<p>
The runtime for the Atmos uses routines marked as <tt/.INTERRUPTOR/ for The runtime for the Atmos uses routines marked as <tt/.INTERRUPTOR/ for