the10thwiz/cc65
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Added a 160x192x2 TGI (graphics) driver to the VIC-20 library.

Browse Source 
The driver requires a special linker configuration: "vic20-tgi.cfg".
The VIC-20 computer needs at least 8K of expansion RAM!

"tgidemo.c" needed to be adjusted because the VIC-20's vertical (y) range is greater than its horizontal (x) range -- the opposite of most other platforms.  Also, the circle demo would jam on the VIC-20.
This commit is contained in:
Greg King
2020-07-08 05:55:30 -04:00
parent d1833cc441
commit 410e4502ee
11 changed files with 1253 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

50
cfg/vic20-tgi.cfg Normal file
View File

@@ -0,0 +1,50 @@
# Memory configuration which supports the "vic20-hi.tgi" driver.
# Memory configuration for a VIC-20 with, at least, 8K expansion RAM.
FEATURES {
STARTADDRESS: default = $1201;
}
SYMBOLS {
__LOADADDR__: type = import;
__EXEHDR__: type = import;
__TGIHDR__: type = import;
__STACKSIZE__: type = weak, value = $0200; # 512-byte stack
__HIMEM__: type = weak, value = $4000;
}
MEMORY {
ZP: file = "", define = yes, start = $0002, size = $001A;
LOADADDR: file = %O, start = %S - 2, size = $0002;
HEADER: file = %O, define = yes, start = %S, size = $003E;
MAIN: file = %O, define = yes, start = $2000, size = __HIMEM__ - __MAIN_START__ - __STACKSIZE__;
}
SEGMENTS {
ZEROPAGE: load = ZP, type = zp;
LOADADDR: load = LOADADDR, type = ro;
# The start-up code needs EXEHDR, TGI1HDR, TGI2HDR,
# and STARTUP to be next to each other, in that order.
EXEHDR: load = HEADER, type = ro;
TGI1HDR: load = HEADER, type = ro;
TGI2HDR: load = MAIN, type = ro;
STARTUP: load = MAIN, type = ro;
LOWCODE: load = MAIN, type = ro, optional = yes;
CODE: load = MAIN, type = ro;
RODATA: load = MAIN, type = ro;
DATA: load = MAIN, type = rw;
ONCE: load = MAIN, type = ro, optional = yes, define = yes;
INIT: load = MAIN, type = bss, optional = yes;
BSS: load = MAIN, type = bss, define = yes;
}
FEATURES {
CONDES: type = constructor,
label = __CONSTRUCTOR_TABLE__,
count = __CONSTRUCTOR_COUNT__,
segment = ONCE;
CONDES: type = destructor,
label = __DESTRUCTOR_TABLE__,
count = __DESTRUCTOR_COUNT__,
segment = RODATA;
CONDES: type = interruptor,
label = __INTERRUPTOR_TABLE__,
count = __INTERRUPTOR_COUNT__,
segment = RODATA,
import = __CALLIRQ__;
}