doslib probe DOS, CPU, and VGA. exit politely if not VGA.

[16.git] / src / bakapi.c

diff --git a/src/bakapi.c b/src/bakapi.c
index 28faa99d7c53c9663811565cf58873b06fd7e277..9a5412c752b1935703a8f8008d0be51e51e08e6f 100755 (executable)
--- a/src/bakapi.c
+++ b/src/bakapi.c
@@ -33,6 +33,27 @@ int ch=0x0;
 void
 main(int argc, char *argvar[])
 {
+       // DOSLIB: check our environment
+       probe_dos();
+
+       // DOSLIB: what CPU are we using?
+       // NTS: I can see from the makefile Sparky4 intends this to run on 8088 by the -0 switch in CFLAGS.
+       //      So this code by itself shouldn't care too much what CPU it's running on. Except that other
+       //      parts of this project (DOSLIB itself) rely on CPU detection to know what is appropriate for
+       //      the CPU to carry out tasks. --J.C.
+       cpu_probe();
+
+       // DOSLIB: check for VGA
+       if (!probe_vga()) {
+               printf("VGA probe failed\n");
+               return;
+       }
+       // hardware must be VGA or higher!
+       if (!(vga_state.vga_flags & VGA_IS_VGA)) {
+               printf("This program requires VGA or higher graphics hardware\n");
+               return;
+       }
+
        // main variables values
        d=4; // switch variable
        key=2; // default screensaver number
@@ -44,11 +65,6 @@ main(int argc, char *argvar[])
 #ifdef MXLIB
        VGAmodeX(1, &gvar);
 #else
-               probe_dos();
-       if (!probe_vga()) {
-               printf("VGA probe failed\n");
-               return 1;
-       }
        int10_setmode(19);
        update_state_from_vga();
        vga_enable_256color_modex(); // VGA mode X