Issue z88dk#2432: Add mapping for pc88 since it only has 8 colours

Author: suborb

libsrc/target/pc88/pc88.lst

@@ -12,6 +12,7 @@ target/pc88/pc88_cursoron
 target/pc88/pc88_locate
 target/pc88/pc88_crtset
 target/pc88/pc88_wait_vblank
+target/pc88/stdio/conio_map_colour
 target/pc88/stdio/fgetc_cons
 target/pc88/stdio/getk
 target/pc88/stdio/fputc_cons

libsrc/target/pc88/stdio/conio_map_colour.asm

@@ -0,0 +1,43 @@
+; Platform specific colour transformation
+;
+; Entry: a = colour
+; Exit:  a = colour to use on screen
+; Used:  hl,bc,f
+;
+
+    MODULE  code_clib
+    PUBLIC  conio_map_colour
+
+    EXTERN  __CLIB_CONIO_NATIVE_COLOUR
+
+conio_map_colour:
+    ld      c,__CLIB_CONIO_NATIVE_COLOUR
+    rr      c
+    ret     c
+    and     15
+    ld      c,a
+    ld      b,0
+    ld      hl,table
+    add     hl,bc
+    ld      a,(hl)
+    ret
+
+	SECTION	rodata_clib
+table:
+    defb    $0	;BLACK -> BLACK
+    defb    $1	;BLUE -> BLUE
+    defb    $4	;GREEN -> GREEN
+    defb    $5	;CYAN -> CYAN
+    defb    $2	;RED -> RED
+    defb    $3	;MAGENTA -> MAGENTA
+    defb    $2	;BROWN -> RED
+    defb    $7	;LIGHTGRAY -> WHITE
+    defb    $7	;DARKGRAY -> WHITE
+    defb    $1	;LIGHTBLUE -> BLUE
+    defb    $4	;LIGHTGREEN -> GREEN
+    defb    $5	;LIGHTCYAN -> CYAN
+    defb    $2	;LIGHTRED -> RED
+    defb    $3	;LIGHTMAGENTA -> MAGENTA
+    defb    $6	;YELLOW -> YELLOW
+    defb    $7	;WHITE -> WHITE
+

libsrc/target/pc88/stdio/generic_console.asm

@@ -30,6 +30,7 @@
 	EXTERN		generic_console_flags
 	EXTERN		__console_x
 	EXTERN		__CLIB_PC8800_V2_ENABLED
+        EXTERN         conio_map_colour
 
 	INCLUDE	"target/pc88/def/pc88.def"
 
@@ -38,11 +39,13 @@
 
 
 generic_console_set_paper:
+        call    conio_map_colour
 	and	7
 	ld	(__pc88_paper),a
 	ret
 
 generic_console_set_ink:
+        call    conio_map_colour
 	and	7
 	ld	(__pc88_ink),a
 	rrca