flashing bars

diff --git a/bootcard.asm b/bootcard.asm
index 4a2f3e4..016d7a9 100644 (file)
--- a/bootcard.asm
+++ b/bootcard.asm
@@ -6,10 +6,16 @@
        org 7c00h
        bits 16
 
+barh   equ 4
+nbars  equ 11
+barstart equ 200 - (nbars+1) * barh
+
 nticks equ 7e00h
 tmoffs equ 7e04h
 musptr equ 7e08h
-ppos   equ 7e0ch
+frame  equ 7e0ch
+fval   equ 7e10h
+cmap   equ 7e14h
 
 %macro setcur 2
        mov dx, %1 | (%2 << 8)
@@ -56,12 +62,20 @@ start:      xor ax, ax
        push 0a000h
        pop es
 
-       setcur 10, 0
+       
+       mov al, 16
+       mov di, barstart * 320
+       mov bx, nbars
+.drawbars:
+       mov cx, barh * 320
+       rep stosb
+       inc al
+       dec bx
+       jnz .drawbars
+
+       setcur 12, 16
        mov si, str1
        call textout
-       setcur 12, 1
-       mov si, str2
-       call textout
 
        sti
 
@@ -74,15 +88,9 @@ mainloop:
        and al, 8
        jz .novb
 
-       call drawbg
-
-       call psys
-
-       jmp mainloop
-
 drawbg:
        mov bx, 200
-       mov di, 5120
+       xor di, di
 .fillgrad:
        mov ax, bx
        mov ah, al
@@ -104,42 +112,23 @@ drawbg:
        fistp word [bp - 2]
        fstp st0
        mov bx, [bp - 2]
-       add bx, 100
+       add bx, 84
        imul bx, bx, 320
        add bx, cx
 .mntcol:
        mov byte [es:bx], 0
        add bx, 320
-       cmp bx, 64000
+       cmp bx, 128 * 320
        jb .mntcol
 
        dec cx
        jnz .mnt
-       
-       ret
 
-psys:  cmp word [ppos + 2], 0
-       ja .skipspawn
-
-       call rnd
-       add ax, 128
-       mov [ppos + 2], ax
-       call rnd
-       add ax, 32
-       mov [ppos], ax
-.skipspawn:
-       dec word [ppos + 2]
-       mov ax, [ppos + 2]
-       shr ax, 2
-       imul bx, ax, 320
-       add bx, [ppos]
-       mov byte [es:bx], 0eh
-
-rnd:   in al, 40h
-       mov ah, al
-       in al, 40h
-       shr ax, 8
-       ret
+       test word [nticks], 0fh
+       jnz mainloop
+       call fadecol
+
+       jmp mainloop
 
 textout:
        mov al, [si]
@@ -152,6 +141,34 @@ textout:
        jmp textout
 .done: ret
 
+fadecol:
+       push es
+       push word 0
+       pop es
+       mov ax, 16
+       mov dx, 3c7h
+       out dx, al
+       add dx, 2
+       mov cx, 16 * 3
+       mov di, cmap
+       rep insb
+       pop es
+       dec dx
+       out dx, al
+       inc dx
+       mov cx, 16 * 3
+       mov si, cmap
+.fadeloop:
+       lodsb
+       test al, al
+       jz .skipdec
+       dec al
+.skipdec:
+       out dx, al
+       dec cx
+       jnz .fadeloop
+       ret
+
 tintr:
        pusha
        mov ax, [nticks]
@@ -177,6 +194,18 @@ tintr:
        test ax, ax
        jz .off
        mov bx, ax
+
+       mov dx, 3c8h
+       shr ax, 9
+       add ax, 3
+       out dx, al
+       inc dx
+       mov al, 3fh
+       out dx, al
+       mov al, 2fh
+       out dx, al
+       out dx, al
+
        stimer 2, bx
        spkon
        jmp .eoi
@@ -188,8 +217,7 @@ tintr:
        popa
        iret
 
-str1:  db 'message blah',0
-str2:  db 'Michael & Athena',0
+str1:  db 'Michael ',3,' Athena',0
 
 music: dd 0a2f8f00h, 0a11123a1h, 23a11423h, 28000023h, 0be322f8fh, 25c0391fh
        dd 4b23a13ch, 8f500000h, 23a15a2fh, 641ab161h, 476e1ab1h, 1fbe751ch