enable IIc VBL

2024-05-31 16:41:34 +00:00 · 2019-10-24 14:03:17 -07:00 · 2019-10-24 14:03:17 -07:00 · 7aa9354d1f
commit 7aa9354d1f
parent 77bd03bbc8
1 changed files with 6 additions and 1 deletions
--- a/src/fx/hw.vbl.a
+++ b/src/fx/hw.vbl.a
@ -22,6 +22,9 @@ WaitForVBL
         +LDADDR WaitForVBL_iie
         bne   +
@iic
+         sta   $C07F      ; enable access to VBL register
+         sta   $C05B      ; enable VBL polling
+         sta   $C07E      ; disable access to VBL register
         +LDADDR WaitForVBL_iic
         bne   +
@nop
@ -50,5 +53,7 @@ WaitForVBL_iie            ; IIe/IIgs have a relatively sane VBL
         rts

 WaitForVBL_iic            ; IIc is special
-         ; TODO
+-        bit   $c019
+         bpl   -
+         bit   $c070      ;$c019 bit 7 is sticky, reset it
         rts