From eb96a90e5fe642102b5b81dc1e031641ed362c29 Mon Sep 17 00:00:00 2001
From: mrdudz <mrdudz@users.noreply.github.com>
Date: Sun, 28 Feb 2016 22:35:46 +0100
Subject: [PATCH] initial import from old sources

---
 libsrc/c128/waitvblank.s   | 20 ++++++++++++++++++++
 libsrc/c64/waitvblank.s    | 20 ++++++++++++++++++++
 libsrc/cbm510/waitvblank.s | 37 +++++++++++++++++++++++++++++++++++++
 libsrc/vic20/waitvblank.s  | 16 ++++++++++++++++
 4 files changed, 93 insertions(+)
 create mode 100644 libsrc/c128/waitvblank.s
 create mode 100644 libsrc/c64/waitvblank.s
 create mode 100644 libsrc/cbm510/waitvblank.s
 create mode 100644 libsrc/vic20/waitvblank.s

diff --git a/libsrc/c128/waitvblank.s b/libsrc/c128/waitvblank.s
new file mode 100644
index 000000000..a3904d858
--- /dev/null
+++ b/libsrc/c128/waitvblank.s
@@ -0,0 +1,20 @@
+
+        .export         _waitvblank
+
+        .include        "c128/c128.inc"
+
+_waitvblank:
+        lda     PALFLAG
+        beq     @ntsc
+        ldx     #(312-24)-256
+        .byte $2c
+@ntsc:
+        ldx     #(262-4)-256
+@l1:
+        lda     VIC_CTRL1
+        and     #$80
+        beq     @l1
+@l2:
+        cpx     VIC_HLINE
+        bcs     @l2
+        rts
diff --git a/libsrc/c64/waitvblank.s b/libsrc/c64/waitvblank.s
new file mode 100644
index 000000000..09570f873
--- /dev/null
+++ b/libsrc/c64/waitvblank.s
@@ -0,0 +1,20 @@
+
+        .export         _waitvblank
+
+        .include        "c64/c64.inc"
+
+_waitvblank:
+        lda     PALFLAG
+        beq     @ntsc
+        ldx     #(312-24)-256
+        .byte $2c
+@ntsc:
+        ldx     #(262-4)-256
+@l1:
+        lda     VIC_CTRL1
+        and     #$80
+        beq     @l1
+@l2:
+        cpx     VIC_HLINE
+        bcs     @l2
+        rts
diff --git a/libsrc/cbm510/waitvblank.s b/libsrc/cbm510/waitvblank.s
new file mode 100644
index 000000000..30cbf072f
--- /dev/null
+++ b/libsrc/cbm510/waitvblank.s
@@ -0,0 +1,37 @@
+
+        .export         _waitvblank
+        .import         PALFLAG
+        .import         sys_bank, restore_bank
+
+        .importzp       vic
+
+        .include        "cbm510/cbm510.inc"
+
+_waitvblank:
+        rts     ; FIXME
+
+        jsr	sys_bank		; Switch to the system bank
+
+        lda PALFLAG
+        beq ntsc
+        ldx #(312-24)-256
+        .byte $2c
+ntsc:
+        ldx #(262-2)-256
+
+        sei
+        ldy #VIC_CTRL1
+l1:
+        lda (vic),y
+        and #$80
+        beq l1
+
+;?!?
+;		ldy #VIC_HLINE
+;		txa
+;l2:
+;		cmp (vic),y
+;		bcs l2
+
+        cli
+        jmp	restore_bank
diff --git a/libsrc/vic20/waitvblank.s b/libsrc/vic20/waitvblank.s
new file mode 100644
index 000000000..b99c74bed
--- /dev/null
+++ b/libsrc/vic20/waitvblank.s
@@ -0,0 +1,16 @@
+        .export         _waitvblank
+
+        .include        "vic20/vic20.inc"
+
+_waitvblank:
+        lda     PALFLAG
+        beq     @ntsc
+        ldx     #(312-8)/2
+        .byte $2c
+@ntsc:
+        ldx     #(262-8)/2
+@l2:
+        cpx     VIC_HLINE
+        bcs     @l2
+        rts
+
-- 
2.39.5