From de3b61ffda30f7c725008786ecb5a4764670082e Mon Sep 17 00:00:00 2001
From: John Tsiombikas <nuclear@member.fsf.org>
Date: Thu, 27 Feb 2020 10:51:18 +0200
Subject: [PATCH] almost there

---
 dos1/c.asm |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/dos1/c.asm b/dos1/c.asm
index fb0214f..78a0946 100644
--- a/dos1/c.asm
+++ b/dos1/c.asm
@@ -1,4 +1,4 @@
-; Lowest yet: 270
+; Lowest yet: 265
 
 	bits 16
 %ifdef BOOTSECT
@@ -12,6 +12,7 @@ SHADOW_OFFS equ 5
 
 SIERP_PT equ code_end
 RANDVAL equ code_end + 4
+SIERP_VERTS equ code_end + 8
 
 
 %macro WAIT_VBLANK 0
@@ -147,12 +148,12 @@ animate:
 	mov di, sierp_verts
 	mov si, sierp_vel
 .loop:
-	mov ebx, 2
+	mov bx, 4
 .xyloop:
 	mov ax, [di]		; grab vertex X
 	add ax, [si]		; add velocity X
 	jl .xout
-	cmp ax, [ebx * 2 + bounds - 2]
+	cmp ax, [bx + bounds - 2]
 	jge .xout
 	jmp .skip_xflip
 .xout:
@@ -164,7 +165,7 @@ animate:
 	; to do the same for Y increment edi and esi by 2
 	add di, 2
 	add si, 2
-	dec bx
+	sub bx, 2
 	jnz .xyloop
 
 	dec cx
-- 
1.7.10.4