From be048d3184d451c76cf56dd706be8d087c477d77 Mon Sep 17 00:00:00 2001
From: "B. Watson" <urchlay@slackware.uk>
Date: Tue, 14 Apr 2026 06:45:36 -0400
Subject: The Great Migration: move all the screen memory to the $4000-$7FFF
 bank window, move code to $8000, move data/rodata/bss to $2000, move rx_buf
 and tx_buf, etc etc.

---
 font_dl.asm | 30 +++++++++++++++++-------------
 1 file changed, 17 insertions(+), 13 deletions(-)

(limited to 'font_dl.asm')

diff --git a/font_dl.asm b/font_dl.asm
index a48699a..f89e682 100644
--- a/font_dl.asm
+++ b/font_dl.asm
@@ -1,8 +1,17 @@
 
- *= $8000
+ *= $3400
  .incbin "font.dat"
 
-; screen RAM starts right after the font.
+; shoehorn the transmit & receive buffers here
+ *= $3800
+rx_buf ; 512 bytes
+ *= $3a00
+tx_buf ; 512 bytes
+ *= $3c00
+scr_vis_buf ; not used yet
+
+ *= $4000
+; screen RAM starts at the XE bankswitching window!
 ; 7 double-height screens, 50 lines each.
 scr0_top
  *= * + 1000
@@ -10,10 +19,10 @@ scr1_top
  *= * + 1000
 scr2_top
  *= * + 1000
-edbox_only_dlist = *
+edbox_only_dlist
 
 ; can't cross a 4K boundary...
- *= $9000
+ *= $5000
 scr3_top
  *= * + 1000
 scr4_top
@@ -22,13 +31,7 @@ scr5_top
  *= * + 1000
 scr6_top
 
-; shoehorn the transmit & receive buffers here
- *= $a000
-rx_buf ; 512 bytes
- *= $a200
-tx_buf ; 512 bytes
- *= $a400
-
+ *= $6000
 scr0_bot
  *= * + 1000
 scr1_bot
@@ -36,7 +39,7 @@ scr1_bot
 scr2_bot
  *= * + 1000
 
- *= $b000
+ *= $7000
 scr3_bot
  *= * + 1000
 scr4_bot
@@ -77,6 +80,7 @@ dl_status_lms
  .byte $06           ; one GR.1 line
  .byte $41           ; JVB
  .word dlist_bot
+topbot_dlist_done
 
  *= edbox_only_dlist
  .byte $70, $70, $30 ; 2 8-line blanks, 1 4-line blank
@@ -90,4 +94,4 @@ dl_status_lms
  .byte $06   ; GR.1
  .byte $41
  .word edbox_only_dlist
-
+edbox_dlist_done
-- 
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