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changeset 3260:4e52ba817ecb

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cowprs: Add register descriptions from PBJ WORD-PAK manual These are the registers on the SY6845 CRT controller.
author Tormod Volden <debian.tormod@gmail.com>
date Wed, 29 Aug 2018 09:05:32 +0200
parents c8f04a82ac30
children beea40fcb852
files level1/modules/cowprs.asm
diffstat 1 files changed, 22 insertions(+), 22 deletions(-) [+]
line wrap: on
line diff
--- a/level1/modules/cowprs.asm	Wed Aug 29 09:05:17 2018 +0200
+++ b/level1/modules/cowprs.asm	Wed Aug 29 09:05:32 2018 +0200
@@ -36,28 +36,28 @@
 name     fcs   /CoWP/
          fcb   edition
 
-* WordPak Initialization Values
-WPIV     fcb   $6F		R0
-         fcb   $50		R1
-         fcb   $57		R2
-         fcb   $3C 		R3
-         fcb   $1C 		R4
-         fcb   $0A 		R5
-         fcb   $19 		R6
-         fcb   $1A 		R7
-         fcb   $78		R8
-         fcb   $09 		R9
-L0034    fcb   $60 		R10
-         fcb   $09 		R11
-         fcb   $00 		R12
-         fcb   $00 		R13
-         fcb   $00 		R14
-         fcb   $00 		R15
-         fcb   $00 		R16
-         fcb   $00 		R17
-         fcb   $00 		R18
-         fcb   $00 		R19
-         fcb   $10 		R20
+* WordPak Initialization Values (6845 registers)
+WPIV     fcb   $6F	R0    Horizontal Total
+         fcb   $50	R1    Horizontal Displayed
+         fcb   $57	R2    Horizontal Sync Position
+         fcb   $3C 	R3    Horz/Vert Sync Widths
+         fcb   $1C 	R4    Vertical Total
+         fcb   $0A 	R5    Vertical Total Adjust
+         fcb   $19 	R6    Vertical Displayed
+         fcb   $1A 	R7    Vertical Sync Position
+         fcb   $78	R8    Mode Control
+         fcb   $09 	R9    Scan Lines/Row
+L0034    fcb   $60 	R10   Cursor Start/Blink Rate
+         fcb   $09 	R11   Cursor End Scan Line
+         fcb   $00 	R12   Display Start (MSB)
+         fcb   $00 	R13   Display End (LSB)
+         fcb   $00 	R14   Cursor Position (MSB)
+         fcb   $00 	R15   Cursor Position (LSB)
+         fcb   $00 	R16   Light Pen Position (MSB)
+         fcb   $00 	R17   Light Pen Position (LSB)
+         fcb   $00 	R18   Update Address (MSB)
+         fcb   $00 	R19   Update Address (LSB)
+         fcb   $10 	R20
 
 start    equ   *
          lbra  Init