X-Git-Url: http://cloudbase.mooo.com/gitweb/z180-stamp.git/blobdiff_plain/215ec4b2e6066ba845bfb4d3c95c7b01cd4492ce..98aac4d093d6eafff084fbfb49bd4a6e2c62bfe8:/z180/config.inc

diff --git a/z180/config.inc b/z180/config.inc
index ffab6e6..d10b113 100644
--- a/z180/config.inc
+++ b/z180/config.inc
@@ -46,24 +46,36 @@ PRT_PRE		equ	20		;PRT prescaler
 ;-----------------------------------------------------
 ; MMU
 
-COMMON_SIZE	equ	16*1024		;Common Area size in bytes
+COMMON_SIZE	equ	4*1024		;Common Area size in bytes
 					;must be multiple of 4K
-
 if (COMMON_SIZE mod 1000h)
 	.printx COMMON_SIZE not multiple of 4K!
 	end	;stop assembly
 endif
+CMN_SIZE	equ	COMMON_SIZE/1000h		;4K units
+BNK_SIZE	equ	64/4 - CMN_SIZE			;bank size (4K units)
+BANKS		equ	(512/4 - CMN_SIZE)/BNK_SIZE	;max nr. of banks
+
+; Logical address space, CBAR values
 
-CSK	equ	COMMON_SIZE/1000h	;
-CA	equ	10h - CSK		;common area start
-BA	equ	0			;banked area start
+CA		equ	10h - CMN_SIZE		;common area start (64K - common size)
+BA		equ	0			;banked area start
+
+   if 0
 
 SYS$CBR		equ	0
 SYS$CBAR	equ	CA*16 + CA	;CBAR in system mode
 USR$CBAR	equ	CA*16 + BA	;CBAR in user mode (CP/M)
 
+   endif
+   if 1
+
+SYS$CBR		equ	BNK_SIZE
+SYS$CBAR	equ	CA*16 + CA	;CBAR in system mode
+USR$CBAR	equ	CA*16 + BA	;CBAR in user mode (CP/M)
+
+   endif
 
-BANKS		equ	18		;max nr. of banks
 
 ;-----------------------------------------------------