Split bios in multiple asm files

2020-10-27 20:08:07 +01:00
parent 20abf66411
commit 5d881511dc
3 changed files with 53 additions and 40 deletions
--- a/assembly/bios/main.asm
+++ b/assembly/bios/main.asm
@@ -0,0 +1,46 @@
+; Pat80 BIOS v0.01
+; @author: Daniele Verducci
+; 
+; ROM is at 0x00
+; RAM is at 0x80
+; LCD is at I/O 0x00 and 0x01
+
+
+
+jp sysinit     ; Startup vector: DO NOT MOVE! Must be the first instruction
+
+
+; SYSTEM CONFIGURATION
+LCD_INSTR_REG: EQU %00000000
+LCD_DATA_REG: EQU %00000001
+
+
+; CONSTANTS
+SYSINIT_GREETING:
+    DB "Pat80 BIOS v0.1",0  ; null terminated string
+LIPSUM:
+    DB "Lorem ipsum dolor sit amet, consectetur adipiscing elit.",0
+
+
+
+
+
+include 'driver_hd44780.asm'
+
+; System initialization
+sysinit:
+    call lcd_init
+
+    ; write characters to display
+    ld bc, SYSINIT_GREETING
+    call lcd_print      ; write string to screen
+
+    ld bc, LIPSUM
+    call lcd_print
+
+    ;call lcd_cls        ; clear screen
+
+    halt
+
+
+