Change bootloader to actually use sectors per cluster

2023-10-25 08:34:28 -07:00
parent e7e1eab4a4
commit b6e3b79bda
2 changed files with 176 additions and 172 deletions
--- a/sw/bios/bootloader.s
+++ b/sw/bios/bootloader.s
@@ -118,10 +118,14 @@ _main:
        
        sec
        sbc #$02                ; don't handle carry, assume low byte is not 0 or 1
+        sta tmp1
        ldx data_start + 1      ; load x as high data start
-        asl                     ; multiply cluster num (minus 2) by 8
-        asl
-        asl
+        phx
+        ldx sectors_per_cluster ; multiply cluster num (minus 2) by sectors_per_cluster
+@4:     adc tmp1
+        dex
+        bne @4
+        plx
        clc
        adc data_start          ; add that to low data start
        bcc @3                  ; handle carry