Browse Source
Merge pull request #647 from b3rendsh/master
Update loader for MSX
pull/652/head
v3.6.0-dev.51
Wayne Warthen
3 weeks ago
committed by
GitHub
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with
20 additions and
1 deletions
-
Source/MSX/msx-ldr.asm
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@ -17,11 +17,21 @@ P2_SEG .equ $f2c9 ; current segment page 2 (MSX-DOS 2) |
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CSRSW .equ $fca9 ; cursor on/off flag |
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MNROM .equ $fcc1 ; main system rom slot |
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H_TIMI .equ $fd9f ; timer interrupt hook (vdp vsync) |
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HB_IDENT .equ $fffc ; pointer to HBIOS ident data block |
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; ------------------------------------------------------------------------------ |
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.ORG $100 |
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jp main |
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.db 13,10 |
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.db "MSX ROMWBW LOADER V0.2",13,10 |
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.db 26 |
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main: call check_ident ; running from RomWBW? |
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jp z,0 ; z=yes,silently end program |
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; copy loader to page 3 and run it there |
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ld hl,LSTART |
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ld de,$c000 |
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@ -29,6 +39,16 @@ H_TIMI .equ $fd9f ; timer interrupt hook (vdp vsync) |
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ldir |
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jp $c000 |
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; Check for RomWBW HBIOS |
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check_ident: ld hl,(HB_IDENT) |
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ld a,'W' |
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cp (hl) |
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ret nz |
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inc hl |
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ld a,~'W' |
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cp (hl) |
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ret |
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LSTART: |
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; ------------------------------------------------------------------------------ |
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@ -225,7 +245,6 @@ _restore2: ld a,$01 |
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ld a,b |
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ret |
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; --------------------------------------------------------- |
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; Handle errors reading rom file |
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; --------------------------------------------------------- |
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