Initial upload, Echo 0.8 UNSTABLE VERSION

1 files changed, 70 insertions, 0 deletions

diff --git a/src-z80/core/vars.z80 b/src-z80/core/vars.z80
new file mode 100644
index 0000000..ef9a676
--- /dev/null
+++ b/src-z80/core/vars.z80
@@ -0,0 +1,70 @@
+;****************************************************************************
+; Player variables
+;****************************************************************************
+
+    ds $100-($&$FF), $FF
+RAM_PSGData:        ds 4*16         ; PSG envelope data
+                                      ; ds 1 ... Channel volume
+                                      ; ds 1 ... Global volume
+                                      ; ds 3 ... Current address
+                                      ; ds 3 ... Looping address
+                                      ; ds 3 ... Start address
+                                      ; ds 1 ... Padding
+                                      ; ds 3 ... BGM instrument address
+                                      ; ds 1 ... BGM channel volume
+
+RAM_BGMFMInstr:     ds 8            ; FM instruments used by BGM
+RAM_BGMFMVol:       ds 8            ; FM volumes used by BGM
+RAM_FMVolume:       ds 8            ; Volume of each FM channel
+RAM_FMData:         ds 8*5          ; FM info (for volume handling)
+                                      ; ds 8*1 ... Register $B0
+                                      ; ds 8*1 ... Register $40
+                                      ; ds 8*1 ... Register $44
+                                      ; ds 8*1 ... Register $48
+                                      ; ds 8*1 ... Register $4C
+
+RAM_LastBank:       ds 1            ; Last accessed bank
+
+RAM_BGMData:                        ; Where BGM data starts
+RAM_BGMPlaying:     ds 1              ; Set if a BGM is playing
+RAM_BGMDelay:       ds 1              ; How many ticks to wait
+RAM_BGMBank:        ds 1              ; Current BGM bank
+RAM_BGMAddress:     ds 2              ; Current BGM address
+RAM_BGMLoopPoint:   ds 3              ; BGM loop point
+
+RAM_SFXData:                        ; Where SFX data starts
+RAM_SFXPlaying:     ds 1              ; Set if a SFX is playing
+RAM_SFXDelay:       ds 1              ; How many ticks to wait
+RAM_SFXBank:        ds 1              ; Current SFX bank
+RAM_SFXAddress:     ds 2              ; Current SFX address
+
+RAM_Locked:         ds 12           ; Locked channels
+
+RAM_Scratch:        ds 32           ; Scratch bytes, may be useful when
+                                      ; buffering to speed up to avoid bank
+                                      ; switching conflicts
+
+;****************************************************************************
+; Pointer list starts being stored from here
+; $300 (768) bytes are needed to store the pointer list
+;
+; Format for a pointer list entry is as follows:
+;   RAM_PointerList[$000+n] = address high
+;   RAM_PointerList[$100+n] = address low
+;   RAM_PointerList[$200+n] = bank
+;****************************************************************************
+
+    ds $100-($&$FF), $FF
+
+RAM_PointerList: equ $1C00
+
+;****************************************************************************
+; 68000 communication variables
+;****************************************************************************
+
+RAM_Stack:          equ $1FF0       ; Where stack starts
+
+RAM_Status:         equ $1FF0       ; Current playback status
+RAM_Command:        equ $1FFF       ; Command type
+RAM_ComAddr:        equ $1FFD       ; Command address parameter
+RAM_ComBank:        equ $1FFC       ; Command bank parameter