back references fixed

tsfm_speccy_player/!build.bat

@@ -1,5 +1,5 @@
 @echo off
 bas2tap -a10 -spsgplay loader.bas loader.tap
 sjasmplus main.asm --lst=main.lst
-copy /b loader.tap+player.tap "moebius.tap"
+copy /b loader.tap+player.tap+page0.tap+page1.tap+page3.tap+page4.tap+page6.tap+page7.tap "moebius.tap"
 pause

tsfm_speccy_player/loader.bas

@@ -1,3 +1,9 @@
 10  BORDER 0 : PAPER 7 : INK 7 : CLEAR 24575
 20  LOAD "moebius" CODE
+30  POKE 23388,16 : OUT 32765,16 : LOAD "page0" CODE
+40  POKE 23388,17 : OUT 32765,17 : LOAD "page1" CODE
+50  POKE 23388,19 : OUT 32765,19 : LOAD "page3" CODE
+60  POKE 23388,20 : OUT 32765,20 : LOAD "page4" CODE
+70  POKE 23388,22 : OUT 32765,22 : LOAD "page6" CODE
+80  POKE 23388,23 : OUT 32765,23 : LOAD "page7" CODE
 100 RANDOMIZE USR 33155

tsfm_speccy_player/main.asm

@@ -211,9 +211,23 @@ music_p0_ch15:
         page 4
         emptytap "page4.tap"
         org 0xC000
-
+        db  0
         savetap "page4.tap",CODE,"page4",0xC000,$-0xC000
 
+        ; ------------------------------------------------
+        page 6
+        emptytap "page6.tap"
+        org 0xC000
+        db  0
+        savetap "page6.tap",CODE,"page6",0xC000,$-0xC000
+
+        ; ------------------------------------------------
+        page 7
+        emptytap "page7.tap"
+        org 0xC000
+        db  0
+        savetap "page7.tap",CODE,"page7",0xC000,$-0xC000
+
         ; splash screen
         emptytap "splash.tap"
         org  0x4000

tsfm_speccy_player/player.asm

@@ -89,14 +89,11 @@ reg_out:
         ; ------------------------
         ; pop from stack
         ; in:  IX - channel context
-        ; trashes A, DE
+        ; trashes A, DE, HL
 pop_stack:
         dec     [ix + channel_struct_t.stack_pos]                   ; --chctx->stack_pos;
-        ld      l, [ix + channel_struct_t.stack_pos] : ld h, 0      ; hl = chctx->stack_pos;
-        add     hl, hl      ; *= 2
-        add     hl, hl      ; *= 4
-        ld      de, channel_struct_t.stack
-        add     hl, de
+        ld      a, [ix + channel_struct_t.stack_pos]
+        add     a : add  a : add channel_struct_t.stack : ld  l, a : ld  h, 0
         ld      de, ix
         add     hl, de      ; hl = st = chctx->stack + chctx->stack_pos;
 
@@ -115,11 +112,8 @@ pop_stack:
         ; in:  IX - channel context
         ; trashes A, DE
 push_stack:
-        ld      l, [ix + channel_struct_t.stack_pos] : ld h, 0      ; hl = chctx->stack_pos;
-        add     hl, hl      ; *= 2
-        add     hl, hl      ; *= 4
-        ld      de, channel_struct_t.stack
-        add     hl, de
+        ld      a, [ix + channel_struct_t.stack_pos]
+        add     a : add  a : add channel_struct_t.stack : ld  l, a : ld  h, 0
         ld      de, ix
         add     hl, de      ; hl = st = chctx->stack + chctx->stack_pos;
 
@@ -686,15 +680,16 @@ parse_stream:
 
         ; back reference, nested call :)
         ; int distance = ((*(data + 0) & 0x0F) << 8) | (*(data + 1));
+        push    hl
         ld      a, b : and  0x0F : ld  d, a : inc hl
         ldi     e, [hl]     ; de = distance
         ldi     a, [hl]     ; int frames_to_play = *(data + 2); data += 3
         ld      [ix + channel_struct_t.ptr], hl ; chctx->stream.ptr = data + 3;
 
-        push    af, de, hl
+        exa     : push  de
         call    push_stack
-        pop     hl, de, af
-        and     a : sbc  hl, de     ; data -= distance;
+        exa     : pop  de
+        pop     hl : and  a : sbc  hl, de     ; data -= distance;
 
         ; chctx->stream.frames_to_play = frames_to_play; // hack?
         ld      e, a : ld  d, 0 :  ld  [ix + channel_struct_t.frames_to_play], de
@@ -743,8 +738,7 @@ parse_stream:
         ret
 
 .not_pop:
-        exd
-        ld      [ix+channel_struct_t.ptr], de
+        ld      [ix+channel_struct_t.ptr], hl
         ret
 
         ; -----------------------------

tsfm_speccy_player/tsfm_1308_0451_optimized/tsfm_1308_0451_optimized_ch0.bin

@@ -1 +1 @@
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