Initial import for public releaseHEADmain

1 files changed, 157 insertions, 0 deletions

diff --git a/loader.s b/loader.s
new file mode 100644
index 0000000..7ad31ae
--- /dev/null
+++ b/loader.s
@@ -0,0 +1,157 @@
+;
+; TAPE LOADER
+;
+
+.include "cpcfirm.inc"
+.include "loader.opt"
+
+loader:
+
+.ifeq DISK
+	; loading from disk
+
+	ld hl, (#0xbe7d)	; save current drive
+	ld a, (hl)
+	ld (#drive+1), a
+.endif ; end disk code
+
+	ld c, #0xff
+	ld hl, #start
+	call mc_start_program
+
+start:
+	call kl_rom_walk
+
+.ifeq DISK
+drive:
+	ld a, #0		; restore drive
+	ld hl, (#0xbe7d)
+	ld (hl), a
+.endif ; end disk code
+
+	ld bc, #0		; set border
+	call scr_set_border
+
+	ld bc, #0		; bg color
+	xor a
+	call scr_set_ink
+
+	ld a, #1			; set mode 1
+	call scr_set_mode
+
+	ld a, #0xff
+	call cas_noisy ; disable tape texts
+
+.ifeq DISK
+					; first file is the SCRX
+	call load_file
+
+.else ; tape code
+
+	ld ix, #TMP_ADDR
+	ld de, #SCRX_SIZE
+	call turboload
+
+.endif ; end tape code
+
+					; setup the palette
+	ld b, #0x10
+	xor a
+	ld ix, #TMP_ADDR + #4
+set_palette_loop:
+	push bc
+	push af
+	ld c, (ix)
+	inc ix
+	ld b, c
+	call scr_set_ink
+	pop af
+	pop bc
+	inc a
+	djnz set_palette_loop
+
+	; border is already 0
+
+	ld hl, #0xc000	; uncompress into the screen
+	push hl
+	ld hl, #TMP_ADDR + #0x14 ; compressed data
+	push hl
+	call _ucl_uncompress
+	pop af
+	pop af
+
+.ifeq DISK
+
+	ld hl, #fname_end-#1
+	inc (hl)
+					; load the code
+	call load_file
+
+.else ; tape code
+
+	ld ix, #APP_ADDR
+	ld de, #APP_SIZE
+	call turboload
+
+.endif ; tape code ends
+
+	xor	a		; set mode 0
+	call scr_set_mode
+
+	; jp to the app entry point
+	.db #0xc3
+	.dw #APP_EP
+
+.ifeq DISK
+
+load_file:
+	ld hl, #fname
+	ld b, #fname_end-#fname
+
+	ld de, #0x400		; temp mem (only used in tape mode)
+	call cas_in_open
+
+	push de
+	pop hl
+	call cas_in_direct
+
+	call cas_in_close
+	ret
+
+fname:
+	.str "MAIN.BI0"
+fname_end:
+
+.else ; tape code
+
+turboload:
+	di
+	ex af, af'
+	push af
+	ex af, af'
+	exx
+	push de
+	push bc
+	push hl
+	exx
+	xor a
+	ld r, a
+	dec a
+	call _turboload
+	jp nc, 0
+	exx
+	pop hl
+	pop bc
+	pop de
+	exx
+	ex af, af'
+	pop af
+	ex af, af'
+	ei
+	ret
+
+.include "turboload.s"
+.endif ; end tape code
+
+.area _DATA
+