work towards literal output for native MEGA65 mode

src/basic/basic_commands/cmd_go_goto_run.s

@@ -50,7 +50,16 @@ cmd_go_syntax_error:
 	jsr helper_ask_if_sure
 	bcs cmd_go_rts
 	jsr M65_MODE65
-	jmp do_clr
+	// XXX test code, replace by jmp do_clr
+
+	jsr do_clr
+
+	lda #$41
+	jsr JCHROUT
+testx:
+	jmp testx
+
+
 !:
 	jmp do_ILLEGAL_QUANTITY_error
 
@@ -82,6 +91,8 @@ cmd_run:
 cmd_goto:
 
 	// GOTO requires line number
+	// XXX in case of no parameter, go to line 0 - checked with original ROMs
+
 
 	jsr fetch_line_number
 #if !ROM_LAYOUT_M65

src/kernal/screen_m65/mega65_chrout_screen.s

@@ -32,9 +32,65 @@ m65_chrout_screen_literal: // entry point for m65_chrout_screen_quote
 
 	tax                                // store screen code, we need .A for calculations
 
-	// XXX continue the implementation
+	// Preserve .Z on stack, use it toi store screen columnt
 
+	phz
+	ldz M65__TXTCOL
 
+	// Start from setting M65_SCRSEG to point colour memory (starts from $FF80000)
 
+	lda #$0F
+	sta M65_SCRSEG+3
+	lda #$F8
+	sta M65_SCRSEG+2
+
+	lda M65_COLVIEW+1
+	sta M65_SCRSEG+1
+	lda M65_COLVIEW+0
+	sta M65_SCRSEG+0
+
+	// Add screen row to the address
+
+	ldy M65__TXTROW
+	clc
+	lda m65_scrtab_rowoffset_lo,y
+	adc M65_SCRSEG+0
+	sta M65_SCRSEG+0	
+	lda m65_scrtab_rowoffset_hi,y
+	adc M65_SCRSEG+1
+	sta M65_SCRSEG+1	
+
+	// Store the new color in screen memory
+
+	lda COLOR
+	sta_lp (M65_LPNT_SCR),z
+
+	// Now change M65_LPNT_SCRb to point to screen memory
+
+	// XXX deduplicate this part
+	lda M65_SCRSEG+1
+	sta M65_LPNT_SCR+3
+	lda M65_SCRSEG+0
+	sta M65_LPNT_SCR+2
+
+	clc
+	lda M65_SCRBASE+0
+	adc M65_LPNT_SCR+0
+	sta M65_LPNT_SCR+0
+	lda M65_SCRBASE+1
+	adc M65_LPNT_SCR+1
+	sta M65_LPNT_SCR+1
+
+	// Store the new character in screen memory, restore .Z
+
+	txa
+	sta_lp (M65_LPNT_SCR),z
+	plz
+
+	// Increment screen column by 1
+
+	inc M65__TXTCOL
+
+	// XXX continue the implementation - fix the cursor position
 
 	rts

src/kernal/screen_m65/mega65_clrscr.s

@@ -23,7 +23,7 @@ m65_clrscr_takeover:
 	// - M65_SCRVIEW, M65_COLVIEW
 	// To clear the screen, two zeropage long pointers will be used, initialize them too
 	// - M65_LPNT_SCR  for screen memory
-	// - M65_LPNT_KERN for colour memory (starts from $FF80000)
+	// - M65_LPNT_KERN for colour memory (starts from $FF80000) // XXX preserve this on stack, restore afterwards
 
 	sta M65_COLVIEW+0
 	sta M65_COLVIEW+1

src/kernal/screen_m65/mega65_clrwin.s

@@ -18,7 +18,7 @@ M65_CLRWIN:
 
 	// To clear the window, two zeropage long pointers will be used:
 	// - M65_LPNT_SCR  for screen memory
-	// - M65_LPNT_KERN for colour memory (starts from $FF80000)
+	// - M65_LPNT_KERN for colour memory (starts from $FF80000) // XXX preserve this on stack, restore afterwards
 
 	// First initialize both pointers