even more startup tweaks

c64/kernal/init/cint_real.s

@@ -56,18 +56,16 @@ cint_pal:
 !:
 	sta TVSFLG
 
-	// Setup KEYLOG vector - XXX is it proper place?
+cint_brk: // entry for BRK and STOP+RESTORE - XXX, where should it start?
+
+	// Setup KEYLOG vector
 
 	lda #<scnkey_set_keytab
 	sta KEYLOG+0
 	lda #>scnkey_set_keytab
 	sta KEYLOG+1
 
-cint_brk: // entry for BRK and STOP+RESTORE - XXX, where should it start?
+	// Initialise cursor blink flags (Compute's Mapping the 64 p215)
-
-	jsr setup_vicii
-
-	// Initialise cursor blink flags  (Compute's Mapping the 64 p215)
 
 	lda #$01
 	sta BLNCT
@@ -94,15 +92,18 @@ cint_brk: // entry for BRK and STOP+RESTORE - XXX, where should it start?
 	bpl !-
 	sta BufferQuantity
 
-#endif
-
 	// Set key repeat delay (Compute's Mapping the 64 p215)
 	// Making some numbers up here: Repeat every ~1/10th sec
 	// But require key to be held for ~1/3sec before
 	// repeating (Compute's Mapping the 64 p58)
+
+	// Not needed for default keyboard scanning code
+
 	ldx #22-2 		// Fudge factor to match speed
 	stx DELAY
 	
+#endif
+
 	// Set current colour for text (Compute's Mapping the 64 p215)
 	ldx #$01     // default is light blue ($0E), but we use a different one
 	stx COLOR
@@ -115,5 +116,9 @@ cint_brk: // entry for BRK and STOP+RESTORE - XXX, where should it start?
 	ldx #$00
 	stx MODE
 
+	// Setup video and I/O
+	jsr setup_vicii
+
 	// Fallthrough/jump to screen clear routine (Compute's Mapping the 64 p215)
+
 	jmp clear_screen

c64/kernal/init/e5a0.setup_vicii.s

@@ -8,8 +8,6 @@
 
 setup_vicii:
 
-	// XXX it should also set default devices
-
 	// Clear everything - turn off sprites (observed hanging around after
  	// running programs and resetting), etc.
 

c64/kernal/init/fce2.hw_entry_reset.s

@@ -5,12 +5,18 @@
 hw_entry_reset:
 
 	// The GPL program at https://github.com/Klaus2m5/6502_65C02_functional_tests/blob/master/6502_functional_test.a65
-	// uses the following initial reset sequence, affirmed by c64 PRG p269
+	// uses the similar initial reset sequence, affirmed by c64 PRG p269
 
-	cld // for CPUs might clear D flag - but it is possible this is called manually
+	sei // disable the interrupts, as fast as possible - they are disabled in case of HW reset,
-	ldx #$FF
+	    // but this routine can be also called manually
+
+	ldx #$00
+	sta VIC_SCROLX // turn the display off - we want as little screen artifacts as possible
+
+	cld // required for all CPUs - due to possibility of manual call
+
+	dex // $FF - to initialize stack pointer
 	txs
-	sei
 
 	// The following routine is based on reading the public KERNAL jumptable routine
 	// list, and making unimaginative assumptions about what should be done on reset.

c64/kernal/init/fda3.ioinit.s

@@ -13,7 +13,7 @@ IOINIT:
 	// Set $00/$01 port mode and value
 	// We want BASIC and KERNAL ROMs mapped, and datasette motor off
 	// (https://www.c64-wiki.com/wiki/Zeropage)
-	// XXX - Work around VICE bug: Writing $00 before $01 results in rubbish in $01
+	// Work around for VICE bug: Writing $00 before $01 results in rubbish in $01
 	// after. https://sourceforge.net/p/vice-emu/bugs/1057/
 	lda #$27
 	ldx #$2F

c64/kernal/interrupts/fe66.default_brk_handler.s

@@ -5,6 +5,11 @@ default_brk_handler:
 
 	sei // disable IRQs, to be sure they won't interfere
 
+	ldx #$00
+	sta VIC_SCROLX // turn the display off - we want as little screen artifacts as possible
+
+	cld // make sure this dangerous flag is disabled
+
 	jsr JRESTOR
 	jsr JIOINIT
 	jsr cint_brk

c64/kernal/iostack/findfls.s

@@ -1,5 +1,5 @@
 
-// Just a helper routines
+// Just a helper routine
 
 // Find the LAT / SAT / FAT entry index where LAT corresponds to A, returns index in Y
 // Carry flag set means not found