vaporlock: update the iie code

vaporlock/iie/Makefile

@@ -7,12 +7,12 @@ EMPTYDISK = ../../empty_disk/empty.dsk
 
 all:	split.dsk
 
-split.dsk:	HELLO SPLIT NOTWORK DOUBLE
+split.dsk:	HELLO SPLIT NOVBLANK DOUBLE
 	cp $(EMPTYDISK) split.dsk
 	$(DOS33) -y split.dsk SAVE A HELLO
 	$(DOS33) -y split.dsk BSAVE -a 0x384 SPLIT
 	$(DOS33) -y split.dsk BSAVE -a 0x1000 DOUBLE
-	$(DOS33) -y split.dsk BSAVE -a 0x384 NOTWORK
+	$(DOS33) -y split.dsk BSAVE -a 0x384 NOVBLANK
 
 ###
 
@@ -37,14 +37,14 @@ split.o:	split.s
 
 ###
 
-NOTWORK:	notwork.o
-	ld65 -o NOTWORK notwork.o -C $(LINKERSCRIPTS)/apple2_384.inc
+NOVBLANK:	novblank.o
+	ld65 -o NOVBLANK novblank.o -C $(LINKERSCRIPTS)/apple2_384.inc
 
-notwork.o:	notwork.s
-	ca65 -o notwork.o notwork.s -l notwork.lst
+novblank.o:	novblank.s
+	ca65 -o novblank.o novblank.s -l novblank.lst
 
 
 ###
 
 clean:	
-	rm -f *~ *.o *.lst HELLO SPLIT NOTWORK
+	rm -f *~ *.o *.lst HELLO SPLIT NOVBLANK

vaporlock/iie/README

@@ -1,3 +1,15 @@
-was trying some vaporlock for the AppleIIbot
-but forgot the emulator used there (linapple?)
-doesn't implement the VBLANK register, or mid-screen mode switching
+Some experiments with mid-screen mode switching on the Apple IIe.
+
+Was initially trying some vaporlock for the AppleIIbot but forgot the
+emulator used there (linapple?) doesn't implement the VBLANK register,
+or mid-screen mode switching.
+
+Further work in this directory is looking at more advanced switching
+of the double modes (80-column, double-lores, double-hires) as well as
+messing with the AN3 setting.
+
+
+SPLIT -- tiny apple IIe mode switch code
+NOVBLANK -- apple IIe mode switch that doesn't wait for VBLANK
+DOUBLE -- test of mid-screen switch of double modes
+

vaporlock/iie/novblank.s

@@ -1,6 +1,7 @@
-; split screen?
+; mid-screen changes but not waiting for VBLANK
 
-; apple ii bot $C019 doesn't work, so skip it and hope for best
+; on apple ii twitter bot emulator $C019 for detecting VBLANK doesn't work
+; so was seeing if still could modeswitch anyway (answer: no)
 
 ; by Vince `deater` Weaver
 

vaporlock/iie/split.s

@@ -1,4 +1,6 @@
-; split screen?
+; testing mid-screen mode switching in a small number of bytes on Apple IIe
+; originally intended for AppleII Twitter bot, but its emulator didn't
+;	support mid-screen mode switching
 
 ; by Vince `deater` Weaver