merge latest changes from sizif-512

* add 4.4 MHz and 5.2 MHz turbo modes
* handle magic key press if initialization wasn't completed before
* replace 'timings', 'ram', 'plus3' settings with one 'machine' setting
* refactor memory controller
* significantly improve classic timings
* magic rom: fix 'h' font character
* fix hanging of esxdos browser after magic key double press
* enable divmmc (esxdos OS) by magic rom on poweron; add NO-OS option
* improve pause ('f12' on ps/2 keyboard or 'start' on gamepad)
* magic rom: handle C-key on sega gamepad as exit

rom/Makefile

@@ -1,12 +1,23 @@
-all:
-	cat 128-0.rom \
-		128-1.rom \
-		../rom_src/main.bin \
-		ESXMMC.BIN ESXMMC.BIN \
-		dvmen3e0.rom \
-		dvmen3e1.rom \
-		dvmen3e2.rom \
-		opense.rom \
-		>sizif.bin
-	objcopy --input-target=binary --output-target=ihex sizif.bin sizif.hex
-	rm sizif.bin
+# Each bank = 16Kb
+bank00=128-0.rom              # 0x00000
+bank01=128-1.rom              # 0x04000
+bank02=../rom_src/main.bin    # 0x08000
+bank03=ESXMMC.BIN ESXMMC.BIN  # 0x0C000
+bank04=dvmen3e0.rom           # 0x10000
+bank05=dvmen3e1.rom           # 0x14000
+bank06=dvmen3e2.rom           # 0x18000
+bank07=zero8k.bin zero8k.bin  # 0x1C000
+
+sizif.rom: ${bank00} ${bank01} ${bank02} ${bank03} ${bank04} ${bank05} ${bank06} ${bank07}
+
+%.rom:
+	cat $+ > $@
+
+%.hex: %.rom
+	objcopy --input-target=binary --output-target=ihex $< $@
+
+.DEFAULT_GOAL := all
+all: sizif.hex
+
+clean:
+	rm -f sizif.rom sizif.hex