PPI Signal	PPIDE		PPISD		DSKY		DSKYNG (PROTO)	DSKYNG (FINAL)
----------	-----		-----		-----		-----		-----
PA0		<>D0				>ID0		<>D0		<>D0
PA1		<>D1                            >ID1		<>D1		<>D1
PA2		<>D2                            >ID2		<>D2		<>D2
PA3		<>D3                            >ID3		<>D3		<>D3
PA4		<>D4                            >ID4 /SHUTDOWN	<>D4		<>D4
PA5		<>D5                            >ID5 /DECODE	<>D5		<>D5
PA6		<>D6                            >ID6 HEXA/CODEB	<>D6		<>D6
PA7		<>D7                            >ID7 DAT_COMING	<>D7		<>D7

PB0		<>D8				+<ROW5                          
PB1             <>D9				+<ROW4                          
PB2             <>D10				+<ROW3                          
PB3             <>D11				+<ROW2                          
PB4             <>D12                           +<ROW1                          
PB5             <>D13                           +<ROW0                          
PB6             <>D14				+                               
PB7             <>D15		<MISO		+                               

PC0		>DA0		>MOSI		>COL0		>A0		>A0
PC1		>DA1		>CLK		>COL1           		>/WR                
PC2		>DA2				>COL2           		>/RD                
PC3		>CS0*				>COL3		>CS&*		>CS&*
PC4		>CS1*		>/CS				>CS&*		>CS&*
PC5		>DIOW*						>/WR
PC6		>DIOR*				>/WR		>/RD
PC7		>RESET*				>MODE		>RESET		>RESET

* Inverted by adapter
+ Pullup
& Both signals must be asserted

Compatibility:

- PPISD & DSKY
- PPIDE & DSKYNG
- PPISD & DSKYNG