Today I thought about general 8bit * 8bit multiplication routine... I'm propably 1000th person to do that or so, but I came up with this 223 clock version that needs 291 bytes of memory. Since I wrote it I may just as well share it although it might be a bit pointless.
It is not fastest and not smallest, but somewhere in between... At least it looks funny 
DB #FE ;BASIC Header
DW BEGIN,END-1,START
ORG #C000
BEGIN: ; 16*16 table
DB #00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00
DB #00,#01,#02,#03,#04,#05,#06,#07,#08,#09,#0A,#0B,#0C,#0D,#0E,#0F
DB #00,#02,#04,#06,#08,#0A,#0C,#0E,#10,#12,#14,#16,#18,#1A,#1C,#1E
DB #00,#03,#06,#09,#0C,#0F,#12,#15,#18,#1B,#1E,#21,#24,#27,#2A,#2D
DB #00,#04,#08,#0C,#10,#14,#18,#1C,#20,#24,#28,#2C,#30,#34,#38,#3C
DB #00,#05,#0A,#0F,#14,#19,#1E,#23,#28,#2D,#32,#37,#3C,#41,#46,#4B
DB #00,#06,#0C,#12,#18,#1E,#24,#2A,#30,#36,#3C,#42,#48,#4E,#54,#5A
DB #00,#07,#0E,#15,#1C,#23,#2A,#31,#38,#3F,#46,#4D,#54,#5B,#62,#69
DB #00,#08,#10,#18,#20,#28,#30,#38,#40,#48,#50,#58,#60,#68,#70,#78
DB #00,#09,#12,#1B,#24,#2D,#36,#3F,#48,#51,#5A,#63,#6C,#75,#7E,#87
DB #00,#0A,#14,#1E,#28,#32,#3C,#46,#50,#5A,#64,#6E,#78,#82,#8C,#96
DB #00,#0B,#16,#21,#2C,#37,#42,#4D,#58,#63,#6E,#79,#84,#8F,#9A,#A5
DB #00,#0C,#18,#24,#30,#3C,#48,#54,#60,#6C,#78,#84,#90,#9C,#A8,#B4
DB #00,#0D,#1A,#27,#34,#41,#4E,#5B,#68,#75,#82,#8F,#9C,#A9,#B6,#C3
DB #00,#0E,#1C,#2A,#38,#46,#54,#62,#70,#7E,#8C,#9A,#A8,#B6,#C4,#D2
DB #00,#0F,#1E,#2D,#3C,#4B,#5A,#69,#78,#87,#96,#A5,#B4,#C3,#D2,#E1
START:
LD HL,TEST
LD (#F39A),HL ;DEFUSR
RET
TEST:
LD HL,#F7F9 ;USR +1
LD A,(HL)
DEC L
MULT8:
; 8bit * 8bit multiplication: (HL)*A
; 16bit out: (HL)
; Changes: AF,DE,BC
LD D,BEGIN/256
RLD
LD C,(HL)
EX DE,HL
LD L,A
LD B,(HL)
LD L,C
LD C,(HL)
EX DE,HL
RLD
LD E,A
LD A,(DE)
LD E,(HL)
EX DE,HL
ADD A,(HL)
EX DE,HL
LD (HL),A
SBC A,A
AND 16
RLD
LD D,A
LD A,C
ADD A,(HL)
LD (HL),A
LD A,B
ADC A,D
INC HL
LD (HL),A
DEC HL
RET
END:
