Program Organisation
This should be written with HEXLD3D (chapter11-hexld3d.p)
which has its machine code located between 4A82 and 4B77
(RAMTOP should be set to 4A00).
Program Listing
Don't be put off by this table; it's only 256 bytes
but I've shown the individual bits to track errors.
You only need type-in the hex bytes down the left.
; After -- DD ED FD
4B78: 40 LENS DEFB 01-00-00-00 00
C0 DEFB 11-00-00-00 01
40 DEFB 01-00-00-00 02
40 DEFB 01-00-00-00 03
40 DEFB 01-00-00-00 04
40 DEFB 01-00-00-00 05
80 DEFB 10-00-00-00 06
40 DEFB 01-00-00-00 07
40 DEFB 01-00-00-00 08
51 DEFB 01-01-00-01 09
40 DEFB 01-00-00-00 0A
40 DEFB 01-00-00-00 0B
40 DEFB 01-00-00-00 0C
40 DEFB 01-00-00-00 0D
80 DEFB 10-00-00-00 0E
40 DEFB 01-00-00-00 0F
4B88: 80 DEFB 10-00-00-00 10
C0 DEFB 11-00-00-00 11
40 DEFB 01-00-00-00 12
40 DEFB 01-00-00-00 13
40 DEFB 01-00-00-00 14
40 DEFB 01-00-00-00 15
80 DEFB 10-00-00-00 16
40 DEFB 01-00-00-00 17
80 DEFB 10-00-00-00 18
51 DEFB 01-01-00-01 19
40 DEFB 01-00-00-00 1A
40 DEFB 01-00-00-00 1B
40 DEFB 01-00-00-00 1C
40 DEFB 01-00-00-00 1D
80 DEFB 10-00-00-00 1E
40 DEFB 01-00-00-00 1F
4B98: 80 DEFB 10-00-00-00 20
F3 DEFB 11-11-00-11 21
F3 DEFB 11-11-00-11 22
51 DEFB 01-01-00-01 23
40 DEFB 01-00-00-00 24
40 DEFB 01-00-00-00 25
80 DEFB 10-00-00-00 26
40 DEFB 01-00-00-00 27
80 DEFB 10-00-00-00 28
51 DEFB 01-01-00-01 29
F3 DEFB 11-11-00-11 2A
51 DEFB 01-01-00-01 2B
40 DEFB 01-00-00-00 2C
40 DEFB 01-00-00-00 2D
80 DEFB 10-00-00-00 2E
40 DEFB 01-00-00-00 2F
4BA8: 80 DEFB 10-00-00-00 30
C0 DEFB 11-00-00-00 31
C0 DEFB 11-00-00-00 32
40 DEFB 01-00-00-00 33
62 DEFB 01-10-00-10 34
62 DEFB 01-10-00-10 35
B3 DEFB 10-11-00-11 36
40 DEFB 01-00-00-00 37
80 DEFB 10-00-00-00 38
51 DEFB 01-01-00-01 39
C0 DEFB 11-00-00-00 3A
40 DEFB 01-00-00-00 3B
40 DEFB 01-00-00-00 3C
40 DEFB 01-00-00-00 3D
80 DEFB 10-00-00-00 3E
40 DEFB 01-00-00-00 3F
4BB8: 44 DEFB 01-00-01-00 40
44 DEFB 01-00-01-00 41
44 DEFB 01-00-01-00 42
4C DEFB 01-00-11-00 43
44 DEFB 01-00-01-00 44
44 DEFB 01-00-01-00 45
66 DEFB 01-10-01-10 46
44 DEFB 01-00-01-00 47
44 DEFB 01-00-01-00 48
44 DEFB 01-00-01-00 49
44 DEFB 01-00-01-00 4A
4C DEFB 01-00-11-00 4B
40 DEFB 01-00-00-00 4C
44 DEFB 01-00-01-00 4D
62 DEFB 01-10-00-10 4E
44 DEFB 01-00-01-00 4F
4BC8: 44 DEFB 01-00-01-00 50
44 DEFB 01-00-01-00 51
44 DEFB 01-00-01-00 52
4C DEFB 01-00-11-00 53
40 DEFB 01-00-00-00 54
40 DEFB 01-00-00-00 55
66 DEFB 01-10-01-10 56
44 DEFB 01-00-01-00 57
44 DEFB 01-00-01-00 58
44 DEFB 01-00-01-00 59
44 DEFB 01-00-01-00 5A
4C DEFB 01-00-11-00 5B
40 DEFB 01-00-00-00 5C
40 DEFB 01-00-00-00 5D
66 DEFB 01-10-01-10 5E
44 DEFB 01-00-01-00 5F
4BD8: 44 DEFB 01-00-01-00 60
44 DEFB 01-00-01-00 61
44 DEFB 01-00-01-00 62
40 DEFB 01-00-00-00 63
40 DEFB 01-00-00-00 64
40 DEFB 01-00-00-00 65
62 DEFB 01-10-00-10 66
44 DEFB 01-00-01-00 67
44 DEFB 01-00-01-00 68
44 DEFB 01-00-01-00 69
44 DEFB 01-00-01-00 6A
40 DEFB 01-00-00-00 6B
40 DEFB 01-00-00-00 6C
40 DEFB 01-00-00-00 6D
62 DEFB 01-10-00-10 6E
44 DEFB 01-00-01-00 6F
4BE8: 62 DEFB 01-10-00-10 70
62 DEFB 01-10-00-10 71
66 DEFB 01-10-01-10 72
6E DEFB 01-10-11-10 73
62 DEFB 01-10-00-10 74
62 DEFB 01-10-00-10 75
40 DEFB 01-00-00-00 76
62 DEFB 01-10-00-10 77
44 DEFB 01-00-01-00 78
44 DEFB 01-00-01-00 79
44 DEFB 01-00-01-00 7A
4C DEFB 01-00-11-00 7B
40 DEFB 01-00-00-00 7C
40 DEFB 01-00-00-00 7D
62 DEFB 01-10-00-10 7E
40 DEFB 01-00-00-00 7F
4BF8: 40 DEFB 01-00-00-00 80
40 DEFB 01-00-00-00 81
40 DEFB 01-00-00-00 82
40 DEFB 01-00-00-00 83
40 DEFB 01-00-00-00 84
40 DEFB 01-00-00-00 85
62 DEFB 01-10-00-10 86
40 DEFB 01-00-00-00 87
40 DEFB 01-00-00-00 88
40 DEFB 01-00-00-00 89
40 DEFB 01-00-00-00 8A
40 DEFB 01-00-00-00 8B
40 DEFB 01-00-00-00 8C
40 DEFB 01-00-00-00 8D
62 DEFB 01-10-00-10 8E
40 DEFB 01-00-00-00 8F
4C08: 40 DEFB 01-00-00-00 90
40 DEFB 01-00-00-00 91
40 DEFB 01-00-00-00 92
40 DEFB 01-00-00-00 93
40 DEFB 01-00-00-00 94
40 DEFB 01-00-00-00 95
62 DEFB 01-10-00-10 96
40 DEFB 01-00-00-00 97
40 DEFB 01-00-00-00 98
40 DEFB 01-00-00-00 99
40 DEFB 01-00-00-00 9A
40 DEFB 01-00-00-00 9B
40 DEFB 01-00-00-00 9C
40 DEFB 01-00-00-00 9D
62 DEFB 01-10-00-10 9E
40 DEFB 01-00-00-00 9F
4C18: 44 DEFB 01-00-01-00 A0
44 DEFB 01-00-01-00 A1
44 DEFB 01-00-01-00 A2
44 DEFB 01-00-01-00 A3
40 DEFB 01-00-00-00 A4
40 DEFB 01-00-00-00 A5
62 DEFB 01-10-00-10 A6
40 DEFB 01-00-00-00 A7
44 DEFB 01-00-01-00 A8
44 DEFB 01-00-01-00 A9
44 DEFB 01-00-01-00 AA
44 DEFB 01-00-01-00 AB
40 DEFB 01-00-00-00 AC
40 DEFB 01-00-00-00 AD
62 DEFB 01-10-00-10 AE
40 DEFB 01-00-00-00 AF
4C28: 44 DEFB 01-00-01-00 B0
44 DEFB 01-00-01-00 B1
44 DEFB 01-00-01-00 B2
44 DEFB 01-00-01-00 B3
40 DEFB 01-00-00-00 B4
40 DEFB 01-00-00-00 B5
62 DEFB 01-10-00-10 B6
40 DEFB 01-00-00-00 B7
44 DEFB 01-00-01-00 B8
44 DEFB 01-00-01-00 B9
44 DEFB 01-00-01-00 BA
44 DEFB 01-00-01-00 BB
40 DEFB 01-00-00-00 BC
40 DEFB 01-00-00-00 BD
62 DEFB 01-10-00-10 BE
40 DEFB 01-00-00-00 BF
4C38: 40 DEFB 01-00-00-00 C0
40 DEFB 01-00-00-00 C1
C0 DEFB 11-00-00-00 C2
C0 DEFB 11-00-00-00 C3
C0 DEFB 11-00-00-00 C4
40 DEFB 01-00-00-00 C5
80 DEFB 10-00-00-00 C6
40 DEFB 01-00-00-00 C7
40 DEFB 01-00-00-00 C8
40 DEFB 01-00-00-00 C9
C0 DEFB 11-00-00-00 CA
00 DEFB 00-00-00-00 CB
C0 DEFB 11-00-00-00 CC
C0 DEFB 11-00-00-00 CD
80 DEFB 10-00-00-00 CE
40 DEFB 01-00-00-00 CF
4C48: 40 DEFB 01-00-00-00 D0
40 DEFB 01-00-00-00 D1
C0 DEFB 11-00-00-00 D2
80 DEFB 10-00-00-00 D3
C0 DEFB 11-00-00-00 D4
40 DEFB 01-00-00-00 D5
80 DEFB 10-00-00-00 D6
40 DEFB 01-00-00-00 D7
40 DEFB 01-00-00-00 D8
40 DEFB 01-00-00-00 D9
C0 DEFB 11-00-00-00 DA
80 DEFB 10-00-00-00 DB
C0 DEFB 11-00-00-00 DC
00 DEFB 00-00-00-00 DD
80 DEFB 10-00-00-00 DE
40 DEFB 01-00-00-00 DF
4C58: 40 DEFB 01-00-00-00 E0
51 DEFB 01-01-00-01 E1
C0 DEFB 11-00-00-00 E2
51 DEFB 01-01-00-01 E3
C0 DEFB 11-00-00-00 E4
51 DEFB 01-01-00-01 E5
80 DEFB 10-00-00-00 E6
40 DEFB 01-00-00-00 E7
40 DEFB 01-00-00-00 E8
51 DEFB 01-01-00-01 E9
C0 DEFB 11-00-00-00 EA
51 DEFB 01-01-00-01 EB
C0 DEFB 11-00-00-00 EC
00 DEFB 00-00-00-00 ED
80 DEFB 10-00-00-00 EE
40 DEFB 01-00-00-00 EF
4C68: 40 DEFB 01-00-00-00 F0
40 DEFB 01-00-00-00 F1
C0 DEFB 11-00-00-00 F2
40 DEFB 01-00-00-00 F3
C0 DEFB 11-00-00-00 F4
40 DEFB 01-00-00-00 F5
80 DEFB 10-00-00-00 F6
40 DEFB 01-00-00-00 F7
40 DEFB 01-00-00-00 F8
51 DEFB 01-01-00-01 F9
C0 DEFB 11-00-00-00 FA
40 DEFB 01-00-00-00 FB
C0 DEFB 11-00-00-00 FC
00 DEFB 00-00-00-00 FD
80 DEFB 10-00-00-00 FE
40 DEFB 01-00-00-00 FF
256 bytes.
4C78: 2A994A LLIST2 LD HL,(LIMIT) Entry point (call this).
22974A LD (ADD2),HL
54 LD D,H
5D LD E,L
2A954A LD HL,(ADDRESS)
4C83: A7 NXTAD AND A Clear carry flag.
ED52 SBC HL,DE
19 ADD HL,DE
3802 JR C,PRINTAD
CF RST 08 Exit with error code
00 DEFB 00 of 0 + 1.
19 bytes.
4C8B: 7C PRINTAD LD A,H Print address.
CD824A CALL HPRINT
7D LD A,L
CD824A CALL HPRINT
AF XOR A Print space.
D7 RST 10
7E LD A,(HL) Get byte to disassemble.
11 bytes.
4C96: FECB ISITCB CP CB Is it CB*?
2015 JR NZ,ISITDDFDCB
23 INC HL
7E LD A,(HL) Validate next byte.
E6F0 AND F0
FE30 CP 30 Filter out 30 to 37 as they
2009 JR NZ,CBVALID are the only invalid
7E LD A,(HL) instructions after CB.
E608 AND 08
FE08 CP 08
2802 JR Z,CBVALID
1829 JR DATA
4CAB: 0602 CBVALID LD B,02 All instructions after CB
1827 JR DUMP are 1 byte.
25 bytes.
4CAF: FEDD ISITDDFDCB CP DD Is it DDCB* or FDCB*?
2804 JR Z,DDFDCBCONT
FEFD CP FD
2031 JR NZ,USELENS
4CB7: 23 DDFDCBCONT INC HL
7E LD A,(HL) Validate next byte.
FECB CP CB
202B JR NZ,USELENS
23 INC HL Point past displacement.
23 INC HL
7E LD A,(HL) Validate next byte.
FE36 CP 36 Valid instructions are *6
2810 JR Z,DATA and *E except 36 only.
E60F AND 0F
FE06 CP 06
2806 JR Z,DDFDCBVALID
FE0E CP 0E
2802 JR Z,DDFDCBVALID
1804 JR DATA
4CD0: 0604 DDFDCBVALID LD B,04 All instructions after DDCB
1802 JR DUMP are 2 bytes.
37 bytes.
4CD4: 0601 DATA LD B,01 Default byte dump count.
4CD6: 2A954A DUMP LD HL,(ADDRESS) Dump B bytes to screen.
4CD9: 7E NXBYT LD A,(HL)
CD824A CALL HPRINT
23 INC HL
10F9 DJNZ NXBYT
3E76 LD A,76 Print newline.
D7 RST 10
22954A LD (ADDRESS),HL
189B JR NXTAD
20 bytes.
4CE8: 0601 USELENS LD B,01 One byte for the DD, ED or
2A954A LD HL,(ADDRESS) FD prefix.
7E LD A,(HL)
4CEE: FEDD ISITLENSDD CP DD Is it DD*?
2004 JR NZ,ISITLENSED
0E04 LD C,04 Shift right count.
180E JR POINTOVR
4CF6: FEED ISITLENSED CP ED Is it ED*?
2004 JR NZ,ISITLENSFD
0E02 LD C,02 Shift right count.
1806 JR POINTOVR
4CFE: FEFD ISITLENSFD CP FD Is it FD*?
2006 JR NZ,ORDINARY
0E00 LD C,00 Shift right count.
4D04: 23 POINTOVR INC HL Point over prefix to the
7E LD A,(HL) following byte.
1804 JR GETLENSBYTE
4D08: 0600 ORDINARY LD B,00 No prefix byte.
0E06 LD C,06 Shift right count.
36 bytes.
4D0C: 264B GETLENSBYTE LD H,LENS-high Now we need to lookup the
C678 ADD A,LENS-low byte in the LENS table.
6F LD L,A Adding LENS-low may have
3001 JR NC,AISOK overflowed.
24 INC H If so increment H.
4D14: 7E AISOK LD A,(HL)
0C INC C Add 1 as we test first.
4D16: 0D SHIFTR DEC C
2804 JR Z,SHIFTOK
CB2F SRA A Shift A right by C bits.
18F9 JR SHIFTR
4D1D: E603 SHIFTOK AND 03 Isolate bits 0 and 1.
80 ADD A,B
47 LD B,A
18B3 JR DUMP
23 bytes.
Total 427 bytes.
The BASIC Part
2 PRINT "LENSLIST2"
3 GOSUB 600
4 RAND USR 19576
The above lines are in addition to the BASIC lines of
HEXLD3D which you still need to restore the machine
code to its correct destination.
Operating Instructions
Type RUN to use LENSLIST2.
HEXLD3D's original LIST can now be executed by RUN 10.
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