6502 image from https://www pagetable com/?p=1295 10 mode opcode “ Group one” add, compare; most addressing modes Indirect Indexed 11 ORA OR
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6502 Addressing Modes Implied/ Absolute Indirect ($aaaa) INDERECT The operand JMP is the only instruction to use this addressing mode if $aaaa
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The only instruction in the 6502 instruction set that can use true (or "absolute") indirect addressing is the JMP instruction As you'll recall from the last chapter,
Appendix 1: 6502 Instruction Set
Again, like indirect indexed addressing, indexed indirect requires the location PNTER to be in zero page The diagram below illustrates the pair of instructions LDA
8 Addressing Modes I
The 6502 and 65C02 have quite small instruction sets when compared with some of Program 6 uses both zero page and immediate addressing to place an
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6502 image from https://www pagetable com/?p=1295 10 mode opcode “ Group one” add, compare; most addressing modes Indirect Indexed 11 ORA OR
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In indirect indexed addressing (referred to as [Indirect), Y), the second byte of the instruction points to a memory loca- tion in page zero The contents of this
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AdvancedAssembly
Programming
for theApple IIStephen A. Edwards6502 image fromhttps://www.pagetable.com/?p=1295
6502 image fromhttps://www.pagetable.com/?p=1295
DATA BUSADDR.
ADDRESS BUS
65024021222324252627282930313233343536373839
1201918171615141312111098765432
V SSA12A13A14A15D7D6D5D4D3D2D1D0
(IN) SO V SSA11A10A9A8A7A6A5A4A3A2A1A0V
CCSYNCRDY
(OUT)1IRQNMI
R/W 02 (OUT)RESAfter Bill Bertram, Wikipedia
The 6502 Programmer"s Model
07AACCUMULATOR
YINDEX REGISTERXINDEX REGISTER
15PCLPCHPROGRAM COUNTER
S1STACK POINTER
STATUS REGISTERC
CarryZ
ZeroIInterrupt DisableD
Decimal ModeB
BreakV
OverflowN
Negative
The 6502 Programmer"s Model
07AACCUMULATOR
YINDEX REGISTERXINDEX REGISTER
15PCLPCHPROGRAM COUNTER
S1STACK POINTER
STATUS REGISTERC
CarryZ
ZeroIInterrupt DisableD
Decimal ModeB
BreakV
OverflowN
Negative
The 6502 Programmer"s Model
07AACCUMULATOR
YINDEX REGISTERXINDEX REGISTER
15PCLPCHPROGRAM COUNTER
S1STACK POINTER
STATUS REGISTERC
CarryZ
ZeroIInterrupt DisableD
Decimal ModeB
BreakV
OverflowN
Negative
The 6502 Programmer"s Model
07AACCUMULATOR
YINDEX REGISTERXINDEX REGISTER
15PCLPCHPROGRAM COUNTER
S1STACK POINTER
STATUS REGISTERC
CarryZ
ZeroIInterrupt DisableD
Decimal ModeB
BreakV
OverflowN
Negative
The 6502 Programmer"s Model
07AACCUMULATOR
YINDEX REGISTERXINDEX REGISTER
15PCLPCHPROGRAM COUNTER
S1STACK POINTER
STATUS REGISTERC
CarryZ
ZeroIInterrupt DisableD
Decimal ModeB
BreakV
OverflowN
Negative
The 6502 Programmer"s Model
07AACCUMULATOR
YINDEX REGISTERXINDEX REGISTER
15PCLPCHPROGRAM COUNTER
S1STACK POINTER
STATUS REGISTERC
CarryZ
ZeroIInterrupt DisableD
Decimal ModeB
BreakV
OverflowN
Negative
Source: Visual6502.org
Source: Visual6502.org
Source: Visual6502.org
6502 Instruction Encoding
groupmodeopcode groupmodeopcodeliteral or address groupmodeopcodelow address bytehigh address byte6502 Instruction Encoding
10modeopcode"Group one" add, compare; most addressing modes
01modeopcode"Group two" shift/rotate, load/store X; fewer modes
001modeopcodeLoad/store Y, compare X & Y
0xy01op1Index register instructions
00011flagFlag set/clear
00001vflagBranches
0op0op000Stack instructions
11Unused in the 6502
6502 Instruction Encoding
10modeopcode"Group one" add, compare; most addressing modes
01modeopcode"Group two" shift/rotate, load/store X; fewer modes
001modeopcodeLoad/store Y, compare X & Y
0xy01op1Index register instructions
00011flagFlag set/clear
00001vflagBranches
0op0op000Stack instructions
11Unused in the 6502
6502 Instruction Encoding
10modeopcode"Group one" add, compare; most addressing modes
01modeopcode"Group two" shift/rotate, load/store X; fewer modes
001modeopcodeLoad/store Y, compare X & Y
0xy01op1Index register instructions
00011flagFlag set/clear
00001vflagBranches
0op0op000Stack instructions
11Unused in the 6502
6502 Instruction Encoding
10modeopcode"Group one" add, compare; most addressing modes
01modeopcode"Group two" shift/rotate, load/store X; fewer modes
001modeopcodeLoad/store Y, compare X & Y
0xy01op1Index register instructions
00011flagFlag set/clear
00001vflagBranches
0op0op000Stack instructions
11Unused in the 6502
Group One Instructions10modeopcode
A9 42LDA#$42; LoadAccumulator Immediate A9LDA
A#$42 42Group One Instructions10modeopcode
A9 42LDA#$42; LoadAccumulator Immediate A9LDA
A#$42 42Group One Instructions10modeopcode
A9 42LDA#$42; LoadAccumulator Immediate 85 42STA$42; StoreAccumulator Zero Page 42STA$42 42$42Zero Page
Memory
Group One Instructions10modeopcode
A9 42LDA#$42; LoadAccumulator Immediate 85 42STA$42; StoreAccumulator Zero Page 42STA$42 42$42Zero Page
MemoryA
Group One Instructions10modeopcode
A9 42LDA#$42; LoadAccumulator Immediate 85 42STA$42; StoreAccumulator Zero Page 75 42ADC$42,X; Addwith Carry Zero Page Indexed by X $42,XADC
CZero Page
Memory$42,X
42A
Group One Instructions10modeopcode
A9 42LDA#$42; LoadAccumulator Immediate 85 42STA$42; StoreAccumulator Zero Page 75 42ADC$42,X; Addwith Carry Zero Page Indexed by X $42,XADC
C$42,X
42AX+ $42 + XZero Page
Memory
Group One Instructions10modeopcode
A9 42LDA#$42; LoadAccumulator Immediate 85 42STA$42; StoreAccumulator Zero Page 75 42ADC$42,X; Addwith Carry Zero Page Indexed by X ED 01 42SBC$4201; Subtractw /CarryAbsolute EDSBC
Memory$4201
0142A C
Group One Instructions10modeopcode
A9 42LDA#$42; LoadAccumulator Immediate 85 42STA$42; StoreAccumulator Zero Page 75 42ADC$42,X; Addwith Carry Zero Page Indexed by X ED 01 42SBC$4201; Subtractw /CarryAbsolute EDSBC
$4201Memory$4201 0142A C
Group One Instructions10modeopcode
A9 42LDA#$42; LoadAccumulator Immediate 85 42STA$42; StoreAccumulator Zero Page 75 42ADC$42,X; Addwith Carry Zero Page Indexed by X ED 01 42SBC$4201; Subtractw /CarryAbsolute DD 05 42CMP$4205,X; CompareAbsolute Indexed by X DDCMP
Memory$4205
0542A N Z C
Group One Instructions10modeopcode
A9 42LDA#$42; LoadAccumulator Immediate 85 42STA$42; StoreAccumulator Zero Page 75 42ADC$42,X; Addwith Carry Zero Page Indexed by X ED 01 42SBC$4201; Subtractw /CarryAbsolute DD 05 42CMP$4205,X; CompareAbsolute Indexed by X DDCMP
$4205 + XMemory$4205 0542A
N Z CX+
Group One Instructions10modeopcode
A9 42LDA#$42; LoadAccumulator Immediate 85 42STA$42; StoreAccumulator Zero Page 75 42ADC$42,X; Addwith Carry Zero Page Indexed by X ED 01 42SBC$4201; Subtractw /CarryAbsolute DD 05 42CMP$4205,X; CompareAbsolute Indexed by X 39 06 42AND$4206,Y; LogicalAND Absolute Indexed by Y 39AND
Memory$4206,Y
0642AAND
Group One Instructions10modeopcode
A9 42LDA#$42; LoadAccumulator Immediate 85 42STA$42; StoreAccumulator Zero Page 75 42ADC$42,X; Addwith Carry Zero Page Indexed by X ED 01 42SBC$4201; Subtractw /CarryAbsolute DD 05 42CMP$4205,X; CompareAbsolute Indexed by X 39 06 42AND$4206,Y; LogicalAND Absolute Indexed by Y 39AND
Y $4206 + YMemory+$4206,Y 0642AAND
Group One Instructions10modeopcode
A9 42LDA#$42; LoadAccumulator Immediate 85 42STA$42; StoreAccumulator Zero Page 75 42ADC$42,X; Addwith Carry Zero Page Indexed by X ED 01 42SBC$4201; Subtractw /CarryAbsolute DD 05 42CMP$4205,X; CompareAbsolute Indexed by X 39 06 42AND$4206,Y; LogicalAND Absolute Indexed by Y 11 42ORA($42),Y; LogicalOR Indirect Indexed 11ORA
OR($42),Y
42AMemory
Group One Instructions10modeopcode
A9 42LDA#$42; LoadAccumulator Immediate 85 42STA$42; StoreAccumulator Zero Page 75 42ADC$42,X; Addwith Carry Zero Page Indexed by X ED 01 42SBC$4201; Subtractw /CarryAbsolute DD 05 42CMP$4205,X; CompareAbsolute Indexed by X 39 06 42AND$4206,Y; LogicalAND Absolute Indexed by Y 11 42ORA($42),Y; LogicalOR Indirect Indexed 11ORA
$42 $43Zero PageMemoryOR($42),Y
42AMemory
Group One Instructions10modeopcode
A9 42LDA#$42; LoadAccumulator Immediate 85 42STA$42; StoreAccumulator Zero Page 75 42ADC$42,X; Addwith Carry Zero Page Indexed by X ED 01 42SBC$4201; Subtractw /CarryAbsolute DD 05 42CMP$4205,X; CompareAbsolute Indexed by X 39 06 42AND$4206,Y; LogicalAND Absolute Indexed by Y 11 42ORA($42),Y; LogicalOR Indirect Indexed 11ORA
$42 $43Zero PageMemoryOR($42),Y
42AY +Memory
Group One Instructions10modeopcode
A9 42LDA#$42; LoadAccumulator Immediate 85 42STA$42; StoreAccumulator Zero Page 75 42ADC$42,X; Addwith Carry Zero Page Indexed by X ED 01 42SBC$4201; Subtractw /CarryAbsolute DD 05 42CMP$4205,X; CompareAbsolute Indexed by X 39 06 42AND$4206,Y; LogicalAND Absolute Indexed by Y 11 42ORA($42),Y; LogicalOR Indirect Indexed 41 42EOR($42,X); ExclusiveOR Indexed Indirect 41EOR
Memory($42,X)
42XORA
Group One Instructions10modeopcode
A9 42LDA#$42; LoadAccumulator Immediate 85 42STA$42; StoreAccumulator Zero Page 75 42ADC$42,X; Addwith Carry Zero Page Indexed by X ED 01 42SBC$4201; Subtractw /CarryAbsolute DD 05 42CMP$4205,X; CompareAbsolute Indexed by X 39 06 42AND$4206,Y; LogicalAND Absolute Indexed by Y 11 42ORA($42),Y; LogicalOR Indirect Indexed 41 42EOR($42,X); ExclusiveOR Indexed Indirect 41EOR
X+ $42 + X $43 + XZero PageMemoryMemory($42,X)
42XORA
Group One Instructions10modeopcode
A9 42LDA#$42; LoadAccumulator Immediate 85 42STA$42; StoreAccumulator Zero Page 75 42ADC$42,X; Addwith Carry Zero Page Indexed by X ED 01 42SBC$4201; Subtractw /CarryAbsolute DD 05 42CMP$4205,X; CompareAbsolute Indexed by X 39 06 42AND$4206,Y; LogicalAND Absolute Indexed by Y 11 42ORA($42),Y; LogicalOR Indirect Indexed 41 42EOR($42,X); ExclusiveOR Indexed Indirect 41EOR
X+ $42 + X $43 + XZero PageMemoryMemory($42,X)
42XORA
Apple II Zero
Page UsageMonitorApplesoftDOS 3.3ProDOS
Source: comp.sys.apple2 FAQ, Wagner,
Wirth and Lechner0
01 12 2334
45
56
67
78
89
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Apple II Zero
Page UsageMonitorApplesoftDOS 3.3ProDOS
Source: comp.sys.apple2 FAQ, Wagner,
Wirth and Lechner0
01 12 2334
45
56
67
78
89
9A AB BC CD DE EF F
Apple II Zero
Page UsageMonitorApplesoftDOS 3.3ProDOS
Source: comp.sys.apple2 FAQ, Wagner,
Wirth and Lechner0
01 12 2334
45
56
67
78
89
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