explained similarities >3, some documentation update

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FeralChild64 committed 2020-01-17 20:11:59 +01:00
1 parent 13d8c63be4
commit 585d37c899
37 files changed
+134 -19

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$03 + JSR $E8EA
Instruction (calling a well-known subroutine for screen line scrolling) + some part. Trivial, not copyrightable.
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$03 + JMP$xx13
Not even a full instruction. Trivial - not coprightable.
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$03 + LDA #$00 + STA (zeropage address does not match)
Instruction (loading 0 to accumulator) + some parts. Trivial - not copyrightable.
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$18 + JSR $E9FF
Call to a well-known routine + some part. Trivial - not copyrightable.
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AND #$02 + BNE (offset matches)
Check for some bits in the accumulator. Trivial - not copyrightable.
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PHA + LDA $AD + PHA + LDA (zeropage address does not match)
Part of the instruction sequence restoring a well-known 16-bit zeropage variable from a stack. Trivial - not copyrightable.
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PHA + LDA $AE + PHA
Retrievin some data from the stack, among them matching zeropage variable. Trivial - not copyyrightable.
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PHA + LDA $AE + PHA + LDA (zeropage address does not match)
Part of the instruction sequence restoring a well-known 16-bit zeropage variable from a stack. Trivial - not copyrightable.
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PHA + STA $AD + PHA + STA (zeropage address does not match)
Part of the instruction sequence storing a well-known 16-bit zeropage variable on a stack. Trivial - not copyrightable.
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PHA + STA $AE + PHA + STA (zeropage address does not match)
Part of the instruction sequence storing a well-known 16-bit zeropage variable on a stack. Trivial - not copyrightable.
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SEI + LDA #$00 + STA (zeropage address does not match)
Disable interrupts, store 0 in some memoryy location (address does not match). Trivial and not creative - not copyrightable.
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STY $D3 + JMP (address does not match)
Instruction (storing data in a well-known memory location) + some part. Trivial - not copyrightable.
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STX $D6 + JSR $E56C + LDY (zeropage address deos not match)
Update one screen-related value with coontent of X register, call a well-known routine to adjust remaining ones - trivial, not copyrightable.
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$0288 + STA $AD
Instruction + some part (address of a documented variable). Trivial - not copyrioghtable.
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TXA + PHA + LDA #$01
Store .X register on the stack (would be a single instruction on 65C02) + loading accumulator with 1. Trivial and not creative - not copyrightable.
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TYA + PHA + TXA + PHA
Store Y and X CPU registers on a stack (would be only 2 instruction on 65C02 and above). Trivial - not copyrightable.
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LDY #$00 + TYA + STA ($2B),Y
6502 way to store 0 in a memory location pointed by a well-known pointer. Trivial - not copyrightable.
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LDY #$02 + LDA #$00 + STA (address does not match)
Put $02 to Y register, put 0 into accumulator and store it somewhere (address does not match) - trivial, not copyrightable.
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LDY #$27 + LDA ($AC),Y + STA (zeroopage address deos not match),Y
Get the last character from the screen line (using a documented vector) and store it somewhere (details differ here). Trivial - not copyrightable.
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LDY #$E4 + JSR $AB1E
Print a string by calling a well-known routine, only part of the string address matches. Trivial - not copyrightable.
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LDX #$18 + JSR $E9FF
Clear the last screen line by calling a well-known routine. Trivial - not copyrightable.
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LDX #$18 + JSR $E9FF + DEX + BPL (go back to JSR)
Clear the whole screen by repeatedly calling a well-known routine to clear a single line. Not creative - not copyrightable.
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LDA $AC + PHA + LDA (zeropage address does not match)
Storing some data on a stack, among them the same zeropage variable - trivial, not copyrightable.
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LDA #$01 + BIT (to skip next instruction) + LDA # (value does not match)
Setting accumulator to $01 or some other value (not included in similarity) depending on some condition (also not included in the similarity). Trivial - not copyrightable.
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LDA #$01 + BIT (skip next instruction) + LDA #$00
Part of code setting accumulator to 0 or 1 depending on some condition (check not included in similarity). Trivial - not copyrightable.
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LDA #$20 + STA ($D1),Y + DEY + BPL (offset does not match)
Part of the loop filling area of the screen with spaces. Not creative - not coprightable.
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TAX + PLA + TAY
Simple register manipulation to retrieve .Y from the stack without losing .A. Trivial - not copyrightable.
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TAX + PLA + TAY + LDA (zeropage address does not match)
Some simple stack/register data transfer + loading accumulator from memory (address does not match) - trivial. Not copyrightable.
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$C3 + STA $AE + LDA (zeropage adddress does not match)
Instruction + some parts. Trivial - noot copyrightable.
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INY + LDA ($D1),Y + DEY + STA ($D1),Y + INY
Part of the loop moving some memory content (pointed by a zeropage variable) by 1 byte. Not creative - not copyrightable.
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INY + LDA ($F3),Y + DEY + STA ($F3),Y + INY
Part of the loop moving some memory content (pointed by a zeropage variable) by 1 byte. Not creative - not copyrightable.
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BNE (offset matches) + LDA #$80 + STA (zeropage address does not match)
Depending on some condition (check does not fully match) store $80 in some memoryy location (address does not match). Trivial - not copyrightable.
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$E4 + JSR $AB1E
Call to a well-known routine + some part. Trivial - not copyrightable.
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$EA + LDA $01 + AND #$10
Clearing bit on bte fetched from a documented hardware port + some part of other instruction. Trivial - not copyyrightable.
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$EC + CLC + RTS (end of routine) + JSR (address does not match)
Routine ending with enabling interrupts + beginning of another one (just instruction opcode matches, not the argument). Trivial - not copyrightable.
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$FF + JSR$xx06
Not even a full instruction. Trivial - not copyrightable.