Apple-2-SW/apple2_fantavision_reloaded
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Whitespace trailing cleanup

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Michaelangel007 2017-03-25 19:02:19 -07:00
parent a258049e3a
commit ba5036d561
1 changed files with 15 additions and 15 deletions
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README.md
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@ -63,7 +63,7 @@ _"Get off my LAN, Grandpa"_
* -- Any Generation Z kid born in the new millennium with WIFI.
Before Macromedia's [Flash](https://en.wikipedia.org/wiki/Adobe_Flash)
became ubiquitous back in 1985
became ubiquitous back in 1985
[Brøderbund](https://en.wikipedia.org/wiki/Broderbund)
released a fantastic animation program called `Fantavision`
@ -283,7 +283,7 @@ Now that we have the boot sector saved let's tear into it and see what it is doi
Now I could be a jerk and hand-wave it as
* _"Implementation Details"_ or the equally annoying
* _"Left as an Exercise for the Reader"_
* _"Left as an Exercise for the Reader"_
but I'll be nice guy and provide a fully documented disassembly:
@ -624,9 +624,9 @@ Let's map out the Track/Sector (T/S) boot stages
; 2 T15S2 1E00
; 2 T15SF 1F00
; ---------------------
; 2 B500
; 2 B500
; ---------------------
; ? BE00 T??S?
; ? BE00 T??S?
; ---------------------
```
@ -1433,22 +1433,22 @@ Let's disassemble $B500 ...
B508:A6 FD LDX rwts_SlotX16 ;
B50A:A9 80 LDA #$80 ; Attempt to read $8080 disk nibbles
B50C:85 3E STA Count ; Count
B50E:85 3F STA Count+1 ;
B50E:85 3F STA Count+1 ;
B510:A9 04 LDA #$04 ; Num "Sectors" or Pages to read
B512:85 3B STA NumSectors ;
B512:85 3B STA NumSectors ;
B514:A0 00 LDY #$00 ; Num disk nibbles read (actually is 1/2)
_B516:
B516:A9 00 LDA #$00 ; *** SELF-MODIFIED @ $B500 *** Dest Addr to Load at
B518:84 3C STY $3C ;
B518:84 3C STY $3C ;
B51A:85 3D STA DestPage ; DestPage
NextCount:
B51C:C6 3E DEC Count ; Force read counter
B51E:D0 06 BNE DoNibbleCheck1 ; to read at least once
B520:C6 3F DEC Count+1 ;
B522:D0 02 BNE DoNibbleCheck1 ;
B520:C6 3F DEC Count+1 ;
B522:D0 02 BNE DoNibbleCheck1 ;
B524:38 SEC ; FAIL nibble check 1
B525:60 RTS ;
B525:60 RTS ;
DoNibbleCheck1:
WaitNib1a: ; ^
@ -2040,7 +2040,7 @@ back in 1985!
is probably the most famous program to use byte-code -- back in 1980 -- predating
even Fantavisio by 5 years.
* The [Z-Machine](https://en.wikipedia.org/wiki/Z-machine) was created in 1979.
* The [Z-Machine](https://en.wikipedia.org/wiki/Z-machine) was created in 1979.
* [UCSD Pascal](https://en.wikipedia.org/wiki/UCSD_Pascal) is probably the second most famous example -- back in 1978 !
@ -2247,8 +2247,8 @@ DecodeToken:
0806: PLA
0807: STA $71 ; Save ReturnAddrHi
0809: _809 JSR $086D
080C:20 14 08 JSR $0814
080F:4C 09 08 JMP $0809
080C:20 14 08 JSR $0814
080F:4C 09 08 JMP $0809
_812 LDA #$8D ; CR ?
_814 BPL $0834 ; Never
@ -2280,11 +2280,11 @@ DecodeToken:
_844 RTS
GetNextToken: ; Leaves Token in A and X
_86D LDY #$00
_86D LDY #$00
INC $70
BNE $0875
INC $71
_875 LDA ($70),Y
_875 LDA ($70),Y
TAX TAX
0878:RTS RTS