diff options
Diffstat (limited to 'xex.5')
-rw-r--r-- | xex.5 | 32 |
1 files changed, 16 insertions, 16 deletions
@@ -173,29 +173,29 @@ offset 16: 60 E0 02 E1 02 00 06 This is a complete (though short) XEX file, and it can be loaded from the DOS menu (or D1: prompt, if you use a command\-line\-based DOS). .sp -The first 2 bytes ($FF, $FF) are the signature for the initial +The first 2 bytes (\fB$FF\fP, \fB$FF\fP) are the signature for the initial segment header. .sp -The next 2 bytes ($00, $06) are the load address of the first segment -($0600, in 6502\-style LSB\-first notation). +The next 2 bytes (\fB$00\fP, \fB$06\fP) are the load address of the first segment +(\fB$0600\fP, in 6502\-style LSB\-first notation). .sp -The next 2 bytes ($0A, $06) are the end address ($060A). +The next 2 bytes (\fB$0A\fP, \fB$06\fP) are the end address (\fB$060A\fP). .sp -Since the header says to load data from $0600 to $060A, there are 11 -data bytes in the segment, beginning with $A9, $00 (the 6502 object -code for the \fILDA #0\fP instruction), and extending to the $60 (RTS +Since the header says to load data from \fB$0600\fP to \fB$060A\fP, there are 11 +data bytes in the segment, beginning with \fB$A9\fP, \fB$00\fP (the 6502 object +code for the \fILDA #0\fP instruction), and extending to the \fB$60\fP (\fIRTS\fP opcode) at offset 16. .sp The data from the first segment is immediately followed by the header -of the next segment, at offset 17. A $FF, $FF signature would be allowed +of the next segment, at offset 17. A \fB$FF\fP, \fB$FF\fP signature would be allowed here, but in the example, the 2nd segment uses the 4\-byte header. .sp -At offset 17, the $E0, $02 (aka $02E0) is the load address. $E1, $02 -($02E1) is the end address. $02E0/$02E1 is known as \fIRUNAD\fP in the +At offset 17, the \fB$E0\fP, \fB$02\fP (aka \fB$02E0\fP) is the load address. \fB$E1\fP, \fB$02\fP +(\fB$02E1\fP) is the end address. \fB$02E0\fP, \fB$02E1\fP is known as \fIRUNAD\fP in the Atari world, and it\(aqs the address where DOS will find the entry point to the program when it\(aqs done being loaded. .sp -The next (and last) 2 bytes are $00, $06 (aka $0600), which is the run +The next (and last) 2 bytes are \fB$00\fP, \fB$06\fP (aka \fB$0600\fP), which is the run address itself (to be deposited at \fIRUNAD\fP). .sp There are no more segments, since we\(aqve reached end of file. @@ -245,12 +245,12 @@ ff ff C5 02 C6 02 0F 00 .UNINDENT .UNINDENT .sp -The file begins with $FF, $FF header, then the 2\-byte load address -($C5, $02 for address $02C5), then the 2\-byte end address ($C6, $02, -aka $02C6), then the 2 bytes of data to be stored there ($0F, $00). +The file begins with \fB$FF\fP, \fB$FF\fP header, then the 2\-byte load address +(\fB$C5\fP, \fB$02\fP for address \fB$02C5\fP), then the 2\-byte end address (\fB$C6\fP, \fB$02\fP, +aka \fB$02C6\fP), then the 2 bytes of data to be stored there (\fB$0F\fP, \fB$00\fP). .sp -When loaded, this will store $0F at address $02C5 (aka \fICOLOR0\fP, -the text luminance in \fIGRAPHICS 0\fP) and $00 at $02C6 (\fICOLOR1\fP, the +When loaded, this will store \fB$0F\fP at address \fB$02C5\fP (aka \fICOLOR0\fP, +the text luminance in \fIGRAPHICS 0\fP) and \fB$00\fP at \fB$02C6\fP (\fICOLOR1\fP, the \fIGRAPHICS 0\fP background color). .sp Notice that there\(aqs no run or init address. That\(aqs because no code is |