From: fake@example.com
dado wrote:
> HI.
> How to conwert .bin games to wav or mp3 and load in coco2 ?
> Thanks
The bin file is most likely RSDOS binary files. RSDOS supports
segemented binaries and the Color BASIC cassette format does not.
So to determine if it is possible do this conversion, you need to
determine if the bin file has more that one segment.
Lets look at the format for a bin file:
Preamble Block:
Offset Size Meaning
0 1 00 - Preamble flag
1 2 Length of data block
3 2 Load Address
Data Block:
Offset Size Meaning
0 taken from preamble data to be stored in RAM
[additional preamble and data blocks as necessary]
Postamble Block:
Offset Size Meaning
0 1 FF - Postamble flag
1 2 0000 - reserved
3 2 Execution address
So determine if your bin files has multiple data blocks. If so, then you
can't convert it into a single Color BASIC cassette file.
Next you'll need to determine if the program code requires Disk BASIC.
You'll want to disasemble the data blocks and look for things like:
Jumps into ROM at $C000-$EFFF (Disk BASIC ROM)
Reads and writes to $FF40, and $FF48-$FF4B (Disk controller I/O)
No point of converting the file if it needs hardware you don't have.
Now to make the Color BASIC cassette file. The file is make up of a
sinusoildal wave of 1200 hertz representating a zero bit and 2400 hertz
representating a one bit. A byte is recorded (little end first) by using
these wave forms in series.
Asside:
My measurements suggest the actualy frequency values are
1094.68085106384 and 2004.54545454545 hertz.
The Color BASIC cassette file is also made up of blocks, a key
difference is the blocks have a maximum size.
The first block is called a leader it is 128 bytes of value $55. Leader
blocks are always inserted into the stream if a gap between 2 block
required the tape drive motor to be stopped. This happens between files
and even between blocks in the same file if long computation was
required before writing the next block.
Color BASIC uses the leader for timing purposes.
The next block is a header block:
Offset Size Meaning
0 2 553C - Block start
2 1 00 - Header block flag
3 1 0F - Header blck size (in bytes)
4 8 Filename
12 1 File type - 0 BASIC, 1 DATA, 2 M/L Binary
13 1 Data Type - 0 binary, FF ASCII
14 1 Gap Flag - 0 no gaps, FF gaps
15 2 Start Address
17 2 Execution Address
19 1 Checksum from offset 2 thru 18, init with zero
20 1 55 - End ID
After the header block Color BASIC needs a half second to process the
data, then another leader block.
Now a series of data blocks:
Offset Size Meaning
0 2 553C - Block start
2 1 01 - Data Block flag
3 1 Block size
4 X Data bytes
4+X 1 Checksum from offset 2 thru X, init with zero
5+x 1 55 - End ID
I measured about 0.003 seconds between each data block, with no leader
if the the motor is not stopped.
Finally an End of File block:
Offset Size Meaning
0 2 553C - Block start
2 1 FF - EOF Block flag
3 1 00 - Size
4 1 checksum from offsets 2 thru 3, init with zero
5 1 55 - End ID
Recently I added a utility called makewav to the Toolshed project on
SourceForge. Normally makewav take S Records as input, but I just added
a raw binary option. You can use this raw option to put extracted data
from the bin file into a wav file.
Later, I may add direct support of converting Disk BASIC bin files to
Color BASIC casette files.
Toolshed is suppilied only as source, no executable binaries. The build
files for unix and Mac OS X are up to date. But Windows build file are
not, it'll take a porter to bring them up to date.
--
The ears are too length.
--------------------------------------------------------------
tim lindner: First initial last name at macmess dot org
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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