News
Aug 12, 2010
Category: All news
Posted by: FUJI
- quick update - the name of "pwmi" block was changed to "pwml" ("levels" intead of "impulses"), to avoid confusion with the meaning of word "impulse" in PWM definition. Almost certainly no tape images were using this type of block until now, so the change should not break anything.
However this information is important for for those, who already use the CAS extensions proposed here in their software. Please update Your programs or give me a reasons for not making the mentioned change. - updated hex files on examples page (format of pwms block has changed in hex files)
Jun 1, 2010
Category: All news
Posted by: FUJI
- corrected new FSK decoding subroutines; effectiveness is almost as good as it was in version 0.94, but there are still some minor problems - sometimes the script enters endless loop, it is also a bit too sensitive to changes in frequencies of FSK signals
- changed the appearance of status/progress line
- fixed the command "info", detailed informations were slightly improved
- addedd checksum verification for Turbo 2600 tapes
- addedd additional type of checksum for FSK encoded tapes, custom loaders use it sometimes instead of default OS-based checksum; it is chosen automatically when needed
- added support for more Czechoslovakian turbo formats: Super Turbo (csst), Turbo Tape (cstt) and B-Tape (csbtape); there was very little testing done, because I have no access to real tapes recorded in these formats
- dropped commands "split" and "merge" - HEX files are good enough for any manipulations
- a number of other changes/fixes/tunning in the code
Apr 30, 2010
Category: All news
Posted by: FUJI
- 0.95 will follow soon, I must finish several things before that
- subroutines handling tapes in standard format were completely rewritten. It was needed for support of the additional kind of tape protection - data blocks built up from fragments of different baud rates. The ability to recover heavily broken tapes is a bit worse now (unfortunatelly), so please pay a bit more attention to sampling quality. Older version(s), which work better in really hard cases, will remain available for download.
- option "--autoadjust" is no longer needed for FSK encoded tapes
- option "--nofsk" (was undocumented) has been transformed into "--allfsk". Normally a8cas-util.pl stores only significant FSK signals in output file (cas, hex or audio). If You want all "junk" to be stored also, for debugging or recovery purposes, You must specify "--allfsk".
- the new command "squarify" was added. It can be used to convet original FSK ecoded signal into square wave, in which zeros and ones are represented by signal levels instead of different frequencies. It works like the old shell script, which started it all (available for download too). It differs from the effect caused by "--squarify", because the output is unaffected by any additional processing. You can use both files (created by "squarify" command and with "--squarify" switch) to precisely adjust IRG lenghths and baud rates to values matching original tape.
- renamed the name of turbo format czech2000 to cs2000 (it was developed in former CzechoSlovakia)
- Removed last addition to specification of "pwms" block - it seeems that it won't be needed at all
- updated examples to match changes in HEX format
Contact
fuji at arus dot net dot pl
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