From: si@si.si
On Thu, 31 Jan 2008 22:41:39 +0100, Knut Roll-Lund
wrote:
>Bu wrote:
>> On Tue, 29 Jan 2008 23:10:26 -0800 (PST), Progress City
>> wrote:
>>
>>
>>>I have a VERY OLD basic program (TRS-80 Model 1, Level 2) that is
>>>saved in standard tokenized form. I'd like to convert it to plain
>>>text. Is there a utility for Windows XP that will do this?
>>
>>
>> On what medium do you have the 'source'; paper, cassette file,
>> diskfile or maybe a wav file?
>> Keep in mind that for instance in a cassette file every line statrts
>> with an memory address ( 2 bytes) followed by a linenumber (2 bytes)
>> and than the code.
>>
>> In the code part you can replace every token (byte or character value
>> above 127) with the actual basic word.
>> Below you find all the tokens.
>>
>> Bu
>>
>> Tokens(128) = "END": Tokens(129) = "FOR": Tokens(130) = "RESET":
>...
>
>In WAV2CAS I use the addresses you mention for checking correctness by
>keeping track of it when I encounter the next line. And because of it I
>can identify which basic that created the file, what model and what
>version of disk basic. BASIC ignores these addresses completely,
>regenerating them while loading so they match the current configuration.
I was also playing a littlebit around with 'decodong' wav files and
wanted to use the addresses for consistency checking of the
basic-file. I found soon that there is no strict relation between
addresses of the one statement line and the next. I guess if you saved
a basic program after some heavy editing (deleting lines) the address
pointers do not mean anything in a listing (and can not be used for
consistency checking of a saved basic file).
You mention you can identify what basic based of the addresses. Can
you explain this a little bit more as i am interested in this.
>
>The addresses are a linked list used and when you GOTO or GOSUB. Basic
>search from the beginning of the program using the addresses to search
>for the specified line number. Which means that a GOTO to a line earlier
>in the program is excuted faster than a GOTO to a line further into the
>program... Compiler basic converts GOTO and GOSUB's int real jumps and
>calls to avoid this overhead.
I once wrote a level2 basic program that needed all the speed it could
get so i placed a.o. all often called procedures in the low line
numbers beside using no numbers but only variables etc.
>
>I would use an emulator and LLIST it to a PC file or SAVE"FUN/BAS",A for
>an ascii save etc.
But then you need first to get it into the emulator (:-). And this
depends on which media you have the data. And you can't type the
tokens into the basic of the emulator.
Maybe the easiest way is to write a small program (for instance in VB)
to convert the data/tokens. For input you can use either a file or
just type it in.
>
>BTW I intend WAV2CAS to be able to save ascii format and read BAS, CMD
>and CAS files as well as WAV. I have actually found out the problem I
>had. It was a mistake, a bug, in the decoding of highspeed system tapes
>(doesn't affect basic), model III stuff. A few bits at the en were lost
>due to the fact that highspeed saves 9 bit per byte (a startbit is used)
>so significant bits at the end (highbyte of the transfer address) might
>be afffected. I'll release the new versions very soon.
The program i wrote (if you want to have a look at it see
www.geocities.com/butchijo/TRS.html ) 'decodes' wav files and produces
readable listings of basic files (*.cas)
Thanks for sharing your thougts on this
Bu
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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