[Coco] New! Cassette to floppies

[Bob Devries]

Robert,
I suggest you check out this page: 
http://www.cs.unc.edu/~yakowenk/coco/text/tapeformat.html

I have been using those peeks and pokes to transfer machine code programmes 
to disk for many years, and always with complete success!.
--
Regards, Bob Devries, Dalby, Queensland, Australia

Isaiah 50:4 The sovereign Lord has given me
the capacity to be his spokesman,
so that I know how to help the weary.

website: http://www.home.gil.com.au/~bdevasl
my blog: http://bdevries.invigorated.org/

----- Original Message ----- 
From: "Robert Gault" <robert.gault at worldnet.att.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Thursday, November 03, 2005 12:02 AM
Subject: Re: [Coco] New! Cassette to floppies


> Bob, I think you should check the CLOAD and CLOADM code. The start address 
> at $7E-$7F is a pointer to the load address as you say. But, each block 
> read from the tape changes the $7E-$7F value. Any long program whether 
> Basic or ml will use more than one tape block; they're 255 bytes. This 
> will happen with ml programs even if the program loads to contiguous 
> memory. There is no cassette equivalent to disk single record format.
>
> The end address you have given is located within the cassette data buffer 
> at $1DA-$2D9. That does not seem a good place to have a pointer. There is 
> no mention of an end pointer (I can find) in the CLOAD code.
>
> Bob Devries wrote:
>> The START, END, and EXEC addresses of a binary file on tape are in fact 
>> easy to fine, **PROVIDED** the file is contiguous, and not one of the 
>> multi-block ones.
>>
>> START ADDRESS = PEEK(487) * 256 + PEEK(488)
>> END ADDRESS = PEEK(126) * 256 + PEEK(127) -1
>> EXEC ADDRESS = PEEK(157) * 256 + PEEK(158)
>>
>> If the file is of the multi-block format, you're on your own. :) You can 
>> easily hear the difference by listening to the sound of the file being 
>> played on the tape. If there's gaps in the data stream (except for the 
>> short one after the name block, then it's a multiblock file).
>>
>> Many games had a pre-loader, which auto-executed, and loaded the rest of 
>> the programme. These are more difficult to transfer to disk.
>> -- 
>> Regards, Bob Devries, Dalby, Queensland, Australia
>>
>> Isaiah 50:4 The sovereign Lord has given me
>> the capacity to be his spokesman,
>> so that I know how to help the weary.
>>
>> website: http://www.home.gil.com.au/~bdevasl
>> my blog: http://bdevries.invigorated.org/
>>
>>
>
> -- 
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