[sebhc] Re: H8 data record format

[Scott LaBombard]

Thanks Steven. I understand the difference between the tape format
raw binary ... I think what I am am most interested in at this point is
if/how the tape format is different from the ABS format used for
executables within HDOS. Thx again ...


Scott

----- Original Message ----- 
From: "Steven Parker" <sp11 at hotmail.com>
To: <sebhc at sebhc.org>
Sent: Thursday, May 06, 2004 4:27 PM
Subject: [sebhc] Re: H8 data record format


> Scott asks:
> >Hmmm ... I'm not clear if/how the 'Tape Format' described is related the
> >'Absolute Binary Format'. Anyone know?
> 
> Sure thing.  The .PID (AKA .tape) format contains all the bytes that would 
> be written to a tape in a dump operation.  This makes it ideal for 
> emulation.  In the case of a PAM-8 dump this would be:
> 
>       bytes    contents
> 
>         32      SYN chars (0x16)
>          1      STX char (0x02)
>          1      record type / end flag
>          1      block sequence number
>          2      byte count (of data)
>          2      execute address
>          2      load address
>         (cnt)   data bytes
>          2      checksum
>          2      extra bytes to flush buffer (actually a 2nd copy of 
> checksum)
> 
>         (the above may be repeated for multiple-block files)
> 
> The .BIN binary format is just the data bytes.   Since the execute and load 
> address are missing, and there's no way to represent non-contiguous multiple 
> blocks, it is therefore not as well suited for storing tape software.
> 
> Cheers,
> 
> - Steven
> 
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