Re: cassette interface data format?

[Benjamin Ketcham <bketcham@drizzle.com>]

Jayson Smith <nospamratguyspambegone@nospamplease.bellsouth.ihatespam.net> wrote:
> I'm just curious, are you trying to go completely diskless or just diskless
> for the bootup?

Completely diskless (locally).  I do have a "DuoDisk" unit, but I do not
wish to use it since no other computer system (that I have) can handle
the disks.

Ideally, I will use the cassette interface to bootstrap the system with
code that activates a faster interface.  Such as Super Serial, or perhaps
the "ap2222pc" method (serial comms over a game port line).  I am mostly
interested in transferring data *to* the Apple...

I.e., the PIC will function
essentially as a boot EPROM -- since I can easily program PICs, but
have long since lost the capability to burn traditional EPROMS as found
inside the Apple (and, a hack that requires no internal hardware mods
is aesthetically nicer in some ways).

--Benjamin

-------------
> "Benjamin Ketcham" <bketcham@drizzle.com> wrote in message
> news:1097316738.335224@yasure...
>> Jayson Smith <nospamratguyspambegone@nospamplease.bellsouth.ihatespam.net>
> wrote:
>> > There is no lead tone at the end.  You can see that if you've ever
> listened
>> > to a valid cassette dump.
>> > Jayson.
>>
>> Yes, so I discovered when I looked at the ROM contents.
>>
>> Michael Mahon's info was correct; I just wasn't implementing
>> it faithfully enough.
>> The problem was, I wasn't running the lead tone long enough
>> at the beginning.  It really does need to be *at least* 3.5 seconds
>> long.  Actually a bit more, 3.66s.
>> I was guessing/hoping that there was considerable margin there,
>> and giving it less than 1 second.  Nope.
>>
>> --Benjamin
>>
> 
>