tape "load and save" to a PC/Mac

[Andrew Burton]

Exactly how long is the lead-in? I know on the Spectrum it is 4 seconds and I believe it is 2 seconds for the TRS-80. Not sure how long it is for the C64, but I'm sure you already know that.
My point is that the lead-in might have to be a precise length and you might have it too long (or too short).


Regards,
Andrew B
aliensrcooluk at yahoo.co.uk


--- On Wed, 18/11/09, Cameron Kaiser <spectre at floodgap.com> wrote:

From: Cameron Kaiser <spectre at floodgap.com>
Subject: Re: tape "load and save" to a PC/Mac
To: cctalk at classiccmp.org
Date: Wednesday, 18 November, 2009, 15:02

> And putting your output on a tape and trying to load that ?

Okay, I'll try that. Have to dig out the tape recorder though :)

> Because if that's a working soluntion a filter should do something..
> If there tape is generating only pulses the rise time could be affecting the
> smitt trigger or other signal shaping circuit. 

If so, though, I should be able to compensate for that. What kinds of things
could I do to the signal to make it more acceptable?

> Another thing, is it possible the tape set some kind of signal like write
> enable or read etc.. 

No, the Tomy tape recorder is a dumb recorder, I'm pretty sure. Also, there
are only in and out data lines on the cable.

> And last but not least, some tape stored programs have a kind of lead-in
> with enables the computer to sync on the tape signal.

Yes, I have the full sync mark accounted for, and made sure I gave plenty
of lead time before hitting SAVE and lead time after, so I'm sure I have
all the data.

-- 
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  Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com
-- Must have been the collard greens that made me lose control! -- "In the Mix"