Re: PET interrupt routine and IEEE load

From: Rhialto <>
Date: Sat, 19 Feb 2011 15:29:52 +0100
Message-ID: <>
On Sat 19 Feb 2011 at 14:34:42 +0100, "André Fachat" wrote:
> Now my questions:
> - anyone knows what this routine is really for, resp. why is it
> called from after the end of the LOAD? It seems this is actually 
> tape-related (in fact on RUN/STOP it resets the interrupt pointers,
> disabling the driver!)

That it is really tape-related was also what I was thinking while
reading your description. After all tape loading uses different IRQ
vectors at different times. But tape reading is the part I least
understand of the PET ROMs... even writing is relatively straightforward
but still complex compared with all the rest. (And I don't have my own
annotated disassembly at hand right now). (I once wrote an article in
the PBE magazine about the topic but I don't think it went into any
readying detail either)

> André
___ Olaf 'Rhialto' Seibert  -- There's no point being grown-up if you 
\X/ rhialto/at/    -- can't be childish sometimes. -The 4th Doctor

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Received on 2011-02-19 15:00:04

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