Re: C64 Cartridge Port Write Timing Issues

From: Jim Brain <>
Date: Mon, 12 Jun 2017 22:05:42 -0500
Message-ID: <>
On 6/12/2017 4:09 PM, earth1dome1 wrote:
> Just reread your post about the ef1 and constraints of it for port 
> writes?
> Is it a timing frequency shift? Could you check that for the ntsc and 
> pal operate on different frequencies not just the TV portion but also 
> the writing and read for external roms and ram carts. Jeremy
I am soldering up a unit here to test on NTSC, but I only have one PAL 
unit to test, so if I can't replicate the issue on NTSC, I am hoping 
this single PAL option will generate the issue.


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Received on 2017-06-13 04:00:03

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