Re: The ultimate UltiMax cartridge

From: Michał Pleban <>
Date: Tue, 22 Oct 2013 16:57:25 +0200
Message-ID: <>
Hello! wrote:

> I assume you mean /EXRAM and not /EXROM?

Yes of course :(

> Did you determine whether your MAX machine matches the schematic from
> Ruud or the reversed engineered one from Donato Travaglini? The ones
> that Steve and I have match the latter and for those, pins 9 & 10 must
> be jumpered for the CIA to get it's select signal.

I have yet to check it, but for now I assume that the latter (Donato)
will be correct.

> How will you initialise the latch when you power on? In my prototype I
> used a 74LS174 which is a hex latch with a master clear tied to the
> reset line. This way bank 0 of the EPROM is always going to be selected
> at reset and it meant I have a reset button which always takes me back
> to the image selection menu.

Yes, of course I forgot to mention that the /CLR input of the latch is
tied to the /RESET line.


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Received on 2013-10-22 15:01:41

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