Re: Help with SX64 User Port?

From: Mia Magnusson <*mia_at_plea.se*> Date: Wed, 28 Jun 2017 02:44:59 +0200 Message-ID: <20170628024459.00003d3f@plea.se> · mia_at_plea.se

Den Tue, 27 Jun 2017 08:54:41 -0600 skrev Terry Raymond
<traymond20@gmail.com>:
> Hmm I never knew they had their own
> cia I thought they used the C64's own cia.

The 1541 is a rebranded 1540 with some slight changes in the ROM code.

The 1540 were made for VIC-20 and shares the same 6522 VIA:s that
VIC-20 uses.

(PET also uses 6522 but only one, combined with two 6520 which is MOS
Technologies name for a 6820/6821).

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