Re: CBM2 v9958 Hires-Color Graphics Card

From: smf <smf_at_null.net>
Date: Thu, 31 Jan 2019 14:55:56 +0000
Message-ID: <5a1485c6-b78e-2c4d-dba1-8c25e22f98f2@null.net> 
On 31/01/2019 08:24, vossi wrote:
> My 6509R4 and the 6509R7 have both this "feature" ;)
> Is this a know bug of the 6509?

I believe all 6502's do a dummy read before a write with STA (zp),Y

With STA $xxxx,Y you only get the dummy read if you cross a page
boundary when adding Y, but it looks like they missed out this
optimation on STA (zp),Y
Received on 2019-01-31 16:00:03

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