Posted By
Chicken
on 2016-03-01
17:22:46
 |  Re: PROJECT 64?
Hi SVS,
just to confirm and clarify what's been said before …
"Project64" is not only a Nintendo N64 emulator but also a CBM knowledge base. There's a document on plus/4 there which includes the erroneous $ff07 description (taken from the source mentioned by JamesC):
http://project64.c64.org/hw/plus4maps.txt
Scroll down to "Graphics Chip Register Map"
… and you'll find this:
"$FF07 65287 …
5 Flashing: 0 = yes, 1 = no"
gerliczer linked to a document which is based on various sources – one of them is "Project64". Since the information is contradictory to what other sources say, both descriptions for that bit are mentioned.
There's a similar situation for $ff11 in that document:
"Bit0-3 Volume. Maximum value is 8. //OR:// 0=Off, F=Highest"
Anyway, "PROJECT64" just refers to the "PROJECT64" documentation. It's not some magic hardware 
Back to the FREEZE bit … In the description it says
"TED stop. If set, the TED stops it's counters and screen-generating, only single clock and refresh cycles remain."
I'm not 100% sure about the refresh cycles because I experienced (if I recall correctly) something different, i. e. memory corruption. Can anybody confirm this on real hardware?
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