Subject: [stella] Playfield Byte Mapping Patterns? From: "Mark Graybill" <saundby@xxxxxxxxxxxx> Date: Sat, 28 Sep 2002 18:01:42 -0700 |
Hello, all. This is my first post to the list. Something I appear to be seeing that isn't reflected in the Stella Programmer's Guide as far as I can tell is that PF2 appears to get mapped left to right from bit 0 to bit 7, as opposed to from bit 7 to bit 0 as is the case with PF1. This is with the playfield reflection bit in CTRLPF cleared so the PF bytes are mapped as PF0-PF1-PF2-PF0-PF1-PF2. I saw this behavior both with the StellaX emulator and my 7800 with an EPROM loaded with my code. I didn't see anything that seems to control whether it gets mapped from lowest bit to highest or highest bit to lowest. So, my questions are: Is this the expected behavior? Is there a way of making PF2 map the other way around, or do I need just work with it as-is and mirror the bit pattern? Thanks, Mark ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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