Subject: Re: [stella] Is there an error in the Stella Manual? From: Chris Wilkson <ecwilkso@xxxxxxx> Date: Mon, 7 Sep 1998 21:50:20 -0400 (EDT) |
On Mon, 7 Sep 1998, Chris Cracknell wrote: > I think I might have my clock finished. The sprites are all doing what I > want them to and I just implimented a requested feature. A friend liked the > clock but didn't like the 24 hour format. So I made the B/W switch toggle > between a 12 hour and 24 hour clock. I got it working but I had a hard time > doing it. There seems to be a discepancy between what the Stella manual says > and what my 2600 says. I can't get the 24hr clock to work on stella. But the sprites kick ass!!! Very cool... > In the Stella Manual the data bits for SWCHB says: > > D3 - B/W Switch I don't remember the others, but the bw/color switch is indeed d3. > But here is the code I had to use to read the B/W switch > > joy lda SWCHB > and %0010000 > cmp %0010000 > bne swa > lda HOURS > cmp #$0c > bpl swa > lda #$17 > sta HOURS > > On my 2600 D5 is the B/W switch, D3 is select, and D2 is reset. > > Is there an error in the manual, my code, or is there something odd with > my 2600. Try this to read the bw/color switch: joy lda SWCHB and #08 ; sets the z flag if bit 3 = 0 ; clears it otherwise beq bw ; I forget which is black and white, 0 or 1... :) color ... ... ... This worked in my hacked version of the playfield demo (on PCAE and multiple 2600s). And it matches what the Stella docs say. -Chris -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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