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Author Topic: BVision display of 15KHz screens  (Read 2190 times)

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Offline motorollinTopic starter

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BVision display of 15KHz screens
« on: October 31, 2008, 11:48:33 AM »
The BVision in the A1200 I'm using seems to display native 15KHz screenmodes. For example, when I'm on the Kickstart screen or the early startup screen, I can see this both on the TV connected to the composite output, and also on the VGA monitor connected to the BVision. How does it do this? Nothing is connected to the custom chips, so where is it getting the 15KHz signal from?

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moto
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10  IT\'S THE FINAL COUNTDOWN
20  FOR C = 1 TO 2
30     DA-NA-NAAAA-NAAAA DA-NA-NA-NA-NAAAA
40     DA-NA-NAAAA-NAAAA DA-NA-NA-NA-NA-NA-NAAAAA
50  NEXT C
60  NA-NA-NAAAA
70  NA-NA NA-NA-NA-NA-NAAAA NAAA-NAAAAAAAAAAA
80  GOTO 10
 

Offline ddniUK

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Re: BVision display of 15KHz screens
« Reply #1 on: October 31, 2008, 12:02:47 PM »
There is a setting in the BPPC boot menu to force 31khz boot screens. Id wager that you have that enabled. Press and hold ESC during boot to check.
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Offline Crumb

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Re: BVision display of 15KHz screens
« Reply #2 on: October 31, 2008, 12:12:50 PM »
@motorollin

afaik the firmware copies the contents of chip memory to the gfx card. It won't show demoscene stuff.
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Offline keropi

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Re: BVision display of 15KHz screens
« Reply #3 on: October 31, 2008, 12:23:18 PM »
yep, it uses the ppc to copy chipmem contents to bvision/g-rex vgas... very handy!
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Offline jj

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Re: BVision display of 15KHz screens
« Reply #4 on: October 31, 2008, 12:29:46 PM »
Yes this feature has been most useful on a few occasions
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Offline motorollinTopic starter

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Re: BVision display of 15KHz screens
« Reply #5 on: October 31, 2008, 02:01:22 PM »
Ahh thanks guys. Very clever!

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moto
Logged
Code: [Select]
10  IT\'S THE FINAL COUNTDOWN
20  FOR C = 1 TO 2
30     DA-NA-NAAAA-NAAAA DA-NA-NA-NA-NAAAA
40     DA-NA-NAAAA-NAAAA DA-NA-NA-NA-NA-NA-NAAAAA
50  NEXT C
60  NA-NA-NAAAA
70  NA-NA NA-NA-NA-NA-NAAAA NAAA-NAAAAAAAAAAA
80  GOTO 10
 
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