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26 December 2007, 15:01
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#1 |
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Digital Corruption
Join Date: Jan 2007
Location: Dorrigo/Australia
Age: 60
Posts: 355
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WinUAE handling of ECS:BPLCON1:DOFF flag
Hi Toni, et al.
Would I be correct in assuming that WinUAE merely logs when the ECS:BPLCON1  OFF flag is set, but takes no other action?Only reference I could find was in "blitter.c": ..... if ((bltcon1 & 0x80) && (currprefs.chipset_mask & CSMASK_ECS_AGNUS)) write_log ("warning: ECS BLTCON1 DOFF-bit set\n"); ..... But it doesn't actually appear to turn the "D" channel off? Have you found any software that actually turns this enable bit off? Cheers, Red |
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26 December 2007, 17:12
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#2 |
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WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 49
Posts: 26,574
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None found and it does not switch D-channel off. It "disconnects" Agnus internal D-channel data register, all blitter DMA writes now get "bus noise" (whatever data that was in chip bus previously) written to D-channel's address.
I don't see any practical use for DOFF-bit except for spying bus data without extra hardware 
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