On 11/17/25 14:11, David Brownlee wrote:
But there is a strange offset to the video. I've attached two pics which show what I mean. See where my pointer has grabbed the window title bar in the second picture; I've actually grabbed the window and am dragging it, so that's where the X server thinks the window is. But the actual displayed objects are shifted to the left.Hmm, sfb_common_init() adds another 4096 to the VRAM address, let's do the same: Index: sfb.c =================================================================== RCS file: /cvsroot/src/sys/dev/tc/sfb.c,v retrieving revision 1.89 diff -u -w -r1.89 sfb.c --- sfb.c 6 Dec 2021 16:00:07 -0000 1.89 +++ sfb.c 17 Nov 2025 10:45:52 -0000 @@ -485,9 +485,9 @@ { struct sfb_softc *sc = v; - if (offset >= SFB_SIZE || offset < 0) + if (offset >= SFB_FB_SIZE || offset < 0) return (-1); - return machine_btop(sc->sc_vaddr + offset); + return machine_btop(sc->sc_vaddr + SFB_FB_OFFSET + 4096 + offset); }Updated builds with the + 4096 at https://sync.absd.org/pmax/ - should only need to update the kernel :)
That's it, it works! Pic attached. Thank you to everyone involved for your input, and especially to Michael and David who did all the legwork.
This -260 is now on permanent public exhibit at the Large Scale Systems Museum in Pittsburgh, dual-booting Ultrix-32 and NetBSD 10.1, for everyone to use and enjoy.
Thanks,
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PAAttachment:
20251117_200623_sm.jpg
Description: JPEG image
