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The harness forced the VR150 monitor switch, so the firmware wrote the OS screen at 1024 px / 128-byte rows. VT1200_VRAM_REAL then re-read that framebuffer at the VR319 pitch, which sheared the OS and wrapped the right quarter of every row. Model VR319 (switch 0x60) by default -- the real unit's mode -- so the firmware itself programs 1280x1024 with a 256-byte row pitch (CONVDP=0x14). The renderer's pitch follows VT1200_MONITOR, and the destination span now comes from HEBLNK..HSBLNK instead of x=0, placing the active 1280 px at x=336 in MAME's 1696-wide raster. Verified: clean Terminal Manager at frame 600, legible faithful diagnostics menu and level-1 error screens, tile mode PASS with tile_check 1280/1280 tiles, tablet/mouse pixel-identical. VT1200_MONITOR=VR150 reproduces the old geometry; the regression baseline moves 198 -> 199 (2 PCs) and is recorded in harness/mame/README.md.