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vram_blit_ copies a 1-bpp rectangle from RAM to VRAM. The manual has no L,L variant, so the destination is XY and the hardware forms the address: B0=SADDR B1=SPTCH B2=DADDR(XY) B3=DPTCH=0x800 B4=OFFSET=0x04000000 B7=DYDX PSIZE=1 PMASK=0 CONVSP=CONVDP=0x14 CONTROL raster-op=0 SPTCH is a parameter because 0 makes every row read the same source address, which is how one expanded row can be stamped eight times down the screen. The .bss region in the linker command grows from 0x40000 to 0x200000 address units (32 KB -> 256 KB) so a 1280x1024 1-bpp frame buffer (163840 B) fits; the previous .coff had been built from sources that were not yet committed. bench-sweep.sh gains its executable bit.