forked from arti/vt1200
opencode.energia.arti.ee
45110270a7
One PIXBLT B,XY per source row paints the whole screen: DYDX names `stretch` rows and SPTCH = 0 makes each of them read the same packed source row, so the vertical stretch costs no extra CPU work. vram_b.asm carries the primitive (PSIZE=1, CONVSP/CONVDP=0x14, PMASK=0, OFFSET=0x04000000, DPTCH=0x800, raster op 0) plus DINT/EINT thunks; vidstream.c masks interrupts for the burst (spec 8.9), refuses geometry the screen cannot hold, and counts an OS repaint through a sentinel word in the unused right edge of the last screen row (OS_TOUCH, 0x01810220). MAME mode draw injects a 128-row frame (stretch 8 = 1024 screen rows, ruling R3) and dumps the screen; vidstream_check.py compares all 1024 rows against the bytes actually delivered. RED: 0/1024 rows matched. GREEN: 1024/1024, RX_OK=1, OS_TOUCH=0. Fixes a latent harness bug found on the way: `bpclear <address>` takes a breakpoint INDEX, so the idle-loop breakpoint was never cleared; once a burst masked interrupts long enough, its stale action fired again and re-entered main (a second malloc, counters back to 0).