Turborom and Slow Videos When the Advent TurboROM is installed on a Kaypro (with or without ZCPR3) several new video features are enabled, as detailed in the TurboROM manual, pp. 5-9 and 5-10. The side-effects of one feature are not immediately obvious, so the reasons for using the control sequences in Par. 5.6.1.4 are unclear, as is the manner of implementing them. The TurboROM default, which provides a 24-line scrolling window with a locked 25th line (for clock or status display) has the unintended side-effect of slowing down scrolling, whether through text, or large directories. It also trashes the bottom line display used by some game programs (CLONE is a good example). The file L25.SET is simply a hex string representing the video control code C 7. Using PIP, the command PIP CON:=L25.SET will unlock the 25th line and speed up scrolling. On my K10 it also cleans up the scrolling nicely (much less cursor flashing & will-o'-the-wisp garbage floating across the screen). Of course, this change is not very helpful when you want a locked, real-time clock display line. To switch back to the default locked 25th line, easiest is probably to cold boot (removing the PIP command from any STARTUP alias--since I don't use a clock, I included the unlock sequence in STARTUP for convenience). It's also possible to make an alternate L24.SET by using DDT (or SPZ, or ...) to change location 0101h from 43h [C] to 42h [B]. There's probably a much easier way to handle this, and to access other TurboROM features. Perhaps some assembly-language maven will put together a bells & whistles package. CREDITS: Thanks to Derek McKay of Plu*Perfect Systems for patient explanations of these arcane, and pointing to various possible solutions. TurboROM and its associated code is copyright by Advent Products, Inc. and Plu*Perfect Systems. The ziggurat of ZCPR3 is copyright by Echelon, Inc. Fred Lieberman (N7AX) voice tel. (408) 338-2914 ----------