From: utzoo!decvax!ucbvax!C70:info-cpm Newsgroups: fa.info-cpm Title: Morrow controller..more tales Article-I.D.: ucb.1520 Posted: Thu Jul 15 20:19:10 1982 Received: Mon Jul 19 04:33:55 1982 >From Bomberger@Office-2 Thu Jul 15 20:19:01 1982 Well my case where I don't boot the Morrow supplied BIOS is similar to trying to run some other system. I am ,of course, using the software in the ROM as I dont ever read the morrow disk. Any simple boot procedure is possible with any old disk layout since there is no particular dependency built into the controller. However,...The Rom software seems to have a peculiar bug that causes a 1k block of memory beyond the advertized 2k of the controller to become contaminated. I cannot locate anyting in the code to support this assumption that it is the software. It could be a hardware problem but seems to be restricted to the single 1k block of memory immediately above the morrow RAM. Anyone every heard of such a problem with the Morrow?. The interace to the ROM disk routines seems easy enough. To boot a strange system requires only a 128 byte cold boot routine that is loaded into the controller RAM by the BOOT subroutine. The standard entry point for this boot is described in the manual. From then on it is the designer's game Peace and thanks for any help. -------