Byte (June 1986)
Format: PDF / Kindle (mobi) / ePub
Vol. 11, issue 6.
leamed as you go. And all along, you're acnlally using REFLEX. With the help of FastStal1, even the most inexperienced user can stat1 producing with REFLEX, fast. McGRAW-Hill Itnl. lirlining Systems PO. Box 641, Del Mar, CA 92014 the fast way to learn your software. REfLEX is a tradema rk ofBOR1..\ N[)/Ana1~·1ica Inc. MS·DOS is a registered trademark of Mic rosoft Corporation. dBas(' II , dBasc Ill, and Mu h i~l atc are t radclllark.~ of Ashton·Tatc. Lotus \-2·j and SymphollYarc trademark...,
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first. and then I'll look at a full SCSI implementation . SELECTION PROCESS Since the system contains a single host and th e peripherals are not capable of disconnection and reselection . the host is the on ly bus master and can enter the selection phase without arbitrating. It does this by asserting SEL and the data bit of the device being selected (the disk drive). The peripheral dev ice operating as a bus target asserts BSY to complete the selection process. To accomp li sh this with th e NCR
is a subdirectory. If it is, the program pushes that subdirectory's information onto the stack. After the program processes each directory block, line 210 checks to see if that block is the last block of the current directory. If not. execution loops back to line 120 to read and process the next block; otherwise execution continues with line 220. When program execution reaches 124 BY T E • JUNE 1986 line 220, variable CO contains the number of directory entries stored in NA$, DR$ contains the
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