To: 999 (all members) From: K5B (David J.MacGraw) Subject: 512 and DOS+ Before launching into my own collectionof tips and the like for enhancing the performance of the 512, a cautionary note based on experience! Some of them involve editing files/sectors at byte level; always try them first on floppy backups, NOT your master copies on hardor work disc! They have been determinedsolely by trial and error on 3 systems using Master 128's as host, DOS+ v2.1, expanded memory (ES), twin 5¼" floppiesand a 20M Morley hard disk, ½ for DOS, ½ for ADFS. They are offered in good faith and will, I hope, inspire others to experiment further and report their results, problems etc. via 8BS. Some improvement in booting-up and fileaccess times can be obtained simply by re-organising the files on your discs. Deleting, copying and editing programs causes files to become 'fragmented' andconsecutive portions of programs can bephysically placed anywhere on the disc.This increases loading time because theread/write head must jump about to findeach file's next sequential section. Booting from floppy unfortunately meansusing ADFS 640K disks (as the DOS isn'tyet installed) which, as all access is then routed via the ADFS, is not very quick (33 seconds on my system).
TIP: Deleting 'LOGO.SYS' (the Digital Research logo display) and shuffling up'DOSPLUS.SYS' and 'COMMAND.COM' to fillthe gap speeds bootup slightly. Examineand run the accompanying 'NOLOGO' batchfile on a 512 Disc 1 copy to try it.
BETTER TIP: Install the FastBoot swram by Essential Software. This boots DOS+ using an 800K disc in about 14 seconds.
EVEN BETTER: Use a Winchester hard diskwhich, although still using the ADFS, sets up DOS+ in under 10 seconds.
TIP: When using a 640K floppy, only useit for booting DOS+ (ie.only 6502.SYS, DOSPLUS.SYS and COMMAND.COM are needed,in that order). Copy all the utilities that you need (plus COMMAND.COM) from the 640K boot disk to an 800K type as this format is accessed the quickest. If you need an AUTOEXEC.BAT file, put that on the 800K disc as well and call it AUTO.BAT (reasons to follow later).
TIP: For back ups (you do, don't you?) always use blank 800K discs and create the sub-directory structure first, thenCOPY the files into them starting with those used most often (wildcards help).This process re-constitutes every file onto contiguous areas of what is now a new work disc, enhancing use next time.With hard disks, file fragmentation is not so apparent; however, the above tipis still relevant for backing up and/orarchiving and produces a speedier load if files are copied back to a 'cleaned-out' drive. This necessitates deleting everything except 6502.SYS, DOSPLUS.SYSand COMMAND.COM (which, in that order, should be the first files on the drive)re-creating the directory structure andCOPYing back all files, oft-used first.With large Winchesters this is a major job but is worth doing occasionally andkeeps each file in consecutive sectionswhich helps if recovery is ever needed.Whilst the above is probably 'old-hat' to most 512 users, it bears repetition if only to remind us all of the basics.Having booted DOS+, the 512 environmentcan be 'primed' to automatically set upand run a program by using an AUTOEXEC batch file. More on this next time withsome byte-level editing suggestions to enhance your 512. PS. Why not send in your DOS+ tips etc?8BS may well be the last vestige for us512 users to exchange our ideas.