prindle@nadc (06/30/86)
From: prindle@NADC One very popular, and very handy, CP/M utility for the 128 is Von Ertwine's "C1571", which promises and delivers accelerated writes to 1571 disk files by eliminating a redundant verify done by the CP/M BIOS after each disk sector write (redundant in the sense that the 1571 already is doing an internal verify anyway). Consequently, I was tempted to execute this in my PROFILE.SUB at boot up. However, I just noticed an undesirable, and somewhat unexplainable, side effect of this program: once it has been run against a drive, that drive will no longer read MFM formatted diskettes (well, I tried IBM, OSBORNE, and KAYPRO IV, and they all failed). The system just hangs after a sector or two have been read, and the keyboard scan stops (no more keyclicks); a reboot is necessary. I hope this can be fixed and the program will be re-issued along with the "new-new-new" CP/M 3.0 release which has been announced. Frank Prindle Prindle@NADC.arpa
fred@cbmvax.cbm.UUCP (Fred Bowen) (07/09/86)
> From: prindle@NADC > > One very popular, and very handy, CP/M utility for the 128 is Von Ertwine's > "C1571", which promises and delivers accelerated writes to 1571 disk files by > eliminating a redundant verify done by the CP/M BIOS after each disk sector > write (redundant in the sense that the 1571 already is doing an internal > verify anyway). Consequently, I was tempted to execute this in my PROFILE.SUB > at boot up. Partly correct. The BIOS does not perform any verifies- it is (and always has been) the 1571's job to do this. The speed-up comes from the elimination of most of the drive's retrys-on-error. C1571 does not alter the BIOS. > However, I just noticed an undesirable, and somewhat unexplainable, side effect > of this program: once it has been run against a drive, that drive will no longer > read MFM formatted diskettes (well, I tried IBM, OSBORNE, and KAYPRO IV, and > they all failed). The system just hangs after a sector or two have been read, > and the keyboard scan stops (no more keyclicks); a reboot is necessary. I hope > this can be fixed and the program will be re-issued along with the "new-new-new" > CP/M 3.0 release which has been announced. > > Frank Prindle > Prindle@NADC.arpa The first releases of C1571 were a kludge that did eclipse CP/M's MFM capability. The culprit was a bit of 'patch' code that was placed over the MFM wedges in the 1571 DOS- undesirable indeed. The latest releases have in fact corrected this. Versions of this updated utility are available via Compuserve. I am trying to confirm that the latest version is also on the current CP/M release (who knows what all falls through the cracks these days!). -- Fred Bowen uucp: {ihnp4|seismo|caip}!cbmvax!fred arpa: cbmvax!fred@seismo.CSS.GOV tele: 215 431-9100 Commodore Electronics, Ltd., 1200 Wilson Drive, West Chester, PA, 19380
alford@ecsvax.UUCP (Ross Alford) (07/11/86)
In article <501@cbmvax.cbmvax.cbm.UUCP> fred@cbmvax.UUCP (Fred Bowen) writes: >The first releases of C1571 were a kludge that did eclipse CP/M's MFM >capability. The culprit was a bit of 'patch' code that was placed over the >MFM wedges in the 1571 DOS- undesirable indeed. The latest releases have >in fact corrected this. Versions of this updated utility are available via -------------------------------------------------- >Compuserve.... ---------- Are you sure about this? I just downloaded the C1571 utility from Compuserve, in the special C128 CPM updates area, on or about 1 July. The version I got shows the same behavior described by Frank Prindle...it causes everything to lock up just after pressing return after the KayPro IV message is displayed. At the same time, I downloaded the NEWSYS.COM (or whatever it's called) program, and discovered to my disappointment that it is still the 6 December 1985 version, despite the fact that I am sure I recall that someone from cbmvax announced that a new, 'final' release of CP/M is available a short while ago. On that note, how *will* that release be distributed? It would be nice if you could update the files on CIS. Ross Alford ...mcnc!ecsvax!alford
fred@cbmvax.UUCP (07/11/86)
> In article <501@cbmvax.cbmvax.cbm.UUCP> fred@cbmvax.UUCP (Fred Bowen) writes: > >Versions of this updated utility are available via Compuserve... > ---------------------------------------------------------------- > Are you sure about this? I just downloaded the C1571 utility from Compuserve, > in the special C128 CPM updates area, on or about 1 July. The version I > got shows the same behavior described by Frank Prindle...it causes > everything to lock up just after pressing return after the KayPro IV > message is displayed. At the same time, I downloaded the NEWSYS.COM > (or whatever it's called) program, and discovered to my disappointment > that it is still the 6 December 1985 version, despite the fact that I..... > > Ross Alford > ...mcnc!ecsvax!alford Sorry for the confusion- but we are both right. There are TWO areas on CIS where 'update' 128 CP/M material was placed, and you found the wrong one. The honest-to-gosh latest material is in the CPM SIG (area 3 I think). The latest C1571.COM displays a date of 24FEB86, and is the one of which I spoke. I have not personally been on Compuserve for a long time- but will try to straighten out the differences if I can... The 06DEC85 and 08DEC85 versions of CP/M are virtually identical, and they *do* represent the lastest released versions of CP/M. NEWSYS.COM will create the 06DEC85 version for you- there is no other version of NEWSYS.COM, and I do not see any more changes at this time. Of course there is the option of getting the latest CP/M system via the mail-in card from the manual... -- Fred Bowen uucp: {ihnp4|seismo|caip}!cbmvax!fred arpa: cbmvax!fred@seismo.CSS.GOV tele: 215 431-9100 Commodore Electronics, Ltd., 1200 Wilson Drive, West Chester, PA, 19380