sajima@cunixc.cc.columbia.edu (Takahiro Sajima) (04/28/89)
I'm posting for a friend, please reply to him at cmm1@cunixa.cc.columbia.edu --------------------------------------------------- Does anyone out there in Netland know how I can set my drive seek rate to 2ms and turn the write verify off? I used to use a program called Schizo (1.3) to do this, but I would rather have a few lines of code in my AUTO folder take care of it so I can save the 20K of memory. This will also help out a friend of mine who reports that Shizo.acc does not work with the version of TOS 1.4 that was supplied in his developer's kit. (Well, it works except for the seek rate changer). Also, is this worth my time/energy? Friends have informed me that changing the seek rate to 2ms will speed up disk I/O. Is this true? Any information would be greatly appreciated. If you want to reply to me directly, I am: cmm1@cunixa.cc.columbia.edu. This message is being forwarded for me so please don't reply to the account it came from. Thanks in advance. Chris (just when you thought you were smarter than the machine) Mauritz cmm1@cunixa.cc.columbia.edu
schmidt@fbihh.UUCP (Jens Schmidt) (05/05/89)
In article <1454@cunixc.cc.columbia.edu>, sajima@cunixc.cc.columbia.edu (Takahiro Sajima) writes: > Does anyone out there in Netland know how I can set my drive seek rate > to 2ms and turn the write verify off? I used to use a program called > Schizo (1.3) ... does not work with TOS 1.4 ... For write verification off, see the system variables in the dev. docs. For the steprate, I found a new XBIOS function no. 41 in TOS 1.4 that Atari never documented (at least I never saw anything in the release notes 8-). C use: #define Steprate(drive,rate) XBIOS(41,drive,rate) Pascal use: FUNCTION steprate (drive, rate: INTEGER): INTEGER; XBIOS (41); All parameters are 16 bits, drive is either 0 or 1 for drive A: or B:, rate is 0 (6ms), 1 (12ms), 2 (2ms), or 3 (3ms). The returned value is the previous setting. Like all over XBIOS, -1 for drive just returns the old value without changing anything. A warning to all: verification is not there for itself, even high quality disks sometimes fail! I'd switch it off only for disks so worthless that I don't bother to use them. Using 2ms with drives that can't handle that causes a SLOWDOWN because of retries.