TIFILESVPMYTERM ð» ò»ÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSÊSL Here's some handy information that will allow you to set your desired; head step speeds for MDOS, "h" version 1.23 or 1.50:@ 1) Copy the SYSTEM/SYS file to a floppy disk, and boot up* Birdwell's DISK UTILITIES v. 4.2ÿ@ 2) Go into FILE OPS, and select FIND STRING from the menu9 3) for the search string (Hexadecimal value) enter 0260F000? and press enter. The search will begin on SYSTEM/SYSÿ Birdwell's DISK UTILITIES v. 4.2ÿ: and it will find this string near the end. This6 string should be near another one, 0200E700.D The "7" in this string is the default head step speed whenC the drive does an initialization (it seems that the driveÿ is ALWAYS doing this!)B Change it to zero for buffered step so the second string is 0200E000B Then write the data to the file. Now you have fixed theÿ the drive does an initialization (it seems that the driveÿD slow head step when MDOS is loaded, and you aren't runningC the EPROM (similar fix for the EPROM code, if you can getE your hands on an EPROMMER. Extract the EPROM H11 code, andÿ an initialization (it seems that the driveÿF do this patch, and re-burn a new eprom with the new code for/ a FAST disk reset when you power up.)H 4) the disk reset is done when you hit CTRL-ALT-DEL, or when anyÿH11 code, andÿ an initialization (it seems that the driveÿD GPL or EXEC-loaded program does a system reset. The diskC reset is the noisy "whirr" of the disk head sliding backD to cylinder zero. Now it is FAST! Note--most new drives( can support this. (post-1985)ÿeÿD 5) to change floppy drive speeds from the defaults listed in the HFDC manual:0 a) 1.44 meg, 2ms default to whatever.E -do the same as above, but look for hex string 020403FFÿn support this. (post-1985)ÿeÿ< the "3" in the string is the head step speed.F Change it to whatever you like, but I recommend a valueG of "2"...020402FF will make your 3 1/2" drives quiet, asÿtring 020403FFÿn support this. (post-1985)ÿeÿ> with a western digital 1772-02 chip and SETDSK.G This changes the head step setting to 1ms, instead of 2.J ( tested with TOSHIBA 1.44 meg drives, older and newer models)ÿ0403FFÿn support this. (post-1985)ÿeÿ, b) 720k, 2ms default to whatever.I -same as above, on the same page you find the 020403FF, lookH for a string 02040200. This is the 2ms head step setting.3 change to 02040100 for 1ms head step.ÿ)ÿeÿ/ ( tested with TOSHIBA 720k drives ), c) 360k, 8ms default to whatever.I -I changed mine to 2ms. This is a mitsumi 5 1/4" drive, butJ Olivetti will also work. Some drives can't handle less thanÿÿ)ÿeÿ0 3 ms, so we have to use 4 instead.H On the same page as above, look for 02040400. This is the, 360k, 8ms switch setting line.> for a 4ms head step instead, change to 02040300.ÿle less thanÿÿ)ÿeÿ> for a 2ms head step instead, change to 02040200.F d) be sure to write each sector out to disk (CTRL-W, enter)L f) reboot your newly patched MDOS, and experience quieter drives.ÿ to 02040300.ÿle less thanÿÿ)ÿeÿG g) if your drives do not work, they can't support the fasterC speeds and you are stuck with chatter..change back to previous values.5 Note: Shugart drives shouldn't be changed.ÿe less thanÿÿ)ÿeÿ3 Here is a table of other values you can use:/ value: if 3 1/2": if 5 1/4":. 7 32 ms 64 ms. 6 16 ms 32 ms. 5 8 ms 16 msÿÿ)ÿeÿ. 4 4 ms 8 ms. 3 2 ms 4 ms. 2 1 ms 2 ms. 1 0.5 ms 1 ms. 0 218 us 436 usÿ 16 msÿÿ)ÿeÿIin the table above, locate the "value" column you want, and substitute inJthe hex strings in the SYSTEM/SYS or EPROM file sector where the head stepIstrings are located. Notice that standard Western Digital values are notÿ 436 usÿ 16 msÿÿ)ÿeÿ-supported here (such as 6ms, 3ms, 12ms, etc).CSome fast 6ms drives can operate at 4ms, others can operate at 2ms.;Generally if it is an older 40 track drive, leave it alone.GIf it is an 80 track drive (5 1/4"or 3 1/2" ) change the step speeds toÿÿeÿEoptimize drive noise levels. This also improves drive seek times and$will slightly enhance loading times.HFor booting, you will need to patch the H11 EPROM file in a similar way.GUse and EPROM programmer to read the EPROM, then edit the buffer as youÿGwould edit SYSTEM/SYS (both use the same code segments for step speeds)IThen re-burn your new EPROM with the new values. A good way to test thisIis by doing SYSTEM/SYS first, as many times as necessary to get it right,then do it for the EPROM image.ÿLOnce you have done this, basically you are locked into that format. You canLstill move your dip switches to select the new values, they still select theEtype of drive you have, there is just a different step speed applied.ÿo it for the EPROM image.ÿDWith these changes, your HFDC and GENEVE will more closely match new"technology and faster disk drives. Drives I use:+Hard drives...both with buffered head step.LToshiba 3 1/2" 1.44 meg and 720k (old and new design faceplate)...1 ms step.ÿM image.ÿ%Mitsumi 5 1/4" 360k....4ms head step.PAlso: TEAC 5 1/4" 720k (80 track)...2ms works fine, 1ms possibly will also work.> Public Domain information researched by Michael J Maksimik,3 Chicago TI Users group BBS, 708-862-0182,ÿtep.ÿM image.ÿ> 3-12-2400 baud, MNP 2-5, 8 bits no parity. 24 hours. ( S & T BBS )ÿine, 1ms possibly will also work.> Public Domain information researched by Michael J Maksimik,3 Chicago TI Users group BBS, 708-862-0182,ÿtep.ÿM image.ÿ