home *** CD-ROM | disk | FTP | other *** search
-
- If you have trouble with that your comp does'nt find your HD or CD at
- first startup = you just get the bootscreen in your face, and you have
- to do a reset to get it up and runnin',..
-
- This is not only annoying, if you for instance have a BBS on that
- machine, it simply wont start again in case of a brownout, totally
- unacceptable IMHO.
-
- Well, you could buy 3.1 ROMs to make it work, ( 3.1 gives a little more
- time to the drives to get ready ) OR, you can build this little hack.
- Its quite easy to build with a few common components.
-
- How does it work then ?
- Well,.. it simply holds your Amiga in "resetmode" for a short time,
- a few (adjustable) secs to give time to the drives to get ready.
-
- Note that in some cases you also have to cut the first lead
- ( usually red ) in the IDE-cable because some drives wont spin up as
- long as the comp is in "resetmode".
-
-
- Component list: IC = 4093
- C1 = 100nf
- C2 = 10-22uf (pref. tantal.)
- R1 = 10k
- R2 = 10k
- R3 = trimpot. about 470k-1m
- T1 = BC547b or equal.
-
- Plus one IC-socket and a piece of "experimental-board" or similar.
-
- When you have put it together, you can check if it works OK before
- plugging it into the comp. Simply connect a volt-meter between +5
- and reset, and then give it some power ( 3x1.5 V batteries will do )
- After a short time, the V-meter should drop to zero. Adjust the time
- with R3, about 4-5 secs should be enough.
- ( If necessary, you can change values of C2 and/or R3 )
-
- You have to make three connections in your computer:
- Ground and +5V, which you for instance can get from the powercable to
- the Discdrive. And then its the reset signal, which could be found
- ( in the A 1200 ) in the internal trapdoor slot, pin 128,
- or at the Key MPU, pin 38 ( see pic ).
- Its a little tricky to connect the reset, but if you use a thin cable
- and a small solder iron, it's a piece of cake.
-
- Maybe you already converted your A1200 to a tower, and made the
- "keyboard hack", in this case you have all the necessary wires in your
- keyboard, then if you make this thing small you can place it inside
- the keyboard case. nice huh ? :)
-
- Although we have build this, and used it with good results, we do
- _not_ take any responsibilities if you fry your comp.
-
- Have phun, and enjoy your AMIGA !
-
-
- Author: Agne Ragnarsson / drpepper@algonet.se / CAFE 500 BBS 2:200/715
-
- Thanx to: Krister Emtweden and Hakan Karlsson 4 peptalk/help.
-