| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1965.1 | 5 1/4 drive i/o schematic | HUSKER::PETERSON | | Thu Dec 08 1988 08:09 | 10 |
| if you will send me a self addressed stamped envelope i will be
glad to send you the information that i believe you want.
dave peterson
1307 beaverlake blvd
plattsmouth nebraska
68048
ph#402-235-2790
A.U.O.H. amiga users of the heartland
|
| 1965.2 | something else to do in my copious spare time... | NSSG::SULLIVAN | Steven E. Sullivan | Thu Dec 08 1988 13:47 | 13 |
| Sometime this week I'll package up the schematic and wirelist for the
one I built. with the correct connector it can simply be plugged on
the card edge connector of the 5.25 disk. The component it uses are
2 wire wrap connectors
1 7438 quad 2 input nand (open collector)
1 7474 dual D flip-flop
1 16 pin dip resistor pack to common pin 1.2K
3 16 pin dip sockets
1 small proto board just big enough to hold it all together.
It has been built, installed and works...
-SES
|
| 1965.3 | Thanks | JGO::LOENDERSLOOT | | Fri Dec 09 1988 06:46 | 2 |
| Thanks for the replies, I'm very interested so keep me informed
|
| 1965.4 | here are some | DNEAST::PFISTER_ROB | I cant put *THAT* here..... | Fri Dec 09 1988 14:38 | 232 |
| I think I posted this somewhere else, but here are instructions
for attaching a 5-1/4 to an Amiga. I helped a friend to do this
once, and it worked.
Robb
From: [email protected] (Randy Spencer)
Subject: Hooking an IBM drive to the Amiga
Date: 2 Apr 86 18:07:28 GMT
Apparently-To: info-amiga-from-usenet@RUTGERS
"zipity do da, zipity ay, my oh my, what a wonderful day!"
A while back someone on another net suggested a way to connect
a 5 and 1/4 inch drive to the Amiga, well a friend picked up on
it and designed a circuit board and built the circuit. When he
was done he had a working 5 1/4 drive for the IBM emulator. Since
I have just ordered PC/ET I asked him if I could have a description
of its construction. When he sent it to me I felt that it would
be something of interest to the net. Here than is "How to build
and IBM drive for the Amiga" schematic and all (hope you can
read it). If you have any questions you may contact him or me,
I will hopefully have built one myself soon.
I would be interested in anyone who is working on building an 880k
amiga compatible 5 1/4 " drive. I do however see more practical
use for the 5 1/4" drive to be IBM compatible. Enjoy!
--------------------------------------------
Connecting a standard 5.25" IBM compatable drive to the Amiga
Parts:
DB25 connector (male, ribbon cable type) with pins 13 and 25 cut off
(the pin numbers given from now on will treat it as a DB23 con-
nector, i.e. 1-12 on the top and 13-23 on the bottom-be careful!)
34 pin edge connector for standard disk drives
25 conductor ribbon cable
12 volt power supply at least 1.5 amps
7805 voltage regulator (TO-220 type) for +5 supply from 12 volts
7474 D flip-flop (Commodore uses LS type, but it doesn't seem to
matter)
7438 open collector quad NAND gate
(5) 1K resistors
An IBM compatable disk drive (I used a Qume QT-142 from JDR
Microdevices, $69.95)
You can get everything but the ICs from Radio Shack.
Procedure:
Attach the ribbon cable to the DB23 connector and cut to length.
Cut cable apart so that wires are about 1-1.5 inches long with
about 1/4 inch of the end stripped. (Remember the two end wires
will be pins 13 and 25 of the DB25 connector, which should not
be used.)
Attach the ribbon cable to the 34 pin edge connector as follows:
DB23 34 edge
2 30 Read Data
3-7 1-33 (odd) Ground
13 32 Select Head 1
14 28 Write Protect
15 26 Track 0
16 24 Write Enable
17 22 Write Data
18 20 Stepper Pulse
19 18 Stepper Direction
22 8 Index
I used a 12V power supply and mounted a 5V regulator on the disk drive
itself for the +5V supply. The other connector on the drive is the
power supply input. If unmarked, you can find which pin(s) is ground
by checking for continuity between the alleged ground pin and pin 7
of a 14 pin TTL chip on the board. Pin 14 of a 14 pin TTL chip is +5,
find the +5 input the same way. The remaining input is +12. The motor,
when turning, draws 1 amp from the +12 supply, and the drive draws
about 0.35 amps from the +5 supply (typical values). Power it any way
you like, but make sure it meets these minimal requirements.
Build the circuit given on the schematic, and attach wires (from
Amiga's DB23 connector) 1,8,10, and 21 as shown on diagram.
The outputs of that circuit go to the Drive Enable and Hub Motor
Drive inputs on the disk drive. On my Qume that was pins 16 and
12, respectively. On other drives the Drive Enable might be 12 or 14,
and the Motor Drive 10 or 16. The correct Motor Drive input is the
one that starts the motor spinning when you ground that pin. You
might have to experiment to find the right Drive Enable. (The drive
light will come on when it is grounded, I think).
Notes:
This drive will work ONLY as a 360K IBM drive. It would work as
a standard Amiga drive it it could step past track 40, but it
can't. Perhaps a quad density (like the Teac FD-55F from JDR)
would work, but I don't know if it would function as a standard
IBM drive in emulator mode.
If you want to hook up another drive, build the identical circuit
but use the SEL2B line instead of the SEL1B line. Commodore
"steps down" drive lines as they go through each drive, i.e.
SEL2B becomes SEL1B and SEL3B becomes SEL2B at the output of the
external drive. So when you make this drive SEL1B, the computer
addresses it as df1: if it is hooked up to the disk port on the
back of the Amiga, and df2: if it is hooked up to the port on the
back of the external drive.
The CHNG line (pin 11) is unused in IBM mode. If you try a quad
density drive and want to use it as a normal Amiga drive, then
hook up a switch to ground (?) this line when a disk is removed.
If the IBM drive is plugged in, the drive's power MUST be on.
If the power is off, the system will not boot because it can't
read any of the drives properly. If the Amiga's up and running
and the drive is turned off, the next time the Amiga tries to
read any disk in any drive it will corrupt that disk (I lost
a couple this way before I realized the problem.) So when you
first test your new drive, set the write protects on your
Kickstart and Workbench disks to prevent damage. After that,
keep the power on or unplug the drive from the Amiga when not
in use.
I lifted the schematic directly from Commodore's 3.5 inch Amiga
drives. I take no credit for it (I'm still not sure what it does)
and I'm not making any money from it, so please don't sue me.
If you have any questions or need help, send mail to me at:
Fred Hamilton
511 Warren St., Apt. 16
Blacksburg, VA 24060
Good Luck!
Schematic:
---------
+++++++++++++++++++++++++ (A)
+ |
Symbols: + | 4
------- resistor: + o---|\ 6
______ + | | |O------
! ! | + o---|/
! chip ! \ + 5
!______! / +
\ + (A)
NAND gate: | + |
+ |
-----|\ + o-----o-----o-----o
| |O---- + | | | |
-----|/ + ____|_____|_____|_____|______
+ ! !
junction no-junction + ! 10 11 12 13 ! 8
+ ! Q !-----
| | + ! !
--o-- --|-- + ! 1/2 7474 _ !
| | + ! Q !-----
+ ! ! 9
+++++++++++++++++++++++++ !_____________________________!
+5v +5v +5v NAND gates are 7438
^ ^ ^ All resistors 1K
| | |
\ \ \ +++++++++++++++++++
1K / (A) 1K / 1K / + From disk drive +
\ ^ \ \ + power supply: +
| | | 1 | + +
| o--------o------|\ 3 | + Pin 14- +5v +
| | | |O--o + Pin 7- GND +
SEL1B(21) >--o-------------|---o--|/ | +++++++++++++++++++
| | 2 |
| o--------|--------------o
+5v | | |
^ | o----o |
| 1 | 3 | | |
\ __________O_______|__ | |
1K / ! CLR \/! | |
\ ! ! | 9 |
| 2 ! ! o---|\ 8 |
MTRXD(8) >--o---! D ! 5 | |O----o |
! Q !------|/ | |
+5v ! ! 10 | |
^ ! 1/2 7474 ! | |
| ! ! | |
\ ! _ ! 6 | |
1K / ! Q !---o | |
\ ! ! | | o---> DRIVE ENABLE
| 4 ! ! | |
DRESB(10) >--o---O PR ! | 12 |
| !___________________! o----|\ 11 |
| | |O---------> HUB MOTOR DRIVE
o--------------------------------|/ |
13 |
|
RDY(1) <-------------------------------------------o
DDRIVE 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34
DB25 NC NC NC 22 NC ^ NC ^ 19 18 17 16 15 14 2 13 NC
^ | ^ |
| | | |----Qume hub motor drive
| | |
| | |----maybe drive enable
| |
| |----Qume drive enable
|
|----maybe hub motor drive
---------------------------
Usual disclaimers:
If any member of the net is caught or killed, my university will
disavough (sp?) any knowledge of my actions.
Good luck gang!--
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Organization: Computer Science Department, University of Maine
|
| 1965.5 | .4 is ID and motor latch for 3.5 drive | NSSG::SULLIVAN | Steven E. Sullivan | Fri Dec 09 1988 14:56 | 21 |
| re: .4
This design will not work to identify a 5.25 drive to the Amiga
*as a 5.25 drive*. It sends an ID code of all 1's back telling the
Amiga there is a 3.5 880k drive there.
To make the ID code for a 5.25 drive takes both flops in the 7474
and all 4 nand gates in the 7438. The ID code for a 5.25 is
alternating 1's and 0's.
PC Utils will not recognize the 5.25 drive, though amigados will
believe there is a 3.5 out there. Dos-To-Dos ignores all this ID
stuff and just tries to use the drive as described in the user
commands. It WILL work with the .4 circuit.
Also be ware that 5.25 360k drives often have the ready line
strapped out (open) for some reason. Hell if I know why. I have had
to add a jumper to one drive to get it to work. The Amiga does care
about ready even if PC/XT's don't!
-SES
|
| 1965.6 | More info needed | JGO::LOENDERSLOOT | | Mon Dec 12 1988 03:16 | 5 |
| It is the electronics for the ID-code where I'm looking for, I have
the drive hooked up with the 3.5'' schematic and it works with the
MS-DOS emulator fine, but since it is a 360k drive I have problems
to get it work under AMIGA-DOS properly. So if somebody can help
me to explain the working of the additional flipflop.
|
| 1965.7 | isn't it in the mountlist? | DNEAST::PFISTER_ROB | I cant put *THAT* here..... | Mon Dec 12 1988 11:23 | 6 |
| re: .6
I was under the impression that info in the mountlist covered
all that. Or am I missing something?
Robb
|
| 1965.8 | Yet Another 5 1/4" Question | COGMK::SNIDER | | Sat Jan 07 1989 15:42 | 8 |
| I have a couple of external floppies using simular circuit, but
I have a couple of programs that will not work with them. The
programs indicate that there is no disk. I think that it is
due to lack of the disk change. Any thoughts?
Thanks,
-pete
|
| 1965.9 | | TCC::HEFFEL | Pigs and Ponies | Thu May 31 1990 00:57 | 25 |
| Okay, after having read a few of the notes (which I located by doing
"dir/title=flop") regarding Amigas and 5�" floppies, I want to do a sanity
check.
I am the proud owner of a 2000 with 2 3�" floppies and 1 3�" hard drive.
At present, I wish to fill the empty 5�" bay with a floppy drive. I do
*not* wish to buy a bridge-board of either variety. (CrossDOS and MSH suit
my needs just fine.) All I want is a 360K drive that AmigaDOS can find and
read, which I can then mount under MSH.
The way I see it I have precious few choices: Pay through the nose for an
external drive (either C='s or a 3rd party drive), cobble together a
home-made board (I am all thumbs with a soldering iron), or buy a
bridge-board (which I can ill afford to do).
Am I missing anything? I surely would rather spend $70 on a "standard"
drive as opposed to spending $200 for an overpriced external, or $400 for
the XT bridge-board.
Anyone have one of those old C= drives (1020, was it?) to sell? You can
even keep the Transformer software. :-)
-Gary
|
| 1965.10 | | LEDS::ACCIARDI | Larger than life, and twice as ugly | Thu May 31 1990 08:12 | 7 |
|
I went through the same exercise as you Gary, and ended up with an
external CBM 1020 drive. The _looks_ like there is enough room in the
A2000 lower bay for the bare drive mechanism and CBM's adaptor board,
but I stopped short of trying to jam them in there.
Ed.
|
| 1965.11 | Check out Take-5... | FROCKY::BALZER | Christian Balzer DTN:785-1029 | Thu May 31 1990 08:38 | 22 |
| Re: .9
Well, I assume you have read note 2878.*. Otherwise do so now. Back? OK! ;-)
The added value of this route is obvious, you get a MS-DOS (MSH) drive AND
an Amiga drive alternativly. Using CrossDOS, you can even leave the drive
in 3.5"/80tracks mode, since you can specify a software double-step mode.
Try to find an experienced hardware hacker, if you feel uncomfortable to put
that sucker together.
BTW, the Software Brewery archive has moved to a concealed device on FRSMIC::
So to get the Take-5 schematic in IFF-ILBM format, copy it from
FRSMIC::Brewery:[take5]Take-5.final
Do a "$Dir FRSMIC::Brewery:[000000]" to see what's available.
There is also an Amiga: device at Frsmic::, but it's currently empty.
Regards,
<CB>
|
| 1965.12 | Can't copy Take-5.final file | ANNECY::LIEBAERT_F | | Thu Nov 21 1991 05:41 | 41 |
| Hello,
I get an error when trying to copy the file described in .11
and Kermit does not like it!
hereafter the ANAL/RMS I have run on the copied file
Than you for your help,
Francis.
FILE HEADER
File Spec: USR$CSSE:[LIEBAERT_F.KERMIT]TAKE-5.FINAL;1
File ID: (9162,70,0)
Owner UIC: [CSSE,LIEBAERT_F]
Protection: System: RW, Owner: RWED, Group: RWE, World: RW
Creation Date: 12-SEP-1989 09:40:00.00
Revision Date: 21-NOV-1991 11:30:07.52, Number: 5
Expiration Date: 30-DEC-1995 11:30:12.46
Backup Date: none posted
Contiguity Options: none
Performance Options: none
Reliability Options: none
Journaling Enabled: none
RMS FILE ATTRIBUTES
File Organization: sequential
Record Format: stream-LF
Record Attributes: carriage-return
Maximum Record Size: 0
Longest Record: 0
Blocks Allocated: 51, Default Extend Size: 0
End-of-File VBN: 49, Offset: %X'0052'
File Monitoring: disabled
Global Buffer Count: 0
*** VBN 48: Last stream record does not contain a delimiter.
Unrecoverable error encountered in structure of file.
The analysis uncovered 2 errors.
|
| 1965.13 | Just transfer it... | FROCKY::BALZER | Christian Balzer DTN:785-1029 | Thu Nov 21 1991 11:28 | 20 |
| Re: .12
> Hello,
>
> I get an error when trying to copy the file described in .11
> and Kermit does not like it!
> hereafter the ANAL/RMS I have run on the copied file
> Than you for your help,
> Francis.
The file on FRSMIC:: is in perfect health, that RMS doesn't like it
doesn't matter, transfer it to your Amiga and it can be displayed.
Use ZModem or check the other notes on Downloading with Kermit, you might
have to use CVTARC...
Cheers,
<CB>
|