Great Mystery - A1200 Rom Wires?

Peter · 25 February 2009, 13:55

I got hold of another A1200 (MB Rev-1D4) - it certainly has a sun tan - Internally it is in very good condition and although the security seal was broken it doesn't look as though it has been tampered with in any way but I am a bit suspicious about whether the floppy drive is original... have a look...

It is a Mitsumi drive - model D357T2 - it looks like it has it's own exhaust pipe. Were these standard in A1200'S?

Also check out these Rom chips... they look to be sitting on two ROM risers and have little wires soldered onto them... WTF??

I will post some more pictures when I give it a good clean and test...

Predseda · 25 February 2009, 14:03

I have the same in my A1200

It is an original hack because of the earliest ROMs, but I really dont know the exact purpose. As you can see, there is the datecode 9311, which means your ROMs are from the half of March 1993 (I have the same datestamp). Later (I dont know how much later) ROMs are wires - free (I hope virus - free as well

).

alexh · 25 February 2009, 14:12

It is most likely they have the wrong pinout. A mod similar to this is needed when using some EPROMs

Predseda · 25 February 2009, 14:16

My A1200 was originally equipped with panasonic JU-253-043P, though. It had the similar cylinder, but covered with the drive case. I replaced it with Mitsumi though, because the Panasonic drive was a crap.

Peter · 25 February 2009, 20:15

Here are some pictures of the A1200 - it has got a bit of a sun Tan - it looks a bit like the David Dickinson of the Amiga World...

The Motherboard is in perfect condition and I have installed a 4GB IBM IDE drive - it's all working fine - It has had a thorough clean and been on test all day.

Now I have a choice - I might exchange it for an A600 - (A600 now not required but will still trade for an Amiga Specific Monitor) or take an offer or I might ebay it... any interest please PM me... obviously I will be looking for "The Real Deal"

lopos2000 · 25 February 2009, 20:34

Is she cheap as chips?

Peter · 28 February 2009, 21:09

Just thought I would bump this thread back up to generate a bit of interest - if no one is interested I will list this on Ebay early next week... (UK only - Sorry)

Will now exchange for an Amiga specific monitor or a cash offer...

PM to discuss...

11 August 2012, 15:28

sorry for reply to this old thread, but I have the same fix on my board, and I want to know if it's a fix only for the roms or it's for the board also, because I want to upgrade it to 3.1

delshay · 12 August 2012, 12:12

Quote:

Originally Posted by Predseda

My A1200 was originally equipped with panasonic JU-253-043P, though. It had the similar cylinder, but covered with the drive case. I replaced it with Mitsumi though, because the Panasonic drive was a crap.

Mitsumi drive rules. I did a test some years ago not sure if it was head alignment but its performance was above any drive I tested for amiga,it was just the way it reads floppy disk with no back and forth of re-reading protected floppy disk (ie protected floppy games on disk).

Mitsumi drive with built in card reader. Now I use a motorize floppy drive,so my A1200 must be powered up in-order to eject the floppy disk.

delshay · 12 August 2012, 12:53

You will need to know how to modify the floppy drive part in-order for it to work with amiga. Never tested the card reader as I did not have a Subway,but I don't see any reason why it should not work.

Look for drive(s) that have a standard floppy drive interface with card reader.

Happy modding.

http://www.ebay.co.uk/sch/sis.html?_...0CARD%20READER

delshay · 12 August 2012, 14:29

NOTE: some floppy drive do have mounting assembly for the second motor to eject the the floppy disk by electronics,but is very very rare a motor is used. most drive have a mechanical eject button put in place,but a simple check inside the floppy drive you may see some drive already has mounting assembly for the 2nd motor.

Some of you may have this type of floppy drive but don't even know it.

Eject motor

http://www.solarbotics.net/bftgu/tut...mron_hack.html

25 February 2009, 13:55	#1
Peter Still an Amiga user Join Date: Nov 2006 Location: Kent Age: 55 Posts: 2,715	Great Mystery - A1200 Rom Wires? I got hold of another A1200 (MB Rev-1D4) - it certainly has a sun tan - Internally it is in very good condition and although the security seal was broken it doesn't look as though it has been tampered with in any way but I am a bit suspicious about whether the floppy drive is original... have a look... It is a Mitsumi drive - model D357T2 - it looks like it has it's own exhaust pipe. Were these standard in A1200'S? Also check out these Rom chips... they look to be sitting on two ROM risers and have little wires soldered onto them... WTF?? I will post some more pictures when I give it a good clean and test... Last edited by Peter; 25 February 2009 at 20:16.

25 February 2009, 14:03	#2
Predseda Puttymoon inhabitant Join Date: Mar 2007 Location: Tromaville Age: 46 Posts: 7,535	I have the same in my A1200 It is an original hack because of the earliest ROMs, but I really dont know the exact purpose. As you can see, there is the datecode 9311, which means your ROMs are from the half of March 1993 (I have the same datestamp). Later (I dont know how much later) ROMs are wires - free (I hope virus - free as well ). Attached Thumbnails

25 February 2009, 20:15	#5
Peter Still an Amiga user Join Date: Nov 2006 Location: Kent Age: 55 Posts: 2,715	Here are some pictures of the A1200 - it has got a bit of a sun Tan - it looks a bit like the David Dickinson of the Amiga World... The Motherboard is in perfect condition and I have installed a 4GB IBM IDE drive - it's all working fine - It has had a thorough clean and been on test all day. Now I have a choice - I might exchange it for an A600 - (A600 now not required but will still trade for an Amiga Specific Monitor) or take an offer or I might ebay it... any interest please PM me... obviously I will be looking for "The Real Deal" Attached Thumbnails Last edited by Peter; 28 February 2009 at 21:06.

12 August 2012, 12:53	#10
delshay Registered User Join Date: Jan 2011 Location: uk Posts: 245	You will need to know how to modify the floppy drive part in-order for it to work with amiga. Never tested the card reader as I did not have a Subway,but I don't see any reason why it should not work. Look for drive(s) that have a standard floppy drive interface with card reader. Happy modding. http://www.ebay.co.uk/sch/sis.html?_...0CARD%20READER Last edited by delshay; 12 August 2012 at 20:37.

12 August 2012, 14:29	#11
delshay Registered User Join Date: Jan 2011 Location: uk Posts: 245	NOTE: some floppy drive do have mounting assembly for the second motor to eject the the floppy disk by electronics,but is very very rare a motor is used. most drive have a mechanical eject button put in place,but a simple check inside the floppy drive you may see some drive already has mounting assembly for the 2nd motor. Some of you may have this type of floppy drive but don't even know it. Eject motor http://www.solarbotics.net/bftgu/tut...mron_hack.html Last edited by delshay; 12 August 2012 at 20:20.

25 February 2009, 14:12	#3
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,330	It is most likely they have the wrong pinout. A mod similar to this is needed when using some EPROMs

25 February 2009, 14:16	#4
Predseda Puttymoon inhabitant Join Date: Mar 2007 Location: Tromaville Age: 46 Posts: 7,535	My A1200 was originally equipped with panasonic JU-253-043P, though. It had the similar cylinder, but covered with the drive case. I replaced it with Mitsumi though, because the Panasonic drive was a crap.

25 February 2009, 20:34	#6
lopos2000 Zone Friend Join Date: Apr 2005 Location: Cider is best In The West Posts: 1,238	Is she cheap as chips?

28 February 2009, 21:09	#7
Peter Still an Amiga user Join Date: Nov 2006 Location: Kent Age: 55 Posts: 2,715	Just thought I would bump this thread back up to generate a bit of interest - if no one is interested I will list this on Ebay early next week... (UK only - Sorry) Will now exchange for an Amiga specific monitor or a cash offer... PM to discuss...

11 August 2012, 15:28	#8
spacerman Posts: n/a	sorry for reply to this old thread, but I have the same fix on my board, and I want to know if it's a fix only for the roms or it's for the board also, because I want to upgrade it to 3.1

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