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General Category => Amstrad CPC hardware => Topic started by: bjt on 12:16, 14 October 15

Title: X-MEM internal install to 464 with pics
Post by: bjt on 12:16, 14 October 15

First off, thanks to TotO for the X-MEM, it rocks ;D

All you need for this is the X-MEM, a 50-way ribbon cable with a female IDC connector and some means of mounting the X-MEM to the case. I used sticky pads. An easy way to get a ready-made cable is to buy a 50-way internal SCSI cable like this one: NEW! Quad SCSI I/II Cable 0.9m | eBay (http://www.ebay.co.uk/itm/191601125839)


Unfortunately this method will only work with the V3 or cost-down 464 PCBs as the earlier versions don't have the holes by the edge connector.


First step is to clear any holes that came filled with solder from the factory. I used a solder pump for this.


(http://i.imgur.com/gJ8Ur51l.jpg) (http://imgur.com/gJ8Ur51)
(http://i.imgur.com/CAXJ14Nl.jpg) (http://imgur.com/CAXJ14N)


Then prepare the cable by removing the IDC connector from one end. I found that that IDC connector had scored the insulation at the end of the cable so I could strip it to a perfect length for soldering just by pulling the insulation off by hand.
I soldered the row of wires furthest away from the edge connector first, the second row then went much faster as the cable wasn't moving around as much. Nevertheless this part probably took a couple of hours with breaks. Be 100% sure your pins match up before you get too far along :-)


(http://i.imgur.com/ZMRrz5Xl.jpg) (http://imgur.com/ZMRrz5X)
(http://i.imgur.com/gboEG3Fl.jpg) (http://imgur.com/gboEG3F)


After some final multimeter checks the whole lot went back into the case without problems.


(http://i.imgur.com/EpSfKOhl.jpg) (http://imgur.com/EpSfKOh)


It's alive! I was able to flash BASIC 1.1 and I have level music in Hero Quest and speech in Chase HQ, so I guess it's working.


(http://i.imgur.com/x3Opcc5l.jpg) (http://imgur.com/x3Opcc5)


Really chuffed that the green-screen 464 I got as kid now has colour, 128k and a disc drive  :P







Title: Re: X-MEM internal install to 464 with pics
Post by: ||C|-|E|| on 12:32, 14 October 15
It is really cool! Good that the old 464 has lots of free space inside!  :D
Title: Re: X-MEM internal install to 464 with pics
Post by: Kris on 12:49, 14 October 15
Nice integration :)
It must have been a pain to sold all those wires ! :-\
Title: Re: X-MEM internal install to 464 with pics
Post by: Bryce on 13:41, 14 October 15
Nice pics and good tutorial.

Bryce.
Title: Re: X-MEM internal install to 464 with pics
Post by: TFM on 21:42, 14 October 15
IMHO I would keep the 50 pole cable from expansion port shorter. The shorter the better.  :)
Title: Re: X-MEM internal install to 464 with pics
Post by: bjt on 23:44, 14 October 15
Testing going well :-)

(http://i.imgur.com/fEkGUpOl.jpg) (http://imgur.com/fEkGUpO)
(http://i.imgur.com/6n5fADEl.jpg) (http://imgur.com/6n5fADE)
Title: Re: X-MEM internal install to 464 with pics
Post by: ||C|-|E|| on 01:15, 15 October 15
Cool! Look at that 464!  :D
Title: Re: X-MEM internal install to 464 with pics
Post by: Token on 01:29, 15 October 15
Good job! Loved the photo with the 3D bat, the colors..(nice screen)
Title: Re: X-MEM internal install to 464 with pics
Post by: Audronic on 09:31, 15 October 15
@bjt (http://www.cpcwiki.eu/forum/index.php?PHPSESSID=u54m6r1etbrrdlq1aob0qvuo83&?action=profile;u=1364)


"" I found that that IDC connector had scored the insulation at the end of the cable so I could strip it to a perfect length for soldering just by pulling the insulation off by hand.  """
Thanks for the tip.


Well done

Ray
Title: Re: X-MEM internal install to 464 with pics
Post by: ||C|-|E|| on 12:15, 15 October 15
I was thinking that your 464, as it is now, is exactly (more or less) what will be needed to run our text-adventure in an non 6128 machine. Maybe you will be able to give it a try and tell us how it feels!  :D .
Title: Re: X-MEM internal install to 464 with pics
Post by: CPC_Fan on 19:43, 15 October 15
Nice work there bjt. That's an excellent project. Would I be right in saying though, that when you want to alter the X-Mem to boot from ROM or CPC, you have to open up your 464 to change the switch position on the X-Mem?
Title: Re: X-MEM internal install to 464 with pics
Post by: bjt on 20:39, 15 October 15
That's true, although I can't see why I'd need to. I guess it would be easy enough to extend the switch to one mounted on the case.