42 turnpin sockets ..rare ??

Vipersan · 27 May 2020, 13:43

So ..in preperation for the imminent arrival of the 27C800 chips I have on order ..I decided to create a suitable plug in base for my second A500.
The chip will be programmed with 2x kickstarts ...bank selectable using pin 1
A18 ..and using gnd and +5v
However 42 pin IC bases of the turned pin variety are rare as rocking horse dump.
Thus I canabalised a couple of 40 pin sockets and created a removeable sandwich ..which will leave pin 1 and pin 42 (not needed in the original KS socket) overhanging but means I dont have to cut pins on the 27c800.
That way if I want to reprogram the chip later I still have intact pins.
You can see how this was constructed by adding extra pins to a 40 pin socket.
rgds
VS

Jope · 28 May 2020, 06:54

Brand name dual wipe sockets are also totally fine. 3M makes a good part.

https://www.mouser.fi/ProductDetail/...8hrvu2KA%3D%3D

Vipersan · 28 May 2020, 11:43

Thanks Jope ..I'll keep this in mind if I need to construct another..
..and may help anyone else wanting to try the same process.

Daedalus · 29 May 2020, 14:18

Hmmm... First place I checked was RS, and they have them in stock: https://uk.rs-online.com/web/p/dil-sockets/7022795/

Nice improvisation job to be fair

Vipersan · 04 June 2020, 20:16

Well ..the 27c800 eproms finally arrived ...
programmed KS 1.3 into bank 1
KS 3.1 into bank 2 ...then fitted a switch with 1k resistors to gnd and +5v ..so no hard power spikes when the switch is used.
centre pin of the switch to A18 of the isolated pin 1 of the 27c800.
Works great and a cheap-ish and easy dual boot for my unmodded A500.
Nice

Vipersan · 05 June 2020, 15:47

Quote:

Originally Posted by Daedalus

Hmmm... First place I checked was RS, and they have them in stock: https://uk.rs-online.com/web/p/dil-sockets/7022795/

Nice improvisation job to be fair

Thanks for the link Daedalus..
I may well order a few of them ..as I much prefer turned pin sockets to single or even dual wipe sockets.
rgds
VS

cpiac64 · 05 June 2020, 18:12

and 48 pin are availlable?

Vipersan · 07 June 2020, 13:08

Quote:

Originally Posted by cpiac64

and 48 pin are availlable?

Yes ..slow boat from China ..
Received a couple the other day.
https://www.ebay.co.uk/itm/IC-Socket...72.m2749.l2649

Daedalus · 08 June 2020, 11:22

Quote:

Originally Posted by cpiac64

and 48 pin are availlable?

From the same place I linked to: https://uk.rs-online.com/web/p/dil-sockets/7022808/
Available for next-day delivery in the UK, and probably in Italy too.

27 May 2020, 13:43	#1
Vipersan Registered User Join Date: May 2019 Location: Manchester UK Posts: 137	42 turnpin sockets ..rare ?? So ..in preperation for the imminent arrival of the 27C800 chips I have on order ..I decided to create a suitable plug in base for my second A500. The chip will be programmed with 2x kickstarts ...bank selectable using pin 1 A18 ..and using gnd and +5v However 42 pin IC bases of the turned pin variety are rare as rocking horse dump. Thus I canabalised a couple of 40 pin sockets and created a removeable sandwich ..which will leave pin 1 and pin 42 (not needed in the original KS socket) overhanging but means I dont have to cut pins on the 27c800. That way if I want to reprogram the chip later I still have intact pins. You can see how this was constructed by adding extra pins to a 40 pin socket. rgds VS Attached Thumbnails Last edited by Vipersan; 20 April 2024 at 22:33.

04 June 2020, 20:16	#5
Vipersan Registered User Join Date: May 2019 Location: Manchester UK Posts: 137	Well ..the 27c800 eproms finally arrived ... programmed KS 1.3 into bank 1 KS 3.1 into bank 2 ...then fitted a switch with 1k resistors to gnd and +5v ..so no hard power spikes when the switch is used. centre pin of the switch to A18 of the isolated pin 1 of the 27c800. Works great and a cheap-ish and easy dual boot for my unmodded A500. Nice Last edited by Vipersan; 17 April 2024 at 11:10.

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28 May 2020, 06:54	#2
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	Brand name dual wipe sockets are also totally fine. 3M makes a good part. https://www.mouser.fi/ProductDetail/...8hrvu2KA%3D%3D

28 May 2020, 11:43	#3
Vipersan Registered User Join Date: May 2019 Location: Manchester UK Posts: 137	Thanks Jope ..I'll keep this in mind if I need to construct another.. ..and may help anyone else wanting to try the same process.

29 May 2020, 14:18	#4
Daedalus Registered User Join Date: Jun 2009 Location: Dublin, then Glasgow Posts: 6,334	Hmmm... First place I checked was RS, and they have them in stock: https://uk.rs-online.com/web/p/dil-sockets/7022795/ Nice improvisation job to be fair

05 June 2020, 18:12	#7
cpiac64 Registered User Join Date: Apr 2010 Location: Italy Posts: 1,136	and 48 pin are availlable?

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