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Old 27 May 2020, 13:43   #1
Vipersan
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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
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Last edited by Vipersan; 27 May 2020 at 15:24.
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Old 28 May 2020, 06:54   #2
Jope
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Brand name dual wipe sockets are also totally fine. 3M makes a good part.

https://www.mouser.fi/ProductDetail/...8hrvu2KA%3D%3D
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Old 28 May 2020, 11:43   #3
Vipersan
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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.
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Old 29 May 2020, 14:18   #4
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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
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Old 04 June 2020, 20:16   #5
Vipersan
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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
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Old 05 June 2020, 15:47   #6
Vipersan
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Quote:
Originally Posted by Daedalus View Post
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
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Old 05 June 2020, 18:12   #7
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and 48 pin are availlable?
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Old 07 June 2020, 13:08   #8
Vipersan
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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
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Old 08 June 2020, 11:22   #9
Daedalus
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Originally Posted by cpiac64 View Post
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.
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