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25 December 2014, 14:08
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#1 |
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Registered User
Join Date: Jan 2014
Location: St.Gallen / Switzerland
Posts: 84
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What kind of expansion board is that ?
Does somebody know what expansion board this is ? There's no label on it (except the colossus stickers on both sides). Thanks for your help!
 
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25 December 2014, 14:47
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#2 |
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Registered User
Join Date: Oct 2012
Location: Germany
Posts: 585
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Looks like a rebranded 3-state Megamix Zorro 2 Ram expansion.
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26 December 2014, 11:07
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#3 |
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Zone Friend
Join Date: Aug 2002
Location: Belgium
Age: 51
Posts: 1,297
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Remove the stickers, pcb printed reference may be underneath it. But looks like Zorro 2 ram expansion for sure.
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29 December 2014, 14:44
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#4 |
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Registered User
Join Date: Jan 2014
Location: St.Gallen / Switzerland
Posts: 84
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Thanks for the answers. I searched for the chips on the board (HYB514256B-60) and they are indeed memory chips...
How much capacity has one chip when the chip description is as follows: "256 K X 4-bit Dynamic RAM Low Power 256 K X 4-bit Dynamic RAM" Is that the same than 256x4 bit = 1024 bit = 128 kB ? Btw. I removed the two labels named "Colossus", but the imprint underneath was rasped away ... |
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29 December 2014, 15:02
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#5 |
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Registered User
Join Date: May 2010
Location: Helsinki, Finland
Posts: 1,341
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That's correct. Since it has all 16 chips, it has 2 megabytes of RAM installed.
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29 December 2014, 15:51
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#6 |
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Registered User
Join Date: Mar 2004
Location: finland
Posts: 1,841
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I think Colossus was a computer shop in UK.
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29 December 2014, 16:55
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#7 | |
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Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,428
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Quote:
http://amiga.resource.cx/exp/megamix It has 2MB fitted and can take another 6MB to give 8Mbytes total (via six 1Mx8 30-pin SIPP sticks). 1Mx8 SIPP memory modules seem to be quite rare ($15+ each on eBay) but I believe that you can either : 1) Desolder the SIPP socket and fit a 30-pin SIMM socket. 2) Solder a pin-strip to a 30-pin SIMM edge connector. Both practices were widely done to Atari STe / TT which could also come with SIPP Last edited by alexh; 29 December 2014 at 17:02. |
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29 December 2014, 19:45
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#8 |
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-
Join Date: Jul 2003
Location: Helsinki / Finland
Age: 43
Posts: 9,883
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I'd probably go for option 2 with some machined pin strip. :-)
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30 December 2014, 12:30
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#9 |
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Registered User
Join Date: Feb 2014
Location: Maitland / AUSTRALIA
Posts: 205
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Like attached?
 And use machined pins as suggested....the square pins wont fit the machined pin sockets! I bought some pins strips with square pins...lined up perfectly with the simm and socket...but.... 
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30 December 2014, 22:22
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#10 | |
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Da Digger :)
Join Date: Nov 2008
Location: Monza, Italy
Posts: 2,822
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Quote:
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30 December 2014, 23:26
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#11 |
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Alien Breeder
Join Date: Dec 2007
Location: Szigetszentmiklos / Hungary
Age: 46
Posts: 1,109
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yeah, but what? I have this board too
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31 December 2014, 00:52
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#12 | |||
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Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,428
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Quote:
Quote:
Erm... Square peg, round hole guys. They don't fit. You need machine tooled (I.e. round) pins. Like the Voyager_1701e shows in his photo above. Last edited by alexh; 31 December 2014 at 00:58. |
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01 January 2015, 09:29
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#13 | |
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Registered User
Join Date: Feb 2014
Location: Maitland / AUSTRALIA
Posts: 205
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Quote:
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