Amiga 500's and Ram expansions

sneeker · 14 July 2012, 22:52

I have a 500 and 500+, the 500 has a 4mb trapdoor expansion, tried to fit this to the 500+ earlier instead of the 512k expansion the 500+ came with.

Are the connectors differant, they look the same, but I cant seem to push the 4mb expansion into the 500+? I even took it to pieces to save doing it through the trapdoor, but it still doesnt seem to want to fit?

Chris

duga · 14 July 2012, 22:58

They should be the same.

But, 4 MB in the trapdoor?

johnim · 14 July 2012, 23:04

http://www.commodore.ca/history/comp...a500_board.jpg

hi fastram fits in the leftside

chipram in the trapdoor

sneeker · 14 July 2012, 23:10

4mb in the trapdoor, cant seem to find any mention of it on the internet as theres not much in the way of markings, just a lot of chips...

Of course, Im only assuming its 4mb as it says 4mb next to the switch at the bottom, The jumpers say chip ram and memory respectivley.

Having counted all the chips, it might be 8mb, each chip is a gb71c4256a-80? 256k chips? and theres 32 of them.

johnim · 14 July 2012, 23:13

never seen that before

all amigas can only have 2mb chip total

any name date on it

Jope · 14 July 2012, 23:16

You'll need a daughter board under the GARY chip to access more than 512k of that. It probably plugs into the red connector.

Zetr0 · 14 July 2012, 23:25

Physically it will fit, but you are missing some cables and a small daughter board for the GARY chip.

That looks like a BaseBoard + 4

can you get a better picture of any writing on the card, I will be able to help further.

sneeker · 14 July 2012, 23:45

Nope, only markings on it are vn76 rev 1. Thge amiga using kick 1.3 and has a red power light....

Cable is plugged in and disappears inside someone on my 500 which Im guessing was plugged in, ive not opened this one yet.

Very strange, avail in workbench gives..

512k chip
1.5mb fast...
Thats the most I can get the amiga to see with it fitted, no matter what the jumpers are set to...

I might open this 500 up tomorrow and try this ram upgrade on my 500+

Jope · 15 July 2012, 14:44

You'll need to add the rest with an addmem command. Hope you can find more info somewhere.

I'd advise against connecting it to the A500+ before you have located a manual.

14 July 2012, 22:52	#1
sneeker Registered User Join Date: Mar 2008 Location: Manchester! Posts: 308	Amiga 500's and Ram expansions I have a 500 and 500+, the 500 has a 4mb trapdoor expansion, tried to fit this to the 500+ earlier instead of the 512k expansion the 500+ came with. Are the connectors differant, they look the same, but I cant seem to push the 4mb expansion into the 500+? I even took it to pieces to save doing it through the trapdoor, but it still doesnt seem to want to fit? Chris

14 July 2012, 23:04	#3
johnim Amibay Mod/Staff Join Date: Jun 2010 Location: birmingham uk Age: 48 Posts: 1,019	http://www.commodore.ca/history/comp...a500_board.jpg hi fastram fits in the leftside chipram in the trapdoor Last edited by johnim; 14 July 2012 at 23:12.

14 July 2012, 23:10	#4
sneeker Registered User Join Date: Mar 2008 Location: Manchester! Posts: 308	4mb in the trapdoor, cant seem to find any mention of it on the internet as theres not much in the way of markings, just a lot of chips... Of course, Im only assuming its 4mb as it says 4mb next to the switch at the bottom, The jumpers say chip ram and memory respectivley. Having counted all the chips, it might be 8mb, each chip is a gb71c4256a-80? 256k chips? and theres 32 of them. Last edited by sneeker; 14 July 2012 at 23:16.

14 July 2012, 23:45	#8
sneeker Registered User Join Date: Mar 2008 Location: Manchester! Posts: 308	Nope, only markings on it are vn76 rev 1. Thge amiga using kick 1.3 and has a red power light.... Cable is plugged in and disappears inside someone on my 500 which Im guessing was plugged in, ive not opened this one yet. Very strange, avail in workbench gives.. 512k chip 1.5mb fast... Thats the most I can get the amiga to see with it fitted, no matter what the jumpers are set to... I might open this 500 up tomorrow and try this ram upgrade on my 500+ Last edited by sneeker; 14 July 2012 at 23:56.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Various A4000/Zorro parts for trade - A1200/RAM expansions wanted	Yod@	Swapshop	41	13 April 2010 03:42
Amiga 500 RAM Expansions	Lorfarius	support.Hardware	17	17 March 2010 12:50
WTB A500 Fast Ram Expansions	mfletcher	MarketPlace	2	05 July 2008 13:08
A500 512k ram expansions...	Paul_s	MarketPlace	0	13 October 2007 21:27
A2000 ram expansions	Smiley	MarketPlace	0	25 April 2006 21:34

14 July 2012, 22:58	#2
duga Registered User Join Date: Nov 2010 Location: Sweden Posts: 528	They should be the same. But, 4 MB in the trapdoor?

14 July 2012, 23:13	#5
johnim Amibay Mod/Staff Join Date: Jun 2010 Location: birmingham uk Age: 48 Posts: 1,019	never seen that before all amigas can only have 2mb chip total any name date on it

14 July 2012, 23:16	#6
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	You'll need a daughter board under the GARY chip to access more than 512k of that. It probably plugs into the red connector.

14 July 2012, 23:25	#7
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	Physically it will fit, but you are missing some cables and a small daughter board for the GARY chip. That looks like a BaseBoard + 4 can you get a better picture of any writing on the card, I will be able to help further.

15 July 2012, 14:44	#9
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	You'll need to add the rest with an addmem command. Hope you can find more info somewhere. I'd advise against connecting it to the A500+ before you have located a manual.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)