Is this 2mb or 1mb? (A500+ upgrade)

Mike UK · 21 January 2007, 20:06

Hiya is this a 4mb A500+ upgrade?

Cheers Mike

alexh · 21 January 2007, 20:24

No such thing.

There is only a 1Mbyte A500+ trapdoor expansion (bringing the total to 2Mbyte Chip RAM)

Mike UK · 21 January 2007, 20:30

Thought so seen it on ebay and it was advertised as 4mb lol

just won this
http://cgi.ebay.co.uk/ws/eBayISAPI.d...4924&rd=1&rd=1

Doesnt look like 2mb to me possibly 1mb ill have to see what sims are on it when it arrives what size do you lot think it is?

Cheers

alexh · 21 January 2007, 20:47

There is NO SUCH THING!

There are really only 512Kbyte (A500) and 1Mbyte (A500+) trap door expansions.

To be any larger they would have to clip to the CPU [Edit:] Or the Gary chip

keropi · 21 January 2007, 20:51

so, those are 256kb simms of the auction????

Mike UK · 21 January 2007, 20:51

I know theres a hardware limit.
Although 32 pin sims did come in different capacitys if memory serves me correct. its been a long time since i dealt with them.

Paul_s · 21 January 2007, 20:55

That'll probably be half or a full meg the one you've bought.

Power computing did one's that went upto 4m on the 500/+ although there was a daughter board supplied iirc for Gary.

Out of interest have you checked the onboard battery on the 500+ (you'll need to take it apart as it's located on the actual motherboard)

They are well over due to be replaced (better removed completely imo) (1992 - service life of 6 years) and you don't want it leaking

Just something to bear in mind if you have a 500+.

Mike UK · 21 January 2007, 20:58

Good advice yeah i took the battery out within an hour of owning it luckily it hadnt leaked got one to solder on when i got some time free

alexh · 21 January 2007, 21:00

I've discovered that there are some larger A500 Trapdoor RAM expansions but all of course have to clip to the Gary. Elbox also does one.

@Keropi
There were lots of things that shipped with 256kbyte 30-pin SIMMs (never upgraded an Atari STe have you!) including Marpet's A600 trapdoor expansion.

@Paul_S
I'd like to get a look at the PowerC thing with a clip to the Gary. Unfortunately there are no good pics of it on the net.

keropi · 21 January 2007, 21:00

here it is, Marpet Developments: MP500B
those must be 256kb 30pin simms....

Mike UK · 21 January 2007, 21:05

You found that one quick!

cool hopefully its still got the same simms on board

alexh · 21 January 2007, 21:17

@Paul_S

You are right, there seems to be a lot more of these things that I first thought and they mainly clip to the Gary as you say.

Zetr0 · 21 January 2007, 21:56

I wonder if it is possible to convert one of these to connect to the A600 and Gayle chip ?......

i wonder i wonder i wonder.......

Paul_s · 21 January 2007, 22:41

It makes me wonder if you can fit anymore in that A600 as it is Zetro

Skylight · 21 January 2007, 22:52

Quote:

Originally Posted by Zetr0

I wonder if it is possible to convert one of these to connect to the A600 and Gayle chip ?......

i wonder i wonder i wonder.......

The Gayle is not really comparable with the trusty old Gary address decoder.
Gayle and the Fat Gary from A4000 are containing the IDE controller btw.

Here ist the Gary documentation from Dave Haynie's archive:
http://www.thule.no/haynie/systems/a.../docs/gary.txt

Somewhere i got the Gayle documentation too ...

btw ... every trapdoor memory expansion with more than 1MB must connect to the Gary socket (but never to the CPU) to use the full available address space.

But u can use only about 1.8MB (otherwise u would trash the chipset registers!

)

Ciao, Rick ...

21 January 2007, 20:06	#1
Mike UK Motorollin Join Date: Nov 2006 Location: Huddersfield UK Age: 42 Posts: 249	Is this 2mb or 1mb? (A500+ upgrade) Hiya is this a 4mb A500+ upgrade? Cheers Mike

21 January 2007, 20:30	#3
Mike UK Motorollin Join Date: Nov 2006 Location: Huddersfield UK Age: 42 Posts: 249	Thought so seen it on ebay and it was advertised as 4mb lol just won this http://cgi.ebay.co.uk/ws/eBayISAPI.d...4924&rd=1&rd=1 Doesnt look like 2mb to me possibly 1mb ill have to see what sims are on it when it arrives what size do you lot think it is? Cheers Last edited by Mike UK; 21 January 2007 at 20:43.

21 January 2007, 20:47	#4
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,335	There is NO SUCH THING! There are really only 512Kbyte (A500) and 1Mbyte (A500+) trap door expansions. To be any larger they would have to clip to the CPU [Edit:] Or the Gary chip Last edited by alexh; 21 January 2007 at 21:19.

21 January 2007, 21:00	#9
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,335	I've discovered that there are some larger A500 Trapdoor RAM expansions but all of course have to clip to the Gary. Elbox also does one. @Keropi There were lots of things that shipped with 256kbyte 30-pin SIMMs (never upgraded an Atari STe have you!) including Marpet's A600 trapdoor expansion. @Paul_S I'd like to get a look at the PowerC thing with a clip to the Gary. Unfortunately there are no good pics of it on the net. Last edited by alexh; 21 January 2007 at 21:20.

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21 January 2007, 20:24	#2
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,335	No such thing. There is only a 1Mbyte A500+ trapdoor expansion (bringing the total to 2Mbyte Chip RAM)

21 January 2007, 20:51	#5
keropi . Join Date: Oct 2004 Location: Ioannina/Greece Posts: 5,040	so, those are 256kb simms of the auction????

21 January 2007, 20:55	#7
Paul_s Registered User Join Date: Nov 2006 Location: Amigaville Age: 46 Posts: 3,334	That'll probably be half or a full meg the one you've bought. Power computing did one's that went upto 4m on the 500/+ although there was a daughter board supplied iirc for Gary. Out of interest have you checked the onboard battery on the 500+ (you'll need to take it apart as it's located on the actual motherboard) They are well over due to be replaced (better removed completely imo) (1992 - service life of 6 years) and you don't want it leaking Just something to bear in mind if you have a 500+.

21 January 2007, 20:58	#8
Mike UK Motorollin Join Date: Nov 2006 Location: Huddersfield UK Age: 42 Posts: 249	Good advice yeah i took the battery out within an hour of owning it luckily it hadnt leaked got one to solder on when i got some time free

21 January 2007, 21:05	#11
Mike UK Motorollin Join Date: Nov 2006 Location: Huddersfield UK Age: 42 Posts: 249	You found that one quick! cool hopefully its still got the same simms on board

21 January 2007, 21:17	#12
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,335	@Paul_S You are right, there seems to be a lot more of these things that I first thought and they mainly clip to the Gary as you say.

21 January 2007, 21:56	#13
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	I wonder if it is possible to convert one of these to connect to the A600 and Gayle chip ?...... i wonder i wonder i wonder.......

21 January 2007, 22:41	#14
Paul_s Registered User Join Date: Nov 2006 Location: Amigaville Age: 46 Posts: 3,334	It makes me wonder if you can fit anymore in that A600 as it is Zetro

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