Wanted: Commodore A501+

patrik · 11 July 2009, 04:37

I am looking for a Commodore A501+ 1MB chipmem expansion for the A500+, i.e.
this baby, but preferably with the metal shield intact.

11 July 2009, 14:14

Maybe this is what your looking for ?

http://amigaworld.net/modules/classi...onces&lid=2389

Cheers

John

Zetr0 · 11 July 2009, 19:25

@Drac

the A501 is only a half meg 512KB memory expansion, where as the A501+ is a full meg expansion 1024KB

theres some more info here

11 July 2009, 20:22

I am sorry. My bad

Please accept my apology.

John

bastibs · 11 July 2009, 21:49

He will do.

Zetr0 · 12 July 2009, 02:07

Quote:

Originally Posted by Drac

I am sorry. My bad

Please accept my apology.

John

Its an easy mistake my friend, one I have made myself I am sure on more than one occasion

12 July 2009, 05:01

That's good

I looked at the pcb on the pictures he linked to and it says
512kb ram expansion on middle left side end and ABOH says it's
512kb on the pcb and the cardboardbox

That's why I thought it was the same

Learning something new every day

Is booth A501 and A501+ chipram or fastram expansions ?

...Keller also has a 1 meg expansion called A501plus but it looks different.

patrik · 12 July 2009, 12:28

I guess that for the last revisions of the A501, they made a PCB which could be used for making both the A501 and A501+.

In the A501 incarnation, for the regular A500, it would only have had four ram chips (256kx4 ram chips) and the realtime clock part would have been populated with chips and battery.

They are both chipmem expansions, but on many A500's, the Agnus chip will only address 512kB chipmem and because of that this added memory will treated as fast ram by the system, even if it is on the chipmem bus - often this is called slowfast, as it is as exactly as slow as chipmem from the cpu's point of view.

I am after the Commodore A501+ specifically btw

.

12 July 2009, 17:29

When you get ahold of one please post some pictures, and I would love one for my collection if you more than 1 offer

The A501+ I have is the 512kb version so I would love the 1 mb version.

John

Zetr0 · 12 July 2009, 19:45

@Drac

post up some hires pics of your A501+ I may be able to help upgrading it

11 July 2009, 04:37	#1
patrik Registered User Join Date: Jan 2005 Location: Umeå Age: 43 Posts: 922	Wanted: Commodore A501+ I am looking for a Commodore A501+ 1MB chipmem expansion for the A500+, i.e. this baby, but preferably with the metal shield intact. Last edited by patrik; 11 July 2009 at 05:30.

11 July 2009, 19:25	#3
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	@Drac the A501 is only a half meg 512KB memory expansion, where as the A501+ is a full meg expansion 1024KB theres some more info here Last edited by Zetr0; 12 July 2009 at 02:06.

12 July 2009, 05:01	#7
Drac Posts: n/a	That's good I looked at the pcb on the pictures he linked to and it says 512kb ram expansion on middle left side end and ABOH says it's 512kb on the pcb and the cardboardbox That's why I thought it was the same Learning something new every day Is booth A501 and A501+ chipram or fastram expansions ? ...Keller also has a 1 meg expansion called A501plus but it looks different. Last edited by Drac; 12 July 2009 at 06:17. Reason: Added Keller info

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11 July 2009, 14:14	#2
Drac Posts: n/a	Maybe this is what your looking for ? http://amigaworld.net/modules/classi...onces&lid=2389 Cheers John

11 July 2009, 20:22	#4
Drac Posts: n/a	I am sorry. My bad Please accept my apology. John

11 July 2009, 21:49	#5
bastibs Banned Join Date: Nov 2006 Location: Germany Posts: 122	He will do.

12 July 2009, 12:28	#8
patrik Registered User Join Date: Jan 2005 Location: Umeå Age: 43 Posts: 922	I guess that for the last revisions of the A501, they made a PCB which could be used for making both the A501 and A501+. In the A501 incarnation, for the regular A500, it would only have had four ram chips (256kx4 ram chips) and the realtime clock part would have been populated with chips and battery. They are both chipmem expansions, but on many A500's, the Agnus chip will only address 512kB chipmem and because of that this added memory will treated as fast ram by the system, even if it is on the chipmem bus - often this is called slowfast, as it is as exactly as slow as chipmem from the cpu's point of view. I am after the Commodore A501+ specifically btw .

12 July 2009, 17:29	#9
Drac Posts: n/a	When you get ahold of one please post some pictures, and I would love one for my collection if you more than 1 offer The A501+ I have is the 512kb version so I would love the 1 mb version. John

12 July 2009, 19:45	#10
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	@Drac post up some hires pics of your A501+ I may be able to help upgrading it

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