Want to Trade:- Need A4000 Rev C CR mobo

Zetr0 · 06 July 2009, 23:36

Hello there my fellow foum chummies,

okay... with the distinct *(never gonna get an acceess)* i have done some revisions to my calcualtions and I belive that an A4000 Rev C/D CR (thats with on-board soldered 030)

So Here I am to make a very decent offer you.

If you have said motherboard, I am willing to stright swap an A4000 Rev B with an A3640 040@25 Rev 3.1

surely thats a good deal

alexh · 07 July 2009, 00:58

I've never, ever, seen a REV C.

I've got several REV B's and a REV D but never seen a REV C.

Pretty sure there is no REV C or it was a prototype or something and you meant REV D.

CU_AMiGA · 07 July 2009, 01:18

isnt a rev d similar to rev c anyway?

Zetr0 · 07 July 2009, 01:18

I have noticed two versions of the Rev D, forgive me as I thought that the one with a mounted motherboard 030 was the Rev C

with the fact that the Rev D some were populated with an 030, some not, in the case of not theres solder mask and silk..... could this be populated?

CU_AMiGA · 07 July 2009, 01:19

didnt the rev d have a soldered 030 too?

Zetr0 · 07 July 2009, 01:25

yes, there seems two versions of the Rev D -CR

one with an EC030 soldered to the board, and one without.

I am assuming the fact its Zorro 3 addressing space means theres no issues with more than 8MB of RAM (compared to an EC030 on an A1200 *Z2*)

CU_AMiGA · 07 July 2009, 01:35

wot does this mean

Zetr0 · 07 July 2009, 06:00

@CU Amiga

Z2 addressing space only has upto 8MB so addressing ram internall as most EC based controllers do, it cannot (*without a lot of paging trickery*) have more than 8MB of Fast Ram

As you may know the A4000 can have 16MB of Fast and 2MB chip, I am assuming this will still be the case as its a Zorro 3 Bus which is a totally different memory map.

keropi · 07 July 2009, 06:18

sadly my remaining A4000D is "B" too , I would just swap mobos with you, 040/030 are useless to keropi anyways

alexh · 07 July 2009, 09:48

I see no evidence for two versions of Rev D other than a probable mistake on the Amiga hardware database A4000 page.

I see no evidence of a separate "Rev D -CR". All boards are marked "A4000cr Rev D". All photographs of Rev D boards are of the same version motherboard regardless as whether the 030 is populated or not.

I see no photo evidence of a Rev C at all (yet) other than a gap in the numbering scheme.

MC68EC030 has always had a 32-bit address bus. Any A1200 card which uses EC030 but can only address 8Mbytes of FAST RAM must be a bodge design inherited from an EC020 board and not have more than 24 address lines connected.

seuden · 07 July 2009, 09:56

Rev C (Rare)? No photo tho.

alexh · 07 July 2009, 10:07

The information on the BBoAH pages are user created and the chance exists that it is just "made up".

i.e. The editor of the page had never seen one, but had seen Rev D, assumed a Rev C must exist if there is a Rev D but must be rare as they had never seen one? This information is then passed around as fact over and over until people believe it.

Until I see a photo it is just a gap in the numbering scheme.

seuden · 07 July 2009, 10:26

Ah I see, okily dokily. Thanks alexh.

06 July 2009, 23:36	#1
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	Want to Trade:- Need A4000 Rev C/D CR mobo Hello there my fellow foum chummies, okay... with the distinct (never gonna get an acceess) i have done some revisions to my calcualtions and I belive that an A4000 Rev C/D CR (thats with on-board soldered 030) So Here I am to make a very decent offer you. If you have said motherboard, I am willing to stright swap an A4000 Rev B with an A3640 040@25 Rev 3.1 surely thats a good deal Last edited by Zetr0; 07 July 2009 at 01:26.

07 July 2009, 09:48	#10
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,397	I see no evidence for two versions of Rev D other than a probable mistake on the Amiga hardware database A4000 page. I see no evidence of a separate "Rev D -CR". All boards are marked "A4000cr Rev D". All photographs of Rev D boards are of the same version motherboard regardless as whether the 030 is populated or not. I see no photo evidence of a Rev C at all (yet) other than a gap in the numbering scheme. MC68EC030 has always had a 32-bit address bus. Any A1200 card which uses EC030 but can only address 8Mbytes of FAST RAM must be a bodge design inherited from an EC020 board and not have more than 24 address lines connected. Last edited by alexh; 07 July 2009 at 10:07.

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07 July 2009, 00:58	#2
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,397	I've never, ever, seen a REV C. I've got several REV B's and a REV D but never seen a REV C. Pretty sure there is no REV C or it was a prototype or something and you meant REV D.

07 July 2009, 01:18	#3
CU_AMiGA Banned Join Date: Dec 2003 Location: Exeter Age: 39 Posts: 970	isnt a rev d similar to rev c anyway?

07 July 2009, 01:19	#5
CU_AMiGA Banned Join Date: Dec 2003 Location: Exeter Age: 39 Posts: 970	didnt the rev d have a soldered 030 too?

07 July 2009, 01:25	#6
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	yes, there seems two versions of the Rev D -CR one with an EC030 soldered to the board, and one without. I am assuming the fact its Zorro 3 addressing space means theres no issues with more than 8MB of RAM (compared to an EC030 on an A1200 Z2)

07 July 2009, 01:35	#7
CU_AMiGA Banned Join Date: Dec 2003 Location: Exeter Age: 39 Posts: 970	wot does this mean

07 July 2009, 06:00	#8
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	@CU Amiga Z2 addressing space only has upto 8MB so addressing ram internall as most EC based controllers do, it cannot (without a lot of paging trickery) have more than 8MB of Fast Ram As you may know the A4000 can have 16MB of Fast and 2MB chip, I am assuming this will still be the case as its a Zorro 3 Bus which is a totally different memory map.

07 July 2009, 06:18	#9
keropi . Join Date: Oct 2004 Location: Ioannina/Greece Posts: 5,040	sadly my remaining A4000D is "B" too , I would just swap mobos with you, 040/030 are useless to keropi anyways

07 July 2009, 09:56	#11
seuden uber cool demi god Join Date: Jun 2006 Location: Kent/England Posts: 2,073	Rev C (Rare)? No photo tho.

07 July 2009, 10:07	#12
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,397	The information on the BBoAH pages are user created and the chance exists that it is just "made up". i.e. The editor of the page had never seen one, but had seen Rev D, assumed a Rev C must exist if there is a Rev D but must be rare as they had never seen one? This information is then passed around as fact over and over until people believe it. Until I see a photo it is just a gap in the numbering scheme.

07 July 2009, 10:26	#13
seuden uber cool demi god Join Date: Jun 2006 Location: Kent/England Posts: 2,073	Ah I see, okily dokily. Thanks alexh.

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