A4000 scratch build

rthorntn · 15 June 2019, 03:49

Hi,

I purchased an Amiga 4000 Rev B PCB and an A3660 Rev 1.1 PCB from Ebay.

I can solder surface mount.

How do I get started, most people have dead boards and they transplant stuff across but I have nothing, does anyone know which components are proprietary or obsolete, has anyone seen people selling these components as a set?

Has anyone seen a BoM for one of the supplier sites (digikey, mouser...) for the components that are still in production?

Thanks for looking.

Cheers
Richard

trixster · 15 June 2019, 12:37

Icomp in Germany and analogic in the uk should be able to sell you the necessary custom chips for the motherboard

I think this is the list of chips required for the Hese replacement A4000 motherboard project, it should get you going:

https://www.mouser.co.uk/ProjectMana...sID=5f4fc3ee90

Hewitson · 15 June 2019, 15:24

What an exciting project, I'd love to do this myself. I don't have an A4000 case though.

Mick · 15 June 2019, 16:45

You can buy the A4000 custom chips and 23 pin D-Sub connectors from Individual Computers (icomp.de).

The rest of the difficult parts should be obtainable from Ebay:

28.37516Mhz Crystal (or amigakit.com)
ADV7120 Video DAC
CPU connectors (or store.inertialcomputing.com)
PGA socket (223pin needed I think for 68060)
Ricoh RP5C01 RTC (or amigakit.com)
74F139D
DS1000-25 (you can use a new DS1100Z-25+ on the A3660)
74F803D (again you can use a new 74F175D as an alternative)
72pin memory sockets (or amigakit.com)
6 pin power connector is TE Connectivity 350827-1

You can probably buy all of the GAL's pre-programmed from someone on here if you don't have the knowhow/tools to do it yourself.

The rest of the parts will be easy enough to source new I should think.

rthorntn · 16 June 2019, 03:12

Amazing, thanks trixster and Mick!

obitus1990 · 16 June 2019, 03:28

The BOM is on the Github page. I don't think there's a mouser shared cart. The CR version that Trixster linked to is likely different -- for instance, the CR board has PLCC20 GALs on it, while the RevB has PLCC20s with one PLCC28.

rthorntn · 16 June 2019, 04:56

Thanks kirk_m, I have already ordered it but I just checked and out of the $350 AUD only $10 AUD was the GAL's, so they are for the spares bin, fingers crossed there won't be too many differences.

Mick · 16 June 2019, 15:29

Rev. B also uses stacked 25pin D-Sub.

rthorntn · 17 June 2019, 01:16

Thanks Mick

johntayloruk · 16 May 2020, 11:05

Hi Richard, I’m just about to do the same.
How did you get on and where did you manage to source the Gals and other hard to find parts:

- ADV7120 Video DAC
74F139D
74F803D

John

15 June 2019, 03:49	#1
rthorntn Registered User Join Date: Oct 2018 Location: Sydney / Australia Posts: 18	Advice on A4000 scratch build Hi, I purchased an Amiga 4000 Rev B PCB and an A3660 Rev 1.1 PCB from Ebay. I can solder surface mount. How do I get started, most people have dead boards and they transplant stuff across but I have nothing, does anyone know which components are proprietary or obsolete, has anyone seen people selling these components as a set? Has anyone seen a BoM for one of the supplier sites (digikey, mouser...) for the components that are still in production? Thanks for looking. Cheers Richard Last edited by rthorntn; 15 June 2019 at 04:05.

15 June 2019, 16:45	#4
Mick Registered User Join Date: Jan 2004 Location: Yorkshire Posts: 710	You can buy the A4000 custom chips and 23 pin D-Sub connectors from Individual Computers (icomp.de). The rest of the difficult parts should be obtainable from Ebay: 28.37516Mhz Crystal (or amigakit.com) ADV7120 Video DAC CPU connectors (or store.inertialcomputing.com) PGA socket (223pin needed I think for 68060) Ricoh RP5C01 RTC (or amigakit.com) 74F139D DS1000-25 (you can use a new DS1100Z-25+ on the A3660) 74F803D (again you can use a new 74F175D as an alternative) 72pin memory sockets (or amigakit.com) 6 pin power connector is TE Connectivity 350827-1 You can probably buy all of the GAL's pre-programmed from someone on here if you don't have the knowhow/tools to do it yourself. The rest of the parts will be easy enough to source new I should think. Last edited by Mick; 15 June 2019 at 16:58.

16 June 2019, 03:12	#5
rthorntn Registered User Join Date: Oct 2018 Location: Sydney / Australia Posts: 18	Amazing, thanks trixster and Mick! Last edited by rthorntn; 16 June 2019 at 03:25.

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15 June 2019, 12:37	#2
trixster Guru Meditating Join Date: Jun 2014 Location: England Posts: 2,347	Icomp in Germany and analogic in the uk should be able to sell you the necessary custom chips for the motherboard I think this is the list of chips required for the Hese replacement A4000 motherboard project, it should get you going: https://www.mouser.co.uk/ProjectMana...sID=5f4fc3ee90

15 June 2019, 15:24	#3
Hewitson Registered User Join Date: Feb 2007 Location: Melbourne, Australia Age: 41 Posts: 3,773	What an exciting project, I'd love to do this myself. I don't have an A4000 case though.

16 June 2019, 03:28	#6
obitus1990 Registered User Join Date: May 2016 Location: Mandeville USA Posts: 203	The BOM is on the Github page. I don't think there's a mouser shared cart. The CR version that Trixster linked to is likely different -- for instance, the CR board has PLCC20 GALs on it, while the RevB has PLCC20s with one PLCC28.

16 June 2019, 04:56	#7
rthorntn Registered User Join Date: Oct 2018 Location: Sydney / Australia Posts: 18	Thanks kirk_m, I have already ordered it but I just checked and out of the $350 AUD only $10 AUD was the GAL's, so they are for the spares bin, fingers crossed there won't be too many differences.

16 June 2019, 15:29	#8
Mick Registered User Join Date: Jan 2004 Location: Yorkshire Posts: 710	Rev. B also uses stacked 25pin D-Sub.

17 June 2019, 01:16	#9
rthorntn Registered User Join Date: Oct 2018 Location: Sydney / Australia Posts: 18	Thanks Mick

16 May 2020, 11:05	#10
johntayloruk Registered User Join Date: Apr 2020 Location: Huddersfield Posts: 33	Hi Richard, I’m just about to do the same. How did you get on and where did you manage to source the Gals and other hard to find parts: - ADV7120 Video DAC 74F139D 74F803D John

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