Would an A1200 cpu slot to A4000 cpu slot work ?

SimonV · 22 April 2014, 22:28

Hello, my first post here, I did ask the below question at Amibay but didn't get much feedback. Since this place seems to be the birthplace of some recent interesting hacks and hardware projects i'll try it here. It interests me.

Just something I wonder ... I saw busboards for A1200 that accept an A4000 accelerator. But would it work backwards ? An new ACA1200 with 128Mb ram on the cpuslot of an A4000 or even A3000 ? or maybe a blizzardPPC ? Can't be that expensive to produce if it works.

Toni Wilen · 23 April 2014, 08:24

AFAIK A1200 trapdoor slot has pins for full 32-bit address space but only 24 are connected in both Amiga and accelerator side. (Cheaper boards, cheaper memory controller)

24-bit CPU address space limit in A4000 would not allow access to A4000 mainboard fast ram or to any Z3 boards.

It probably would "work" but it would make mostly useless A4000.

delshay · 23 April 2014, 08:53

Are the remaining 7 address lines present on the A1200 motherboard? ...lack of time to look at PDF.

22 April 2014, 22:28	#1
SimonV Registered User Join Date: Apr 2014 Location: Antwerp Posts: 262	Would an A1200 cpu slot to A4000 cpu slot work ? Hello, my first post here, I did ask the below question at Amibay but didn't get much feedback. Since this place seems to be the birthplace of some recent interesting hacks and hardware projects i'll try it here. It interests me. Just something I wonder ... I saw busboards for A1200 that accept an A4000 accelerator. But would it work backwards ? An new ACA1200 with 128Mb ram on the cpuslot of an A4000 or even A3000 ? or maybe a blizzardPPC ? Can't be that expensive to produce if it works.

23 April 2014, 08:53	#3
delshay Registered User Join Date: Jan 2011 Location: uk Posts: 245	Are the remaining 7 address lines present on the A1200 motherboard? ...lack of time to look at PDF. Last edited by delshay; 23 April 2014 at 09:16.

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23 April 2014, 08:24	#2
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,516	AFAIK A1200 trapdoor slot has pins for full 32-bit address space but only 24 are connected in both Amiga and accelerator side. (Cheaper boards, cheaper memory controller) 24-bit CPU address space limit in A4000 would not allow access to A4000 mainboard fast ram or to any Z3 boards. It probably would "work" but it would make mostly useless A4000.

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