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#1 |
Moon 1969 = amiga 1985
Join Date: Apr 2007
Location: belgium
Age: 48
Posts: 3,913
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fpga for ecs -> aga
could it be possible to make an fpga for amiga 500 which give aga compatibility to it ?????
possible or not from technical pov ?? ![]() |
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#2 |
MI clan prevails
Join Date: Jul 2010
Location: Belgrade, Serbia
Posts: 1,443
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Well, as a kind of a replacement mobo, yes.
Something like FPGA Arcade, but with an A500 keyboard connector, and a floppy connector. Possibly some break out cables for rear ports. So you could close the case, and use a souped up AGA Amiga. Technically, it is possible to build it today. We "just" need someone to take up such a project ![]() But if you mean a board which would clip on to the A500 and give it AGA powers, well I don't know. Maybe. Maybe a couple of boards to place them around A500 board. Somehow my first scenario seems easier ![]() |
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#3 |
Paranoid Amigoid
Join Date: Mar 2008
Location: Athens/Greece
Age: 45
Posts: 1,978
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There was a prototype of an expansion board that had AGA chipset and also an adapter for A1200 accelerators like BPPC.
Would have been really nice for beefy A500 systems... on the other hand, for the price you should have gotten easily an A1200 in less money ![]() ![]() |
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#4 | |
Moon 1969 = amiga 1985
Join Date: Apr 2007
Location: belgium
Age: 48
Posts: 3,913
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Quote:
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#5 | |
Registered User
Join Date: Jun 2010
Location: PL?
Posts: 2,875
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Quote:
Yes, AGA itself was designed to work with 16 bit CPU i.e. MC68000 - Budgie/Bridgette i think have special mode to work with such configuration. However in FPGA there is no sens to duplicate such configuration as there is plenty new possibilities to exploit. |
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#6 |
Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,461
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#7 |
Moon 1969 = amiga 1985
Join Date: Apr 2007
Location: belgium
Age: 48
Posts: 3,913
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#8 |
Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,461
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I don't think they did. I think they connected their own recreation of an A1200 to the CPU socket of the A500 and removed all of the OCS/ECS motherboard chips.
If you want AGA in an A500 you should consider doing what a couple of people once did, put an A1200 motherboard in an A500 case. http://eab.abime.net/hardware-mods/6...n-s-a1700.html http://eab.abime.net/hardware-mods/3...e-s-a1700.html |
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#9 |
Registered User
Join Date: Jun 2010
Location: PL?
Posts: 2,875
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Yes, this is possible - you need only recreate Alice and Lisa in FPGA i.e. provide board that use physical Agnus and Denise sockets (IMHO waste of time as you can fit whole AGA in FPGA and also MC68000 can be integrated at once, provide external memory and there is no need to struggle with A500 board).
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#10 |
Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,461
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#11 | |
Registered User
Join Date: Jun 2010
Location: PL?
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Quote:
![]() Personally i see no justification to do such strange thing like AGA on OCS board. FPGA probably will be large enough to integrate also Paula and both CIA's - integration of the CPU is open, external SDRAM and that's all. |
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#12 |
Join Date: Jul 2008
Location: Sweden
Posts: 2,269
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AGA requires chipmem to have 4x as much bandwidth, can that really be solved by just replacing these two chips?
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#13 |
MI clan prevails
Join Date: Jul 2010
Location: Belgrade, Serbia
Posts: 1,443
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Well, as I said earlier, it's so much fuss that a FPGA replacement mobo is much easier to do
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#14 |
Moon 1969 = amiga 1985
Join Date: Apr 2007
Location: belgium
Age: 48
Posts: 3,913
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#15 |
Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,461
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Shame the Keyrah v2 doesn't support the A500 keyboard
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#16 |
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 43
Posts: 9,910
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It does, but the flexi cable is a bit short. :-)
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#17 |
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Location: Norfolk, UK
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#18 | |
Registered User
Join Date: Jun 2010
Location: PL?
Posts: 2,875
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Quote:
Most of the DRAM chips (AFAIR 41256 also) support fast page mode - but this is not the case - RAM should be local (FPGA), probably SDRAM thus with much higher bandwidth and with few tricks it can be designed and offer higher (much higher) bandwidth (hide all DMA cycles form CPU for example thus no penalty even for most demanding video mode) |
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