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AuthorTopic: Amiga 600 CPU  (Read 5934 times)

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Offline trekiej

Amiga 600 CPU
« on: August 12, 2020, 10:25:02 PM »
Would it be too difficult to upgrade to a new faster 68000 cpu on an A600?
Would a clock divider be necessary?
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Offline beller

Re: Amiga 600 CPU
« Reply #1 on: August 12, 2020, 10:49:24 PM »
I put a Furia accelerator in my A600.  It has an '020 and FPU with 9.5 megabytes of RAM.

Time to go shopping?

Offline trekiej

Re: Amiga 600 CPU
« Reply #2 on: August 12, 2020, 11:15:39 PM »
I guess I am not frustrated with the cpu that is in it.
I still have only one meg. or ram.

Just curios about how a new board could manage it.
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Offline Oldsmobile_Mike

Re: Amiga 600 CPU
« Reply #3 on: August 13, 2020, 01:36:32 AM »
Plenty of accelerators available for the A600.  Or are you talking about replacing the 68000 on the motherboard itself?
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Offline trekiej

Re: Amiga 600 CPU
« Reply #4 on: August 13, 2020, 01:52:52 AM »
Yes, I was thinking about it and am wanting to know how it could be possible to do so on a new board.
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Offline zipper

Re: Amiga 600 CPU
« Reply #5 on: August 13, 2020, 12:06:43 PM »
Probably, like A500 14 MHz hack. Benefits: low. Problems: probably many. http://eab.abime.net/showthread.php?t=54474

Offline darksun9210

Re: Amiga 600 CPU
« Reply #6 on: August 13, 2020, 03:34:54 PM »
well keeping it as simple as possible, no buffers, you'd just run a synchronous or a multiplier of, the 7Mhz clock, so 14/28/56Mhz etc.
but as you're not replacing the 68000 given that it's soldered onto the board, it's still "live" - you're adding something else onto it's bus. You'd have to have some basic logic to negotiate control of the bus with/from the original 68000 and put it to sleep. same for the 1200 with it's onboard 020.

i don't know how much more it would need from there to buffer the original 7Mhz side of the control logic and allow whatever you like on the other side:- be it an actual 25Mhz bus with 030 and some zero wait state fast ram or whatever.

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Offline trekiej

Re: Amiga 600 CPU
« Reply #7 on: August 14, 2020, 02:15:48 AM »
I do know that the 68000 has the Bus Grant, Bus Request, and ACKnowledge lines. BG, BR, BACK, I think. It has been a while.
It does have some form of multi-cpu capability.
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Offline vince_6

Re: Amiga 600 CPU
« Reply #8 on: August 16, 2020, 03:50:46 PM »
Terrible idea for the internal cpu.
An accelerator card is what you need.
A faster cpu with some cache and 32bit fast ram running asynchronously is what will give you results.
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Offline trekiej

Re: Amiga 600 CPU
« Reply #9 on: August 18, 2020, 04:18:02 AM »
I hope some one makes a FPGA main board for the A600.
Meantime an 060 or 040 would do.
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Offline kolla

Re: Amiga 600 CPU
« Reply #10 on: August 19, 2020, 03:54:12 PM »
I hope some one makes a FPGA main board for the A600.
You mean a replacement motherboard? Like the unAmiga, only fit for A600 case? That can happen.
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Offline trekiej

Re: Amiga 600 CPU
« Reply #11 on: August 20, 2020, 03:37:05 AM »
Yes. like the UnAmiga.
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Offline trekiej

Re: Amiga 600 CPU
« Reply #12 on: March 03, 2021, 08:24:57 PM »
One of my A600's has a keyboard problem. Earlier it would only register the F1 key. I re-seated the cable and now get most of the keys but not the two Amiga Keys and some CTRL keys.
I need to buy a new keyboard membrane and hopefully it will fix the problem. The connector or the ribbon cable connector could be the problem.

What say ye?
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Offline Pat the Cat

Re: Amiga 600 CPU
« Reply #13 on: March 04, 2021, 05:02:59 AM »
There isn't that much else in an A600 keyboard to fix?
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Offline trekiej

Re: Amiga 600 CPU
« Reply #14 on: March 04, 2021, 08:31:29 PM »
Ugh, I need more money. :)
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