64 mb on A4000 mobo

[Doraemon]

Hello!
Some time agó someone in spain called "Dr. Bacterius" makes a hardware modification on the amiga 4000 motherboard to accept 64mb of ram.
Now "Dr. Bacterius" its imposible to find.
Anyone knows any document or tutorial describing how I can make this?

Thanks and sorry for my bad english

[keropi]

if that was true, all would have done that...

[ltstanfo]

keropi wrote:
if that was true, all would have done that...

Precisely... that is one of the "holy grails" of AMIGA lore that has never been accomplished.  16MB on the mobo is the limit.

Regards,
Ltstanfo

[FrankBrana]

Yes, its possible indeed.

I wont share any info. Sorry

[LoadWB]

Actually, not that it's anyone's business, but I have modified my A4000 desktop to run 64MB on the mobo and 8MB of ChipRAM.  

I chose wisely.

[Tahoe]

I just did the 8MB ChipRam rework. my SIMM sockets for fast ram are broken; so I just use 128MB on my Cyberstorm.

[Ral-Clan]

I have hacked my stock Amiga 500 running Workbench 1.2 to interface with a human brain through the clock-port.  Quite easy actually, considering the miracle of the clock port design.  Only takes about $5 in parts from any kitchen supply store and a bottlecap. Unlimited RAM and file storage.

Sorry, but it's a secret so I'm not telling anyone how to make it.  ;-)

[LoadWB]

That's sweet and all, since you're not using the original Amiga hardware to accomplish this feat, I'm afraid we can't just you as technically running a "Classic" hack.

On a serious note, checking several different search engines resulted in no references to this project or the person.

[Crumb]

if that was true, all would have done that...

It's true

He also reprogrammed the IDE GAL chap so it gives 5MB/s with a CSMKII. I know at least two people in Spain with that trick. It only involved reprogramming the GAL chip. It was done cleanly, without overclocking anything. He optimized the code that managed the transfers of the IDE port of the GAL found in old A4000 revisions. He was in contact with David Haynie to do this.

The modifications required for 64MB support were more complex and involved more than reprogramming a chip. You had to sent him the motherboard.

He also overclocked the AGA chips (One of my best friends also does this with his A2000 from time to time so he watches 100Hz/31Khz pseudoPAL screenmodes without scandoubler), the ZorroIII bus, his 3640 board...


Just because you haven't seen it, it doesn't mean it doesn't exist.

Just to clarify: AFAIK the IDE trick could only be done with old board revisions, and the 64MB trick involved more work than changing a single chip like the IDE speedup trick...

@FrankBrana

Gure gasiosie! ;-)  :pint:

[snowman040]

I think he used to advertise in c.s.a.hardware...

p.s. Yesterday I found prophet64 forum, seems like Commodore64 users have done much more 'hacking' to C64 then Amiga users to any model :-( Probably due more complex design, but still :-(

[TrevorDick]

ral-clan wrote:-

I have hacked my stock Amiga 500 running Workbench 1.2 to interface with a human brain through the clock-port. Quite easy actually, considering the miracle of the clock port design. Only takes about $5 in parts from any kitchen supply store and a bottlecap.

I tried it with my A1200 and a special interface I wired to my left ear. I now too have unlimited Ram (not stictly true as it's limited to the capacity of my brain, which although very large is not quite unlimited) but the trouble is I can no longer get stereo sound out of my amiga, and I've got earache! BTW what type of bottlecap did you use? ;-)

[Ral-Clan]

I tried it with my A1200 and a special interface I wired to my left ear. I now too have unlimited Ram (not stictly true as it's limited to the capacity of my brain, which although very large is not quite unlimited) but the trouble is I can no longer get stereo sound out of my amiga, and I've got earache! BTW what type of bottlecap did you use?

I used a bottlecap from a 1973 stubby bottle of "Orange Crush".  I have found this to be the best solution for this hack.  I tried a 1974 cap, but I couldn't access all my screen-modes.  Diet-orange crush bottle caps work but I get occasional GURUs this way.  I think it has something to do with the artificial sweetener residue.

As for your loss of stereo problem.  I have overcome that.  My solution was to use someone else's brain (oops, I wasn't supposed to tell you that).  :-P

[keropi]

I have to see it to believe 64MB on 4000, and as for overclocked chipset... overclocking??? chipset???

[Effy]

As for overclocking the A4000 mb, I know that you can underclock it in order to have higher Z3 speed but in return you get a {bleep}ed up sound and video unless you use a gfx card  :-)

[redrumloa]

Effy wrote:
As for overclocking the A4000 mb, I know that you can underclock it in order to have higher Z3 speed but in return you get a {bleep}ed up sound and video unless you use a gfx card  :-)

Exactly. Use a sound card and a video card and it's quite good :-)