128megs on a CSA Derringer 030

[Oldsmobile_Mike]

I have an Indivision in my A500, along with VXL*30 accelerator.  I used a spacer on the CPU socket, it fits fine, also clears the MegaChip I have stuck in the Agnus socket.  Case closes fine, although I do have a square of thin foam insulation between the boards and another between the bottom of the keyboard and the top of the accelerator, just in case.  VXL looks to be about the same size as the Derringer, although I do wish I had a Derringer instead now that this hack is out!  

[Oldsmobile_Mike]

Sweet! Someone should start a Kickstarter to get @Metalguy66 some of those A1200 expansions. We all know the A1200 can address more than 8MB through it's expansion slot, so why the limit on so many of the standard ram/FPU/clock combo cards?

Or is it because of the "EC" nature of the A1200's 68020? I can't recall off-hand, does it only have 24-bit addressing or something?

Now we just need you to make a mod to allow GVP accelerator cards to use anything other than those damned proprietary GVP SIMM's! :hammer:

[Oldsmobile_Mike]

Hi @Metalguy66:

I'm just going to throw this idea out there, hopefully it's not too crazy.  

Most A2000-style GVP accelerators can accommodate up to 64MB of ram.  At least, their '040 boards.  But to do this, you need four of the proprietary 16MB GVP SIMM's.  Most people only have the 4MB SIMM's.  Your above post gave me this idea:  since the accelerator card itself can already support the additional memory, do you think it would be possible to piggyback additional ram chips onto the 4MB modules to "make them into 16MB modules"?  Since the actual 16MB modules are rarer than hen's teeth, apparently.  

http://amiga.resource.cx/exp/gforce2040

I'd be glad to get a 4MB module to send to you, or send you high res photos of the chips, if you think that would help?

Just want your opinion, since you're the expert on this stuff.  Thanks!  

[Oldsmobile_Mike]

1.) I'd need the A2000, the Accelerator, and the RAM.
2.) It would be much more productive to just go ahead and wire in 72pin SIMM sockets. Less connections, less of an unorthodox "ass-rig" and if the dram ever went bad, you'd be able to replace the SIMMs.
3.) You are talking about a VERY involved project. Not something worth writing up for others to easily attempt.
4.) Yes, any machine with at least a 68020 has a 32bit data bus and at least 4 gigs of physical address space. Its just a matter of designing the dram control/address circuits (or modding existing ones) to get the dram on the bus.
5.) I'd be willing to look at anything, and even attempt anything if price is no object, but unless theres already a standard simm socket there, the end result is not gonna be an easily repeatable "hack".

Ah, makes sense.  I don't know if anyone has ever managed to replace GVP SIMM sockets with standard ones?  You've given me something new to look into, thanks!  

[Oldsmobile_Mike]

they have

http://aminet.net/package/docs/hard/gvpsim64
gvp simms are wired quite different than typical 72 pin simms but its possible to adapt it.

I found that this morning, actually.  Too bad most of the instructions/pictures are in French.  Ah, FML!  :laughing:

[Oldsmobile_Mike]

Carefull, it is not "at least 4 gigs", it is a theoretical maximum of 4 gibibytes of physical address space, and in reality less (some address is reserved to chipram for example). Oldsmobile here is very sensitive when it comes to this kind of information.

Still trolling?  Glad to know I hit a nerve.  :roflmao:

FWIW, @Metalguy66 did say "at least a 68020", not the 16-bit data bus / 24-bit address bus 68000, which was the basis for your whole idiotic argument in the first place.  

Edit: PS - what is a "gibibyte"?  :p  Also, chip ram reservations are because of the Amiga architecture, not a limitation placed by the processor itself.  Man, I can't think of a single accurate statement in your entire post.  Bye!