A600 8Mb fast expansion

[rkauer]

:bump:

[rkauer]

:bump: again!

 Does anybody does how I reach LordV? I need to ask him some other questions, but he not answer the PM...

[rkauer]

alexh wrote:
I think the advantages of the seller to populate the board to 8Mbyte before shipping outweigh the disadvantages of designing the board to take a simm slot and then sourcing the simms.

 Maybe this is easy to do in Europe and USA, but here, in "Cucarachaland" we have a major plague: brazilian customs(!).  The not only put a "little" tax over it (107% of costs, including shipment), but sometimes they simply STOPS the imports!

 I prefer to buy a blank board and scavenge a SIMM or (a little better) solder a SIMM directly to the bareboard.

[rkauer]

 Please, let me be the first person to congratulate you for the excellent idea and hard work.

 If you guess, I'm making a tutorial to the "A601 without RTC" (aka Tabajara 1.01).

 Keep the good work! :bow:

 And a comment: this make my banana dance! :banana:  :banana:  :banana:  :banana:  :banana:

[rkauer]

Colani1200 wrote:
Great stuff. How much are they populated with 4MB?

 If you read the guides inside the package, you notice the board doesn't change at all, only the code in CPLD will change.

 So doesn't matter if you choose 4 or 8Mb, the board hardware will still the very same.

[rkauer]

Colani1200 wrote:

EDIT: Or even easier: Use the 8 MB non-autoconfig firmware and choose with the addmem command how much to use?  :-o

BTW: What will be the advantage of the 2008 version?

 The board is fully auto-config. No way to use ADDmem.

[rkauer]

tokyoracer wrote:
Sorry for being so late in this topic here but I didn't know this would be in production! Just 1 query, will it work along-side other ram expansions on the trapdoor slot and will it be ok with a PCMCIA CD-Drive?
Finally, what price are we looking at? :-)

 The expansion on the trapdoor is only 1Mb chip RAM, the project is for up to 8Mb of fast RAM.

 With 8Mb the PCMCIA slot will be disabled. Maybe the next design solve this issue.

[rkauer]

tokyoracer wrote:
No I mean will it work along side my 1Mb expansion?

 Indeed! If you use this board as a 8Mb expansion, you'll have 10Mb of total RAM.

 If used it setted to 4Mb, expect to have 6Mb.

[rkauer]

1NOM155 wrote:
can this be apply to A500, with full 8mb?

 Of course it can! But you have to modify the 68000 connector to use a DIL socket (wired, perhaps?).

 Or make a new designed board.

 But the schematics will not change a single bit.

[rkauer]

 A600's trapdoor don't have CPU lines, only CAS/RAS and chip memory address bus, plus the reset signal (good to put a reset button), RTC and audio lines.

[rkauer]

 Just another question.

 Do I need to relocate the hd of the A600 with this new design, like the old one?

[rkauer]

OK, then.

 But my wife will complain about it:

"You buy another gear to your Amigas?!?! SD card, adaptors? And the hd you bought last month?" Aaaargh! :whack::destroy:

[rkauer]

 Superb work!:bow:

 Any chance to use a selector switch behind the A600 to avoid keep opening it?

 BTW: how is the price now, with the new design?

[rkauer]

alexh wrote:

@LordV
Do you think there would be enough height clearance to use one of these??
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=230187497732

 If you use a bit longer pins, why not?

 Or just put some insulation between the boards.

[rkauer]

alexh wrote:
The benefit of the one I mention is that it is internal, no data cable, no power cables. Just plugs directly ontop of the IDE header.

I'm not sure there will be enough clearance but we'll find out.

 @Alexh.

 Like I'd say before, put a piece of mylar between the boards and you are done. Even with enough clearance, it is a safe measure (remind the 8Mb board is standing only in the CPU PLCC connector).

[rkauer]

 What about selling the board and the FPGA already soldered for the same 16 USD or even a bit more?