A600 8Mb fast expansion

[AJCopland]

freqmax wrote:
Minimig can use a 64 MB dram directly. By just replacing the current sram chip. And change the HDL-code.
So no need for a particular "ram expansion" per se.

The question is rather what to do with any ram above >16MB :-D

Which drams could it use directly? I haven't seen any electrically compatible 44pin tssop drams that would fit or have I misunderstood?

Andy

[1NOM155]

does anyone know the memory type its used in A500 512kb expansion ram?

see my expansion memory ram:



i know its bad, but clean it, i will put new photos soon, but i need some help to rebuild a new board and maybe make a new ones.

[freqmax]

Minimig can use DRAM that is 3.3V LVTTL single-ended electrically. Functionality is taken care of with HDL-code.
The chip package will ofcourse differ, so either a hack-breakboard will have to be made. Or you simple design a board with correct package size.

Connecting a P-ATA drive something completly different than adding DRAM.

The DRAM on the picture above is likely 5V standard RAS/CAS. Nothing special then perhaps a specific pinout. Check wikipedia on this issue.
http://en.wikipedia.org/wiki/SIMM

[Jeff]

It would be great if mrmkl's IDE68K project could be merged with lordv's 68K memory expansion board. This would be perfect for the A500, A1000, CDTV, ect. Perhaps a header could be added to the IDE68K board so it would interconnect with the existing 2008 memory board design. This would add flexibility for installation in different cases, that is if it would even work at all.

I have the IDE 68K working in a 1000 just fine but I have no way to add any expansion memory (short of the old piggyback hack) as the 86 pin Bus is occupied by a Sidecar. This would be perfect! Sorry if I Hi-Jacked the thread.

Jeff

[mrmkl]

To integrate things on the same pcb takes some layout work.
But if lordv would make a DIP-64 version of the DRAM-board, you could stack it and other kinds of expansion cards as a "tower-sandwich". Well maybe not if the Amiga mainboard is in the original case. (A500, also CDTV has little clearance, A2000?, other dip-64 68000 systems?)

Edit: @Jeff, How much is there free space inside the A1000 in the "upward" direction starting from the mainboad socket?

[TjLaZer]

@jeff

Can't you add an Insider or Spirit board piggybacked on the Ide68k?

[Jeff]

@mrmkl
There will be plenty of room vertically above the CPU socket for another board in the 1000. The only thing you might have to do is notch the rear of the floppy drive mounting bracket, no big deal. Although I am good with hardware, modifying the layout of lordv's board is probably more than I am in for at the moment.

BTW look here for a picture of your IDE68K board finished and working in the A1000
A1000 IDE68K Running
A1000 Motherboard Kick 3.1 and IDE68K

@TJLazer
The Insider and Spirit boards are next to impossible to find these days, at least for me. Do you know where I can find one? Even the AdIDE I was watching a while back went for over $200.00. That was when I decided to hold out for the IDE68k which works brilliantly. For now the project has been shelved until something turns up. I've given up on the ranger board inside the sidecar, the expansion bus just isn't stable enough.

Thanks for all the help,
-Jeff

[TjLaZer]

@Jeff,

Yeah they are hard to find.  I have an Insider II in my A1000, would love to have an internal HD and Kick 3.1!

[alexh]

Any sign of these boards? We placed our orders a long time ago. No pressure, I'd just like to know where we are upto.

[a1200]

Did anyone ever get their boards or was it some new Russian ploy to con money from the westerners?

[countzero]

Jope from Finland got his boards over at EAB Forum. He got three of them :-o

[Argus]

I saw a Spirit 1000 board on ebay maybe a couple months ago, it sold for maybe $25.00.

A better option would be putting a Derringer030 or VXL030 in the A1000.  The 68kide board would be good for raising the height of the board to clear the daughterboard.  Maybe even put in one of Jens' clockport adapter cards as well.  There's a guy who did this (Paul Zaeger) to his Franken1000.

An A1000 with internal 32mb fast ram, 68030/68882, OS3.9, and USB ports via the clockport would be very cool.

There also was a CSA Derringer that sold buy it now for only $99.00 just a couple weeks ago (it was in an ebay store).  Almost bought it myself but I already have one

[Crumb]

alexh wrote:
Any sign of these boards? We placed our orders a long time ago. No pressure, I'd just like to know where we are upto.

 :bump:

what Alexh said ;-)

[alexh]

I emailed several times since... no response. I haven't paid because I never got an invoice.

Some people have had their invoices, paid and have already got their boards!

[amigadave]

freqmax wrote:
Minimig can use a 64 MB dram directly. By just replacing the current sram chip. And change the HDL-code.
So no need for a particular "ram expansion" per se.

The question is rather what to do with any ram above >16MB :-D

I was going to pose this question in one of the other MiniMig threads, but since you stated the above in this thread, I will ask it here.  When I ordered my sram from digikey they sent me 8mb chips instead of the two 1mb chips I ordered.  At least that is what is on the invoice.  I was wondering if I could install them and have the Minimig still work, or if I have to replace them with the originally spec'd 1mb chips?  I figured since they were for chip RAM they would have to be switched.

[alexh]

Check the pinout of the two chips.

Freqmax is almost certainly wrong about this.

1) I cannot imagine there are enough address lines for 64MBytes. What a waste of FPGA I/O that would have been.

2) 68k can only access 16Mbytes in total, and Amiga architecture can only have 10Mbytes of that as RAM.

3) Also we would have seen more MiniMig's with more RAM by now.