A600 8Mb fast expansion

[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.

[AJCopland]

amigadave wrote:
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'm at work so can't check my invoice to compare but I'd bet they're actually 8Mbit rather than 8MByte, i.e: 8Mbit = 1MByte.

The only way to get more ram on the MiniMigs is to attach something like the A600 8Mb fast expansion this thread is all about, which might be possible actually. Or to redesign the MiniMig board a little to take either a lot more SRAM (expensive) or cheaper SDRAM. Either way it'll need a new board I think.

I did take a look at using some of the spare IO on the MiniMig 1.1 board to try and do some "dead-bug" style modding with a single 64Mbit SDRAM chip but I don't think that approach would actually be feasible for a host of reasons. Besides I'm still building my FIRST MiniMig! :-D

Andy

[boing4000]

AJCopland wrote:

I did take a look at using some of the spare IO on the MiniMig 1.1 board to try and do some "dead-bug" style modding with a single 64Mbit SDRAM chip but I don't think that approach would actually be feasible for a host of reasons. Besides I'm still building my FIRST MiniMig! :-D

Andy

Spare-I/O offers 3 bit, adding 15/31khz pin as IO make 4 bit for extra use. It could help for addressing more (s)ram.
Altering the existing internal ram structure could be used to have 512kb chipram and 1mb real fast ram starting at $200000 (with propper autoconfig entry). In this case bootrom.v has to be adapted to work with less then 1mb of chipram.
I hope your first selfmade minimig will be finished soon :-)

[skurk]

alexh wrote:
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!

Just picked mine up from the post office:



I want the PCMCIA for the WLAN card, so I have to settle with "just" 6MB fast:

[alexh]

What company did you use to convert your money to russian?
What was the total price?

I have an email saying send the money.

[skurk]

My total price was 27.2 euros + 12 euros in shipping.   Google told me the price in US Dollars, which I transferred with Western Union.

Quite fast shipping, too.  Got it one week after I paid.

[alexh]

How much do Western Union charge?

I was going to sign up for http://www.wmtransfer.com/ but giving credit card details to Russian companies just doesn't come naturally to me :-)

[skurk]

WU charged me £10 for the transfer.  Quite pricey, but very fast.  I also had to call them to verify the transfer.

[alexh]

Nice to know.

I'm going to try MoneyGram (any major UK post office) as they want to charge £4.99 for any amount upto $100

[amigan24]

So has anyone from the US ordered one of these?

I wired my money and had the item sent (visual proof of postal receipt so the seller is legit) but according to the tracking it's *still* in Russia. I ordered in mid-November and it's either lost or just sitting.

Out of curiosity, what does one do in a situation like this besides wait?

[alexh]

That's a long time. Mine arrived within four weeks of posting but I was in the UK and it wasn't xmas. (Always a slow time for worldwide postage)

Get AcidRAIN to chase it up. I am sure he would help as much as he can. If you paid for insured postage he can start the claim procedure.

He's on ICQ regularly and is a nice guy.