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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: mchaggis on March 05, 2010, 12:21:53 PM

Title: Strange A1200 Behavior.
Post by: mchaggis on March 05, 2010, 12:21:53 PM

Hi,

I'm looking for a way to solve my strange A1200 behavior.

I have a NetGear wireless PCMCIA network card and a Microbotics 8Mb + 68882fpu trapdoor card.

When the trapdoor card is plugged in, the network card will not work; remove the trapdoor card the network card works...

I have OS3.5 plus boingbags and cardpatch + cardreset in the user-startup.

Help wanted.

Title: Re: Strange A1200 Behavior.
Post by: spaceman88 on March 05, 2010, 12:48:07 PM

Quote from: mchaggis;546276

Hi,

I'm looking for a way to solve my strange A1200 behavior.

I have a NetGear wireless PCMCIA network card and a Microbotics 8Mb + 68882fpu trapdoor card.

When the trapdoor card is plugged in, the network card will not work; remove the trapdoor card the network card works...

I have OS3.5 plus boingbags and cardpatch + cardreset in the user-startup.

Help wanted.

Hi,
If I remember correctly some RAM expansions that go above 4Mb use the same address's as the PCMCIA slot, causing a conflict. This is likely what's happening.

Title: Re: Strange A1200 Behavior.
Post by: Tension on March 05, 2010, 01:00:50 PM

Quote from: mchaggis;546276

Hi,

I'm looking for a way to solve my strange A1200 behavior.

I have a NetGear wireless PCMCIA network card and a Microbotics 8Mb + 68882fpu trapdoor card.

When the trapdoor card is plugged in, the network card will not work; remove the trapdoor card the network card works...

I have OS3.5 plus boingbags and cardpatch + cardreset in the user-startup.

Help wanted.

That's not strange behaviour.  It's well documented behaviour.

Title: Re: Strange A1200 Behavior.
Post by: fitzsteve on March 05, 2010, 01:12:13 PM

As the others say this is normal, standard trapdoor ram upgrade will disable the PCMCIA slot when more then 5.5mb of ram is used.
 
You'll either need to disable some of the ram with a jumper setting on the card or use a 4mb simm.
 
Your other option is to get an accelerator card (such as a Blizzard 1230)that used 24bit memory addressing thus not conflicting with the PCMCIA port.
 
Steve.

Title: Re: Strange A1200 Behavior.
Post by: mongo on March 05, 2010, 01:23:27 PM

Quote from: fitzsteve;546282

Your other option is to get an accelerator card (such as a Blizzard 1230)that used 24bit memory addressing thus not conflicting with the PCMCIA port.

24 bit memory addressing is the problem. You need a accelerator card with 32 bit memory addressing if you want to use more than 4 meg with the PCMCIA port.

Title: Re: Strange A1200 Behavior.
Post by: scuzzb494 on March 05, 2010, 01:48:00 PM

The Blizzard 1230 Mk IV works. I have the Blizzard on my machine with a PCMCIA Network card, and other than the CardReset Tool that I need to fire the network card up it works a charm on Broadband.

http://www.commodore-amiga-retro.com/amiga/amiga_scuzz96.htm

http://www.commodore-amiga-retro.com/amiga/amiga_scuzz328.htm

scuzz

Title: Re: Strange A1200 Behavior.
Post by: tokyoracer on March 05, 2010, 02:55:05 PM

Quote from: scuzzb494;546284

The Blizzard 1230 Mk IV works. I have the Blizzard on my machine with a PCMCIA Network card, and other than the CardReset Tool that I need to fire the network card up it works a charm on Broadband.

scuzz

That would work as it's "PCMCIA friendly", I have one myself too.

I also have one of these FPU/RAM cards the guy speaks of and you have to peg it back to 4Mb (via jumpers) for the PCMCIA slot to function.
It's annoying but 4Mb fast should be more then enough for any classic Amigan. :)

Title: Re: Strange A1200 Behavior.
Post by: fitzsteve on March 05, 2010, 03:37:30 PM

Quote from: mongo;546283

24 bit memory addressing is the problem. You need a accelerator card with 32 bit memory addressing if you want to use more than 4 meg with the PCMCIA port.

Sorry sounds like I got that back to front... :hammer: