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Author Topic: Increasing the number of ISA slots  (Read 2238 times)

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Offline blanningTopic starter

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Increasing the number of ISA slots
« on: December 02, 2014, 06:37:44 PM »
Has anyone tried one of these ISA bus expanders/extenders with a bridge board?

I bet the IBM 5161 will work with the a1060.

brian
 

Offline blanningTopic starter

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Re: Increasing the number of ISA slots
« Reply #1 on: December 03, 2014, 06:35:48 PM »
Quote from: JimS;778917
I used to have a board - I think it originally belonged in a Packard-Bell PC- that plugged into an ISA slot and had 3 ISA slots on one side and 2 on the other. I tried it in my A2000's farthest ISA slot and it did work... gave me 2 extra slots, since it took one and I could use the three on one side.... of course, those cards were hanging in mid air, and the case wouldn't go on. ;-)
 But it worked. ;-)

Many years ago, I had a 486 laptop for my university work.  It had a black and white LCD display which led to not enough video memory when I hooked it up to an external monitor.  It also had no way to attach a sound card.  So I bought the expansion chassis which included two ISA slots.  This allowed for an ISA video card and a sound card with a controller for a cdrom.  But there weren't any slots left for the 16550 serial board I needed for my 14.4 modem.  So I took the cover off the expansion chassis and plugged in the card you described.  "Hanging out in the air" was standing upright for me, so it worked ok.  I took power for the cdrom from another case with a dead 386 motherboard to appease the power supply.  I turned the whole mess on with a power strip and it worked perfectly.

I've often thought about what the "maximum configuration" for something like an A2000 would be like.  Plugging in a scsi controller for example would necessitate 7 drives.  Then one could plug in a buddha board for IDE goodness.  Then there's a deneb for USB, or the new rapid road thing.  Could I hook up all of these devices using an existing A2000 case in spite of the lack of drive bays?  Of course, such a machine would need a bridge board and an emplant board, CPU upgrade, 2mb chip ram/agnus upgrade, ethernet, sound, and whatever other goodness Jens cooks up.  This led to the question about ISA expansion chassis.  Because a 2000 doesn't have enough ISA slots for a video card, sound card, scsi card, ide card, and whatever other whacky things I could find, available IRQs aside.

Am I really the only retro computer fan out there that wondered what a PC that had a drive attached to every letter of the alphabet would look like?   lol

brian
 

Offline blanningTopic starter

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Re: Increasing the number of ISA slots
« Reply #2 on: December 03, 2014, 09:25:27 PM »
Quote from: spaceman88;778942
Yes, my Ambitious Technology 4000 tower has an Amiga 4000 desktop motherboard and a big board ( I think it was called "Big Bertha") full of ISA slots for TBC's etc.

BTW, having the motherboard mounted on it's side saved it from the dreaded NiCad. The battery had leaked, but the liquid dripped off the board on to the bare metal at the bottom of the case.

I believe the TBCs only used the ISA bus for power though.  I bet all the other lines weren't connected for some of those towers.

edit:

yep...    http://www.bigbookofamigahardware.com/bboah/product.aspx?id=1837