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Conference hydra::amiga_v1

Title:AMIGA NOTES
Notice:Join us in the *NEW* conference - HYDRA::AMIGA_V2
Moderator:HYDRA::MOORE
Created:Sat Apr 26 1986
Last Modified:Wed Feb 05 1992
Last Successful Update:Fri Jun 06 1997
Number of topics:5378
Total number of notes:38326

2199.0. "Amazing Computing Memory Hack??" by OTOFS::S_SCHMIDT (Stu Schmidt) Fri Feb 03 1989 19:59

    I know this is boring for all you rich A2000 owners but....
    
    I remember hearing something about an Amazing Computing A1000 memory
    hack that involved adding another 512K by soldering chips onto the
    mother board.  I finally have some chips, but am still too cheap
    to buy an insider.  Does anyone know where to find this article,
    and has anyone tried this hack?  Does it work? 
    
    Any info or advice would be gratefully accepted.
    
    Cheers,
    Stu
    
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2199.1AC V2,#1 1987MEIS::ZIMMERMANNinja turtles fight with honor!Sun Feb 05 1989 15:257
There was an article like that in AC Vol 2, #1, 1987.  (This was
before AC started putting real dates on their mags.)  The technique
involves soldering RAMs together to form RAM stacks, after first
cutting their little toes off.  Brrr, sounds scary!  Want a copy of
the article? 

- Cliff
2199.2More guts than brains...I'll try itOTOFS::S_SCHMIDTStu SchmidtWed Feb 08 1989 14:3811
    Indeed does sound a little chilling....but what the heck... major
    surgery never scared me off when I was working on other peoples
    computers.
    
    I'd love a copy of the article.
    
    For anyone else out there who may be crazy enough to try this, I'll
    post a report if I actually go through with it.
    
    Stu
    
2199.3I did this one a few years ago....TIOGA::santiagoDrinking deeply of the Pierian springMon Feb 13 1989 01:3022
..it came out great.  Still working fine these days.

One hint: Stay clear of NEC RAMs. I had a *lot* of trouble with
some, had to throw them away ($$ - ouch!).  It turns out they were
a bad batch, had different CAS/RAS timing. The date code on them 
was "L", so if you must go NEC be sure to avoid these.

There're also a few mods you can make to get it to work under 1.2+.
One of them involves latching on the drive LED, which is what I did.
I don't recommend it. But if you do go this way, be sure to put the
green LED in your console. One of the caps in the timing code (er,
circuit) doesn't discharge well and when powering off/on quickly
the circuit comes up enabled: Not Good. You have to keep power
cycling until the green LED is off on startup, and everyone knows
power cycling is a Bad Thing. Another way involves remapping the 
memory to $C0000000 with a few F parts, although I don't know how
well it works, it sounds much better than what I have.

PS I'm a software type, and that was my first exposure to a soldering
iron. It was that easy.

^E