TT030 Catch Computer CCMeg TT

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firyembers
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TT030 Catch Computer CCMeg TT

Postby firyembers » Wed Jan 28, 2009 10:50 pm

Hi
I am playing with a TT ram board,it will take up to 128mb,8 simm slots,and trying to work out combination of switches on the left,anybody have an old manual or sheet with specs,
Thanks
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Re: TT030 Catch Computer CCMeg TT

Postby BoNuS » Tue Feb 03, 2009 10:10 am

Impressive :) Would like to see this one working with 128Mb...
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( I have just to much Atari stuff)

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Re: TT030 Catch Computer CCMeg TT

Postby jvas » Tue Feb 03, 2009 12:19 pm

firyembers wrote:Hi
I am playing with a TT ram board,it will take up to 128mb,8 simm slots,and trying to work out combination of switches on the left,anybody have an old manual or sheet with specs,
Thanks


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Last edited by jvas on Wed Feb 04, 2009 8:54 am, edited 1 time in total.

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Re: TT030 Catch Computer CCMeg TT

Postby [ProToS] » Wed Feb 04, 2009 12:24 am

I don't found the doc from my MegTT board, found this copy on the cnc hyp

Die MegTT RAM Karte
Image

Code: Select all

Auf der MegTT sitzt in einer Version zwei Bausteine des Typs 74LS57,
   da diese Bausteine mittlerweile nicht mehr hergestellt werden, hier
   kurz die Informationen dazu:

        QC      QB      CLR     CLKA
         8       7       6       5
    +-------------------------------+
    |    |       |               |  |
    |   1:2      |               |  |
    |    |       |               |  |
     \   o-------+             1:6  |
     /   |                       |  |
    |   1:5              +-------+  |
    |    |               |          |
    |    |               |          |
    +-------------------------------+
         1       2       3       4
       CLK B    Vcc      QA     GND

   PIN  FUNKTION
    1 - Clock1     5 - Clock2
    2 - VCC        6 - Clear
    3 - 6:1        7 - 5:1
    4 - GND        8 - 10:1

   Da dieser Baustein drei verschiedene Teiler enthält, lassen sich
   fünf mögliche Teilerverhältnisse erzielen, und zwar 5:1, 6:1, 10:1,
   30:1 und 60:1. Der Baustein besitzt zwei seperate Takteingänge
   Clock1 und Clock2. Die Triggerung erfolgt beim HL-Übergang (negative
   Flanke) des Taktes. Die Löschfunktion(Clear) ist aktiv High und un-
   abhängig vom Zustand der Takteingänge. Der Baustein ist auch unter
   der Typennummer 49711 in Standard-TTL erhältlich.

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Re: TT030 Catch Computer CCMeg TT

Postby Beetle » Wed Feb 04, 2009 10:19 am

What RAMs do you have to test the MegTT?

From my experience (i have one in my TT, too) the MegTT is a bit picky.

The easiest was to use 8-chip 1MB SIMMs. That always worked.
3-Chip 1MB SIMMs didn't work for me; i only had few to test, though.

Of course i wanted more than 8 MB TT RAM.

After purchasing some SIMM lots on eBay i found 8 4MB SIMMs
that work nicely, but i had to place them in special order.

I had 2 different brands of RAMs, and i needed to place brand a
in the upper 4 slots, and brand b in the lower 4 slots to make them work.
Otherwise, memory test might have many X or even wrong amount displayed.
Until now, i wonder about this one. I thought same brands should go in same bank.
P1050087.resized b.JPG


Greetings,
Beetle

PS: At a sceneparty in czech republic (hey folks!) i got hold of 4 x 16 MB SIMMs
I didn't get them to work reliably. At that time, i didn't have the special placement
trick figured out already.
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Re: TT030 Catch Computer CCMeg TT

Postby [ProToS] » Wed Feb 04, 2009 11:52 am

as for me I never use my MegTT perhaps they don't work.
I use a magnumTT with 256MB ttram.
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Re: TT030 Catch Computer CCMeg TT

Postby Beetle » Thu Feb 05, 2009 12:43 am

Well,

as for me I always use my MegTT because it works great. :cheers:
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Re: TT030 Catch Computer CCMeg TT

Postby firyembers » Thu Mar 12, 2009 11:59 pm

Hi Protos
Thanks for picy,much appreciated,i eventually came to the same conclusion.....with the dip switches,

The reason i went through this process was sometimes it would see 128mb and boot ok,other times it would crash,since i also have a 32mb cc memory board trying that never had a problem..

I am using 16mb 3 chip i think i am not at home,in venuzuela working,anyway i was studying the board for pcb damage etc when i noticed the ram chip on one simm was damaged,the pins were flattened slightly.
A bit more looking i realised these simms are taller than most and it actually fouls the bottom of the floppy drive case and the head of one of the screws was causing the damage and a short occasionally,because i have the top case not fastened down since i am in and out recently.
I have pictures which i will post,the solution i came up with remove the offending screw and insulated the the bottom plate with duct tape...
Since then no further bother and runs up 128mb no bother every time
DSC02208a.JPG

DSC02210a.JPG


The German to English for the CCmeg TT document
Dipswitch 4 changes the timing (meaningful for the Atari TT030)
Dipswitch 5 and 6 change the refreshrate (never both in the same position!)
Dipswitch 7 is not occupied
Default 4 and 5 on off and 6 on
Note: During the neurons execution megtt there are only the first four more dipswitch (allocation resembles)!

And for 74LS57,

On the MegTT sits in a version of two components of the type 74LS57, since these components are not meanwhile any longer manufactured, here briefly the information in addition:
Since this component contains three different divisors, five possible divisor conditions can be obtained, 5:1, 6:1, 10:1, 30:1 and 60: 1. The component possesses two September-guessed/advised clock inputs Clock1 and Clock2. Triggering takes place with the HL-transition (negative flank) of the clock. The delete function (CLEAR) is actively High and un dependant on the condition of the clock inputs. The component is available also under the model number 49711 in standard TTL.
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Re: TT030 Catch Computer CCMeg TT

Postby dexterslab » Wed Apr 22, 2009 10:40 am

is everyone ok with this now, as i should still have the original docs in german and english somewhere

mine was a bit picky about which simms it liked, thankfully someone gave me an old Sun Sparc machine that had 8 identical 4Mb SIMMs in it which worked perfectly in the MegTT


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