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Mats
 Post subject: Spare sockets CBM8032
PostPosted: Sun Aug 13, 2006 9:55 am 
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Joined: Sun Aug 24, 2003 7:17 pm
Posts: 111
On my CBM8032 I have found two free sockets (24 pins) positioned in the row of 901465 ROMs. I assume they were intended for EPROMs! If yes it must at least at some time have been manufactured fitting EPROMs. Does anybody know anything about this? And even if no such EPROMs are known, what is the pinouts of these free sockets? I would then make an adapter to an existing EPROM.
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blackadder
 Post subject:
PostPosted: Sun Aug 13, 2006 5:45 pm 
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Joined: Mon Mar 20, 2006 2:03 am
Posts: 24
There's a schematic here:
http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/pet/re/

If you just get a blank image save it and open in an image editing program, for some reason it didn't display properly online for me, but I was able to see it by doing that. Looks like all 2332 ROMS except for UD7 which is a 2316.
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Ruud
 Post subject:
PostPosted: Mon Aug 14, 2006 10:40 am 
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Joined: Fri Dec 12, 2003 7:22 am
Posts: 259
Location: Heerlen, NL
blackadder wrote:
Looks like all 2332 ROMS except for UD7 which is a 2316.


FYI: the 23xx ROMs can be replaced by 25xx EPROMs.

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Mats
 Post subject:
PostPosted: Mon Aug 14, 2006 11:52 am 
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Joined: Sun Aug 24, 2003 7:17 pm
Posts: 111
.and in addition there exists an adapter to make the 2332/2532 sockets accept a 2732 EPROM, see

http://www.marcospecialties.com/Itemdes ... 00&eq=&Tp=
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blackadder
 Post subject:
PostPosted: Mon Aug 14, 2006 4:54 pm 
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Joined: Mon Mar 20, 2006 2:03 am
Posts: 24
There might be some differences in the chip selects

http://arcadearchive.org/pinball/sys80/

I'll have to look and see what the exact differences between the 2332, 2532, and 2732 are when I get some extra time..
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Mats
 Post subject:
PostPosted: Wed Aug 16, 2006 8:35 am 
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Joined: Sun Aug 24, 2003 7:17 pm
Posts: 111
I think this is the definite answere:

Code:
       2532 (and 2332)             2532 socket in              2732
       4kx8 EPROM.                 CBM8032                     4kx8 EPROM

       +--------------+            +--------------+            +--------------+
    A7 |1    +--+   24| VCC     A7 |1    +--+   24| +5 V    A7 |1    +--+   24| VCC
    A6 |2           23| A8      A6 |2           23| A8      A6 |2           23| A8
    A5 |3           22| A9      A5 |3           22| A9      A5 |3           22| A9
    A4 |4           21| CE2     A4 |4           21| +5 V    A4 |4           21| A11
    A3 |5           20| /CE1    A3 |5           20| /SELx   A3 |5           20| /CE1
    A2 |6    2532   19| A10     A2 |6    2532   19| A10     A2 |6    2732   19| A10
    A1 |7           18| A11     A1 |7           18| A11     A1 |7           18| /CE2
    A0 |8           17| D7      A0 |8           17| D7      A0 |8           17| D7
    D0 |9           16| D6      D0 |9           16| D6      D0 |9           16| D6
    D1 |10          15| D5      D1 |10          15| D5      D1 |10          15| D5
    D2 |11          14| D4      D2 |11          14| D4      D2 |11          14| D4
   GND |12          13| D3     GND |12          13| D3     GND |12          13| D3
       +--------------+            +--------------+            +--------------+


where /SELx is an output line from a 74154 address decoding chip being low for one combination of A15,A14,A13,A12, otherwise high.

Required adapter:

Code:
      Socket          2732

      12              12 and 18
      18              21
      21              n.c.
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Mats
 Post subject:
PostPosted: Sat Sep 02, 2006 9:40 am 
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Joined: Sun Aug 24, 2003 7:17 pm
Posts: 111
I finally made the adapter as
Code:
      Socket          2732

      18              21
      20              18 and 20
      21              n.c.

to avoid crossing over between the left and the right hand side of the socket. Works fine!

To get the "professional adapter"
http://www.elektor.de/Default.aspx?tabi ... 0759&PN=On
seems to be difficult. Anyone knows if they still are on the market. "Pin-ball" arcades seems to be out of stock! No more manifactured?
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Brian_Lyons
 Post subject:
PostPosted: Mon Sep 18, 2006 5:07 pm 
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Joined: Sun Nov 28, 2004 3:21 pm
Posts: 14
Location: Toronto, Canada
Mats wrote:
Anyone knows if they still are on the market. "Pin-ball" arcades seems to be out of stock! No more manifactured?


I think the 2532 eprom was discontinued long ago.

http://www.sayal.com/ has these in stock.

Or, send me a PM. I have a very spare 2532 eproms from pulls.
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