From: David Wood (jbevren_at_starbase.globalpc.net)
Date: 2003-03-20 06:00:39
..or they laid it out in this manner to make it easier to design the
cartridge (no crossed wires or vias, for example). Either possibility isnt
all that uncommon.
-David
On Wed, 19 Mar 2003, Brian Ketterling wrote:
> Hi --
>
> I'm wondering whether anyone has a known-good pinout for a TI 2532 JL 4k x 8
> EPROM. I found the following one at:
>
> http://margo.student.utwente.nl/stefan/chipdir/pinusr/2532.txt
>
>
> +--()--+
> A7 | 1 24| Vcc
> A6 | 2 23| A8
> A5 | 3 22| A9
> A4 | 4 21| Vpp
> A3 | 5 20| /E, /Progr
> A2 | 6 19| A10
> A1 | 7 18| A11
> A0 | 8 17| D7
> D0 | 9 16| D6
> D1 |10 15| D5
> D2 |11 14| D4
> Vss |12 13| D3
> +------+
>
> This EPROM is on the board of my autostart Vizastar 64 cartridge. However,
> either the pinout above is wrong, or Viza intentionally jumbled up the lines
> (maybe as a scheme to keep people from reading/copying the ROM?). Using the
> pinout as a guide, the cartridge has these connections:
>
> EPROM EXP. PORT EPROM EXP. PORT
> ----- --------- ----- ---------
> A0 A1 D0 D5
> A1 A2 D1 D3
> A2 A3 D2 D1
> A4 A6 D3 D0
> A5 A8 D4 D2
> A6 A9 D5 D4
> A7 A11 D6 D6
> A8 A10 D7 D7
> A9 A7
> A10 A0 <Vcc> and <Vss> are as expected.
> A11 A5 <Vpp> goes to +5V. </E, /Progr> goes to /ROML.
>
> Thanks very much,
> Brian
>
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