From: Brian Ketterling (tweel8502_at_hotmail.com)
Date: 2003-03-20 00:38:36
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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