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 > > _________________________________________________________________ > STOP MORE SPAM with the new MSN 8 and get 2 months FREE* > http://join.msn.com/?page=features/junkmail > > > Message was sent through the cbm-hackers mailing list > Message was sent through the cbm-hackers mailing list
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