Commodore Pet ROM trouble... EPROM Substitutes...

From: Philip Pemberton <philpem_at_dsl.pipex.com>
Date: Thu Jul 22 15:17:12 2004

In message <10407221840.ZM22794_at_mindy.dunnington.u-net.com>
          Pete Turnbull <pete_at_dunnington.u-net.com> wrote:

> On Jul 22, 13:09, wolfgang_at_eichberger.org wrote:
>
> > 2732 2532
> > EPROM -> SOCKET
> > Pin(s) Pin(s)
> > 1-17 -> 1-17
> > 18 (E) -> 20 (PD/PGM)
> > 19(A10)-> 19 (A10)
> > 20(GVpp)> 21 (Vpp)
> > 21(A11)-> 18 (A11)
> > 22-24 -> 22-24
>
> That should certainly work for reading.
>
Not if those pin names are correct. !G is Output Gate, i.e. !OE. I'd connect
all the pins straight through, except 18, 20 and 21.

2532 socket 2732 ROM
18 A11 21 A11
21 VPP no-connect
20 !E (PD/PGM) 18 !E
14 Vss 14 and 20 (Vss and !G respectively)
Anything else is connected straight through

I *think* that'll work. The only difference is that this grounds the 2732's
!G (Output Enable) pin instead of rigging it high (Vpp is usually connected
to +5V for EPROMs that are wired for reading only).

Later.
-- 
Phil.                              | Acorn Risc PC600 Mk3, SA202, 64MB, 6GB,
philpem_at_dsl.pipex.com              | ViewFinder, 10BaseT Ethernet, 2-slice,
http://www.philpem.dsl.pipex.com/  | 48xCD, ARCINv6c IDE, SCSI
... A pound of puppies; a college of cardinals; a bowl of weevils
Received on Thu Jul 22 2004 - 15:17:12 BST

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