Re: Bell & Howell ][+ and lowercase characters

["Michael J. Mahon" <mjmahon@aol.com>]

David Wilson wrote:
> Michael J. Mahon wrote:
>
> > A machined-pin socket and some wire can be made into an adapter
> > to allow a 2716 to plug into the 2513 socket.  The same kind of
> > adapter is needed to replace any of the Monitor/BASIC ROMs.
>
>
> At least the Monitor/BASIC ROMs have all but 3 pins in common.
> A 2513 => 2716 adapter would have the following pinout:
>
> 2513 signal 2716/2316B
> 14 VA  8
> 15 VB  7
> 16 VC  6
> 17 DL0 5
> 18 DL1 4
> 19 DL2 3
> 20 DL3 2
> 21 DL4 1
> 22 DL5 23
> 4  O1  10
> 5  O2  11
> 6  O3  12
> 7  O4  13
> 8  O5  14
> 11 /E  18,20
> 24 Vcc 24,21
> 10 Gnd 12
> 1  Vgg n/c
> 12 Vdd n/c

Hmm--that's pretty bad!  That would take *two* sockets and,
preferably a small PC board.

I'm surprised that two such different 16K ROMs were used on the
same main board!

-michael

New, faster SUDOKU v2.0 solver for Apple II's!
Home page:  http://members.aol.com/MJMahon/

"The wastebasket is our most important design
tool--and it's seriously underused."