fountain/interton rom Chipselect details by Gavin Turner 10:36 PM 5/22/2005



The ROM chips used in fountain ROM cartridges use three chip select pins,
this is so that more than one ROM can "banked" by use of the address lines.

       9316
A7   1 +-v-+ 24  Vcc
A6   2 |   | 23  A8
A5   3 |   | 22  A9
A4   4 |   | 21  CS/
A3   5 |   | 20  CS/
A2   6 |   | 19  A10
A1   7 |   | 18  CS
A0   8 |   | 17  D7
D0   9 |   | 16  D6
D1  10 |   | 15  D5
D2  11 |   | 14  D4
GND 12 +---+ 13  D3

You will need to know this in-order to dump a fountain game cartridge;
 
To enable chip-select:

looking at the ROM Cartridge edge connector 
with the game programmes label facing you
(pin 1 right front),(pin 16 left front)
(pin 17 left rear),(pin 32 right rear)
pin 6  ground
pin 15 ground
pin 20 Vcc



looking at rom chip itself connect:
pin 21 ground
pin 20 ground
pin 18 Vcc


I generated the address lines with a binary counter
part number MC74HC4040N controlled via the parallel port
power was supplied from the keyboard by an adapter connection


You will also need some software to control the binary counter
this will have to be approached differently depending on which
operating system you have, with Windows 95/98 you can use Qbasic
but if you are using windows Nt/Windows XP DOS/Qbasic/powerbasic
software wont work it will be impossible to tristate the data lines.

In this case you will need some VB software to tristate the
data lines. the VB software will be compatiable with the
early versions of windows(98 etc) making it the better
option all round.

