ncoplin_at_orbeng.com
Date: 2003-09-25 04:03:05
Hi Richard,
My guess it uses 44256chips, thus it is a 1MB expansion. Strange though that
it ties all the lines together except for the data lines... normally the
designers would tie the data together and rely on the /OE to avoid bus
contentions... someone may need to confirm this.... I couldn't find any
other DIP RAMs would fit the pinouts.... 44256 chips can be found on old VGA
PC video cards....
- Nick
44256, 44258
256kx4 DRAM.
+----------+
D0 |1 +--+ 20| GND
D1 |2 19| D3
/WE |3 18| D2
/RAS |4 17| /CAS
|5 44256 16| /OE
A0 |6 44258 15| A8
A1 |7 14| A7
A2 |8 13| A6
A3 |9 12| A5
VCC |10 11| A4
+----------+
[This information is part of the GIICM]
-----Original Message-----
From: Richard Lagendijk [mailto:r.lagendijk@hccnet.nl]
Sent: Thursday, 25 September 2003 1:27 AM
To: cbm-hackers@cling.gu.se
Subject: Re: C65 RAM Expander
RE: C65 RAM ExpanderI've uploaded a picture of my C65 Ram Expander to:
http://home.wanadoo.nl/cip/C65RAMExpander.jpg
I took my multimeter and found out that the pins 3 to 9 and 11 to 17 are
connected to each chip on the same pins
Pin 10 is the VCC and pin 20 is the GND
Could this help?
Greetings Richard
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