[torontocbm] Re: Jim Brain! Help please!
- From: Jim Brain <brain@xxxxxxxxxx>
- To: torontocbm@xxxxxxxxxxxxx
- Date: Thu, 30 Dec 2010 20:37:43 -0600
On 12/30/2010 8:00 PM, rob.adlers@xxxxxxxxxx wrote:
Jim,
I finally have gotten to trying to install the JiffyDos chips I got from you,
but I have a problem.
I have one chip labelled 1541 DOS which is a 24 pin and the socket on my 1541C
drive is 28 pin. Then I have. Another chip that is a 28 pin with no label and
that's not a match for a non V4 motherboard on my C64C.
The 1541 chip board has 2364 written on it.
The other chip board has 23128-23512.
My understanding is the 1541 chips should be all the same yes? Why is it the
wrong size?
Or should the labels have been swapped out?
There are two different sizes of 1541 ROM. The 1541 and the early 1541C
units use a 24 pin ROM, while the later 1541C and the 1541II use a 28
pin ROM.
The 64C also has two sizes. Some 64C units used the old board, with a
24 pin ROM, while others used a 28 pin ROM.
It sounds like your 1541C uses a 1541-II ROM (28 pin). And then you
have a 24 pin ROM on the 64C. Pics are always useful to confirm
Also the 1541 chip has the wires soldered to pins 1 and 8.
The one on the 1541, or the JiffyDOS ROM?
The other board has them wired to 1 and 2.
Again, which ROM are we talking about?
So which chip is which and do I have the right set?
It sounds like you have the exact opposites of what you need :-)
Sent from my BlackBerry device on the Rogers Wireless Network
--
Jim Brain, Brain Innovations
brain@xxxxxxxxxx
www.jbrain.com
www.jbrain.net (eStore)
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