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   Re: C128 Tower Question  more options
   
   
   Author:   Nicolas Welte
   Email: welte@chemie.uni-konstanz.de
   Date: 1999/01/14
   Forums: comp.sys.cbm
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John Hoepker wrote:
> 1). What must be done to fix that awful sounding SID on the 128DCR?

Put in your old SID. You have to do some other modifications, it's all
described in the 128DCR schematics at funet. Another option, if you just
want to have the digi sound back, is to add a certain resistor. Read all
about it here, but I never tried it myself:
http://www.student.informatik.tu-darmstadt.de/~mjk/
nepa/tuning/increase_digitalvolume.html

(Sorry for the linebreak)

> 2). Will the face pannel from a 1541C drive with Newtronics mechanism fit
>     the Newtronics mech from a 1571? I'm not thrilled with the thought of
>     fabricating something to fill in.

Just from looking at the drives, I'd say yes. I was rather playing with
the idea of putting a 1571 mech into a 1541-II case, which should be the
same problem. But again, I never tried it.

> 3). Is the circuit board from the 1541C smaller than the older one(s)? If
>     so, will it function with the Alps mechanism? If so, is it 100%
>     compatible with fastloaders and copy protection? I'd like to keep the
>     1541 an Alps mech to distinguish it from the 1571. Besides, that old
>     mech sitting in a tower looks so unique....

There are several versions of the 1541C: with normal sized board, with
the new board, with Alps drive and with Newtronics drive. The normal
sized board has to be configured with a jumper to match the drive, I
don't know about the small, new board. But I once put a Newtronics drive
(without knowing about this difference) into a 1541 that formerly had an
Alps drive and it worked. So I'd just give it a try. BTW, the 1541-II
board is even smaller.

> 4). How far can one extend the keyboard (assuming good shielding) without
>     encountering trouble?

Shielding is not a problem, its the capacitance of the cable. If the
cable is too long, the interface lines of the CIA will be stressed too
much. I once used a 1m extension and had no problems.

> 5). Where does one connect switches to the DCR motherboard to change
>     device number or disable it?

There are two jumper pads in the drive section just under the drive
mechanism. Should both be easy to spot. Disabling it completely is more
difficult, someone in this group once posted the procedure which
involved cutting a copper trace on the board and/or some IC legs.

Nicolas
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