That's what I was thinking of doing, I had looked at a
picture of a C64 motherboard on wikipedia and it looks as
though the back of the IEC connector has all the pins going
to the motherboard installed. I could solder onto those
pins and keep the port.
I'm planning on keeping it drive 8 though, but that can be
changed on the device with a simple command anyways.
Dan
From: "Brian Lyons" <brian@xxxxxxxxxxx>
To: <torontocbm@xxxxxxxxxxxxx>
Subject: [torontocbm] Re: Bugged firmware uIEC's and Jim
Brain...
Date: Sat, 13 Dec 2008 18:12:52 -0500
----- Original Message Follows -----
Rather than just posting some speculation 8-|
I had a look at;
relevant section of 1540 schematic:
http://staff.washington.edu/rrcc/uwweb/1541early/1540-1.GIF
relevant section of 1541 schematic:
http://staff.washington.edu/rrcc/uwweb/1541/1541-1.GIF
relevant section of 1571 schematic:
http://staff.washington.edu/rrcc/uwweb/1571/c1571-b4.gif
relevant section of 1581 scheamtic:
http://staff.washington.edu/rrcc/uwweb/1581/3OF4.GIF
It is clear that 2nd serial port is merely directly wired
to 1st serial port jack.
Thus, a properly constructed Y cable should not present
difficulties on the serial bus.
----- Original Message -----
From: "Jeff Bourdeau" <jeffobourdeau@xxxxxxxxx>
To: <torontocbm@xxxxxxxxxxxxx>
Sent: Saturday, December 13, 2008 5:05 PM
Subject: [torontocbm] Re: Bugged firmware uIEC's and Jim
Brain...
>I thought I read something in Compute! or Compute!s
Gazette where that idea >was only good on a limited # of
devices using the Commodore Bus but many >devices wont
work properly if you try to setup a y-style of physical
>connection...but that was some time ago & perhaps the
info is outdated >now.....they commented on how the bus
inside, for example, the back of a >1541 is wired
differently and has supporting chips to keep the data
flowing >for each device properly which is what is needed
for true transparency & >compatibility.
>
> --------------------------------------------------
> From: "Leif Bloomquist" <leif@xxxxxxxxxxxxxxxx>
> Sent: Saturday, December 13, 2008 4:56 PM
> To: <torontocbm@xxxxxxxxxxxxx>
> Subject: [torontocbm] Re: Bugged firmware uIEC's and Jim
Brain... >
>> Daniel Kovacs wrote:
>>
>>> other thing I was thinking of was to solder to the
exposed pins on the >>> back of the port, but then would
it cause any damage to attach a drive >>> and the UIEC at
the same time? >>
>> This is what I was planning to do with my uIEC sometime
- install it >> inside my VIC-20 as an internal device
#10, but keep the external IEC >> port so I can still use
external drives at the same time. >>
>> In theory, this should work fine - it would be no
different than using an >> IEC "Y" splitter cable (which
do exist). But I haven't tried it. Could >> someone with
more electronics knowledge comment? >>
>> -Leif
>>
>>
>> --
>> Leif Bloomquist
>> leif(at)schemafactor(dot)com
>> http://home.ica.net/~leifb/
>>
>> "It's better to light a candle, than curse the
darkness." >>
>
>
