[torontocbm] Re: Bugged firmware uIEC's and Jim Brain...
- From: "danielkovacs" <danielkovacs@xxxxxxxxxxxxxx>
- To: torontocbm@xxxxxxxxxxxxx
- Date: Sat, 13 Dec 2008 22:59:20 -0500
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 info is outdated 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." >>
> >
> >
>
>
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