Re: C64 IEEE interface

Hi,

The plus/4 KERNAL works inb the second way: it checks for a TCBM drive and
if it's not found then it assumes that it's an IEC drive.
2014.11.05. 19:35 ezt írta ( <Ruud@baltissen.org>):

> Hallo Steve,
>
>
> > I have two of these interfaces but not sure if they work or not.
>
> I have two that don't work :( I would expect at least a start up
> message but nothing at all.
>
>
> > ... plus the VIC-20 IEEE cart.
>
> I have this VIC-20 cart, two C64 an one VIC-20 DAMS carts, and four
> carts containing a EPROM, 6821, 74LS245 and a 7417. Of those four
> 6821 carts three didn't work: two because of a non-standard EPROM,
> one because of a brooken switch. All three worked fine with the
> EPROM of the first one.
>
>
> > Do you have some sort of project in mind?
>
> A member of our club bought a 8250LP and wanted to connect it with a
> C64 but didn't succeed because of a brooken interface. And I wanted
> to help him.
> Instead of using the EPROM on one of those carts, I want to have a
> Kernal with a built-in IEEE driver: the main reason I asked how I
> could check my Kernals without RS-232 and Cassette interface. And
> IMHO it would look great to use an original C64 cart. So I wanted to
> implement the routines of the original EPROM into the Kernal. But
> someone took a lot of effort to make sure it is very very hard to
> disassemble the bloody thing :( That's why I asked if the job
> already has been done.
>
> FYI: I disassembled and commented 95% of the 6821 interface
> disassembled a great part of the DAMS one and I'm also busy with
> IEEE Kernal of the 64'er project from October 1985. I also made
> schematics of the DAMS and 6821 interfaces. If interested, as ausual
> everything is for free!
>
> I want to be able to mix IEEE and IEC devices. And that just NOW
> pops up in my mind: if possible in combination with JiffyDOS (which
> means I have even more work to do).
> On possebility is to reserve a byte and using the bits to tell what
> device is or isn't IEEE. Another possebility, first check if a IEEE
> device is present and when not, assume it is IEC.
> Any ideas or comments are welcome!
>
>
> --
>
> Kind regards / Met vriendelijke groet, Ruud Baltissen
> www.Baltissen.org
>
>
>
>
>
>
>
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>


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