AY vs offtopic.

Connected AY-k via a parallel port to the offtopic.

There is a glitch - when reading volume registers, FF is read from them, if
the numbers 0,1,2,4,8 are written in them; otherwise it reads normally.
In real life it reads normally.

Bye...

VA> There is a glitch - when reading volume registers, FF is read from them, if
VA> the numbers 0,1,2,4,8 are written in
VA>; otherwise it is readable normally.
VA> In real life it is readable normally.
why all this is needed is not clear;( You take almost any emulsion and an aylpt circuit and
enjoy life. There is no need to read from ay ports through hardware, the ports are already
already in the emulsion...

JTN/4D

VA>> FF, if they contain the numbers 0,1,2,4,8; otherwise
VA>> is read normally. In reality, it reads normally.

VK> why all this is needed is not clear;( You take almost any emulsion and circuit
VK> aylpt and enjoy life.

The only problem that remains is how to connect the circuit you specified to another offtopic
(not PC, but Amiga).

VK> There is no need to read from ay ports through hardware, the ports are already there in
VK> emulator...

And I don’t argue. Another thing is that you need to read, for example, to check the presence of
AY in general.

PS: sorry for the late answer, there was a problem with echoes...

Bye...

VA> And I don’t argue. Another thing is that you need to read it, for example, to check the presence of
VA> AY in general.
why? well, or use lines like the end of the paper and some other things, 4 bits
will definitely be typed, although some will be inverted

VA> PS: sorry for the late answer, there was a problem with echoes...
np

JTN/4D

VA>> availability
VA>> AY in general.
VK> why? well, or use lines like the end of the paper and some other ones,
VK> 4 bits will definitely be typed, although some will be inverted

Well, why use any other lines if we just make a normal
reading circuit from it and write/read for testing - maybe when
we want to read something else - you never know. And he’s a capricious bastard - he doesn’t want
to read - maybe someone has encountered this in real life (the reading scheme is definitely
proper - rechecked several times).

ps. vader is not available yet - I answered for him.

Bye...

WBR, fyrex.

AL> Well, why use any other lines if we just make a normal
AL> scheme for reading from it and write/read for testing - maybe when we want to read something else
AL> - you never know. But he’s a capricious bastard - he doesn’t want
AL> to be read - maybe someone has encountered this in real life (the reading scheme is definitely
AL> correct - it’s been rechecked several times).

What does it mean that the scheme is correct and how is it checked if it can’t be read?
;)

JTN/4D

VK> hmm, in general, according to the standard, initially lpt was unidirectional, but on the PC in
VK> BIOS you can select ucp and something else, it is quite likely that in the Amiga something
VK> similar, i.e. first you need to program the port to read and then
VK> to read...

There is no one-sidedness - the port is bidirectional by definition. This is also
checked - when switching to read mode from it, a high impedance seems to be
set at the pins.

06 Sep 02 20:31, Andrey Lysenko wrote to Vassili Klimov:

AL> I agree, I can’t guarantee 100% - however, everything points to some
AL> problems with coordinating signal levels ami - ay!

And plug AP6 between AY and LPT try it.