(C) 1997 DANIIL
On completion the computer Scorpion ZS 256.
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In this article I will tell you about
small improvements computer "Scorpion
ZS 256 ".
Everyone has long known that the firm "Scorpion"
released a new fee turbo +, N / O even so,
There are many people who have "old" board on this machine.
Discussed in this article will be discussed is the "old"
Scorpio (because the owner of those is me!). The newspaper
"ON-LINE" # 11, as well as the "ZX-REVIEW" number 04/05 for
1996 was published wiring diagram AY. After this revision
should play Digitization Mouzon, and also work correctly editors
"DIGITAL STUDIO" and "INSTRUMENT". All as
say, OK, here is interpretation of the above
publications at the end of the following is written (quote
verbatim): "In" buggy "computer work with our
scheme (which has a very small percentage of probability)
should change the signal IORQGE on IORQ. "unquote.
Now I will openly declare
that this scheme will fail with 100% probability, in
particular, will not work F.I.R.E., ALICE demo, etc.
The thing is that this scheme is flawed because it does not
take into account the cycle interrupt confirmation Z80. During
this cycle processor nimenuemo will "contaminate" the data bus
(ie, at the time of interruption on it will not # FF!). And I
would like to mention the fact that This bug will only occur
If the interrupt vector I will be in the range # C0-# FF.
And now, not to be unfounded, I
give an outline of refinement, in which this
bug does not exist:
(C) 1996 DANIIL / PLAYGEAR.
Revised scheme for AY Scorpion ZS 256:
Unused item D3.1 chips
LL1 can be used in refining "disconnector port # 1FFD"
published in ZX-Format # 1 (legs 1,2,3).
This revision is installed on my
Scorpio, no glitches not identified! Chips are mounted on the
free space on the board (if you still have ...), all
connections are wire. Probably not worth mentioning that the
shorter wire is better! Owners pay Turbo + worries do not have
such a scheme implemented by the company.
Now a few words about the disconnector # 1FFD. Like I said,
the scheme of his published in the ZX-Format # 1, again all
OK, only the marking circuits shown
for older motherboards. I would like to give the corresponding
notation for the new cards turbo +:
turbo-turbo +
D49 D47
D53 D52
D52 D45
Finally, another useful information
concerning the old boards. If you have erased
the marking of chips on the motherboard, then I'll show you how
to find them:
D52
AY-8910 D53
D49
about
It's all about what I wanted to tell in this section of the
first issue DEJA VU, naturally in subsequent issues, we will
continue the theme of hardware and try to give attention not
only Scorpion'am. In addition, we would be happy to receive
information from you, uzhazhaemye readers. Send us your stuff
and we will gladly publish them.
END ...
