Questions about Pentagon128
ZXNet echo conference «real.speccy»
16 May 99 17:19, Roman Milukov wrote to Aleksandr Jarmakov:
AJ>> - what needs to be corrected in the circuit to achieve the correct
AJ>> INT signal duration ?
RM> Usually it is enough to replace capacitor C6, set it to 5600 pF (at
RM> R17=1K), and that’s it.
Depends on the microcircuit, temperature... By the way, a capacitor with the correct TKE
must be selected... It’s easier to make a purely digital shaper. Or put a variable
and then spin it.
AJ>> - how to implement the FF port?
RM> IMHO no one needs it now.
How about launching ancient games?
Kirill Frolov. [ZX]
KF> we need to select... It’s easier to make a purely digital shaper. Or
KF> put a variable
KF>, and then turn it.
In the INT driver, place a variable in parallel with the resistor, and
adjust the INT as it warms up (for a turbo, you don’t need to do this). If there is a strong drift with
warming up, the mikruha in front of the shaper changes. If your computer has a turbo, you can do something like Scorpio, without any capacitors
and resistors.
Regards, Alex from FFC COMPUTERS.
>E-MAIL: asde...@softhome.net ICQ: #13064553
On the day of AL> A variable is placed in the INT driver in parallel with the resistor, and /INT just needs to be returned to “1” by /IORQ or /M1. And if there is no confirmation ┌───┐ Wow! The Protoss are attacking my Zerlings! It's time to get going. Ivan...
AL> the INT is adjusted to warm up (for a turbo, this is not necessary). If there is a strong drift with
AL> warming up, the mikruha in front of the shaper changes. If
AL> the computer has a turbo, you can do something like Scorpio, without any
AL> capacitors and resistors.
of the interruption, then let it stand for ten microseconds, and then it will return to “1”
frame pulse ──║──┬─────┬─┤ o───── /INT
C │ ┌┴┐└───┘
┌───┐ │ R│ │
/IORQ ───┤ 1 │ │ └┬┘
/M1 ───┤ ├────┤<├──┴─┤<├─┤
└───┘ ─┴─
This is not simpler, but more complicated.
I once tinkered with this, adjusted it... But it works equally well,
if I kept within some fairly wide limits. This is all nonsense.
28 May 99 03:58, Ivan Mak wrote to Alex Letaev:
IM> ┌───┐
IM> frame pulse ──║──┬─────┬─┤ o───── /INT
IM> C │ ┌┴┐└───┘
IM> ┌───┐ │ R│ │
IM> /IORQ ───┤ 1 │ │ └┬┘
IM> /M1 ───┤ ├────┤<├──┴─┤<├─┤
IM> └───┘ ─┴─
In kai this is done on one 555IR16 chip.
Kirill Frolov. [ZX]
KF> Where is this done on one 555IP16 microcircuit.
Is it difficult to throw it in? Otherwise, Kai's scheme is not very bright.
Wow! The Protoss are attacking my Zerlings! It's time to get going. Ivan.
- Divorce the scheme, big and small.. [ Sprinter-II ] [Forth-CPU] [ZX]
... My new E-mail: ivan...@mail.ru
IM> And in Sprinter on two logical cells.
And this cockroach costs $7. And IR16 is many times cheaper.
Kirill Frolov. [ZX]
Wow! The Protoss are attacking my Zerlings! It's time to get going. Ivan.
- Divorce the scheme, big and small.. [ Sprinter-II ] [Forth-CPU] [ZX]
... My new E-mail: ivan...@mail.ru
IM> Yes? It turns out that Sprinter should cost at least $2000, if two
IM> logical cells cost seven. Or did you call Sprinter a cockroach?
I called “ALTER” a cockroach.
Kirill Frolov. [ZX]
02 Jun 99 11:09, Alex Letaev wrote to Kirill Frolov:
KF>> Where is this done on one 555IP16 microcircuit.
AL> Is it difficult to throw it in? Otherwise, Kai’s scheme is not very bright.
Kai’s scheme is classified.
And I won’t send anything via snail mail.
Kirill Frolov. [ZX]