RAM
ZXNet echo conference «zx.spectrum»
Hello Tyukaev Eugene Vladimirovich! In a message of 24 Feb 98 Tyukaev Eugene Vladimirovich wrote to All:
>> What does this signal do, and where is it formed?
TEV> in general, when the processor reads from RAM, this signal flies to 1 and is triggered
TEV> WAIT until the processor reads it.
TEV> Well, do you have any ideas?
I don’t have any. It’s generally difficult to disable WAIT, there will be glitches. If only
you try to increase the memory frequency together with the combination multiplexers. But it
will be cumbersome. And maybe your memory is running short.
TEV> you didn’t turbocharge Leningrad?
Nope.
Regards, Alex from FFC COMPUTERS.
>e-mail: as...@usa.net
Hi Alex Gofman!
> Hello Tyukaev !
>
> Fri Feb 20 1998, Tyukaev Eugene Vladimirovich writes to All:
>
>
> TEV> interested in the following question: the turbocharger circuit uses
> TEV> RAM signal where can I get it in Leningrad1?
>
> 2AL>> it seems like you are with the Leninists my friend, it will help if you know
>
> It looks like this signal is taken in Leningrad from the circuit in which
> ROM and RAM sampling signals are formed - signals A14 and A15 are mixed on it, I’ll look at the
> circuit - I’ll say for sure (now there is no circuit nearby).
I’m waiting with looking forward!
Eugene
The /RAM or probably /CSRAM signal is generated on 6 pins. element D12.2 (LA3), on
5 pins. which receives a signal from pin 10. D10.3 (LE1), the inputs of which receive signals /MREQ and /RD, and 4 pins. D12.2 receives the /RDROM signal
formed at D12.1, the 3rd input of which receives the signal from D10.3, and the 4th pin
signal from D10.4 to the inputs of which A14 and A15 are supplied (see below)
A14 ____
----| 1 | ____
A15 | o------------| & |
----| | | o------------------ /RDROM
---- -------| | |
| ---- |
| _____________|
| |
| | ____
/MREQ ____ | ---| & |
------| 1 | | | o---------------- /CSRAM
/RD | o---- -----| |
------| | ----
----
$$$ With best wishes ... Alex
Hello All !
I heard that there is a certain scheme that allows you to work with memory over 128k both on the Pentagon and on Scorpio. Is there such a miracle? If there is, leave the diagram,
plz :)
> >> ROM and RAM sampling signals are generated - signals A14 and
> are mixed on it >> A15, I’ll look at the circuit - I’ll say for sure (there’s no circuit nearby right now).
>
> The /RAM or probably /CSRAM signal is formed on 6 vyv. element D12.2 (LA3), on