up to 1Mb
ZXNet echo conference «hardware.zx»
Hello, All
I decided to expand L-1 or L-2 to 1Mb. On SIMM. Expansion schemes came across
several. Those. looking at the Pentagon1024SL, an expansion scheme based on
scheme 512 from V.M.G., found it difficult to choose. In the first case, also reading ports
extensions are used. Is it necessary? In the second case, the scheme is based on
unknown to me expansion scheme to 128, not the one in the ZX-Review. Where
look at this "other" diagram 128?
Hello, Mikka_A
Yes, the second scheme is the same one that Caro converted to word for you. It says:
> Leningrad modification "memory expansion up to 128k".
> This means exactly the one in which CAS is managed
> using KP11 and LA3.
The only diagram (without any 556PT4) that I know is in the ZX-Review,
which I once used several times. There KP11 and LL1 on CAS are used.
From the attached archive:
> * it is recommended to apply for the 15th leg of KP11 (upgrade to 128K)
> the ground, having first freed it (the leg) from H1
> * it is recommended to remove resistors from the 9th and 12th legs of the same KP11.
In the zx-review on the 15th leg it’s the ground, not H1. And on legs 9 and 12 there are no
resistors.
So I’m asking, what kind of circuit is there for 128? :v2_blink;
Ha; I'm attaching both archives just in case, even though they flew by here.
File: SIMM_1M.ZIP http://zx.pk.ru/attachment.php?attachmentid=4467
File: Leningrad128.rar http://zx.pk.ru/attachment.php?attachmentid=4468
Hello, Ivan
> The only scheme (without any 556PT4) that I know is in
> ZX-Review, which I once used more than once. There are KP11 and LL1
> is used on CAS..................
You've got me in trouble...
you'll have to go to the old apartment, dig out your spec 128 with beta, and look at
what is collected there.
but it seems like from memory you’re right - that circuit is for 556PT4....
but I'll take a look when I get the chance...
Hello, Ivan
> I decided to expand L-1 or L-2 to 1Mb. On SIMM. Expansion schemes
> I came across several. Those. looking at the Pentagon1024SL, at the diagram
> extension based on the 512 circuit from V.M.G., found it difficult to choose.
> In the first case, reading expansion ports is also used.
> Is it required? In the second case, the scheme is based on an unknown
> I need an expansion scheme to 128, not the one in the ZX-Review. Where
> see this “other” diagram 128?
throw the second scheme at me, I’ll compare it with what I have...
Hello, Ivan
> I decided to expand L-1 or L-2 to 1Mb. On SIMM. Expansion schemes
> I came across several. Those. looking at the Pentagon1024SL, at the diagram
> extension based on the 512 circuit from V.M.G., found it difficult to choose.
> In the first case, reading expansion ports is also used.
> Is it required? In the second case, the scheme is based on an unknown
> I need an expansion scheme to 128, not the one in the ZX-Review. Where
> see this “other” diagram 128?
Here is a diagram for expanding my Leningrad-1 to 1024kb on port #7ffd, as well as in
lotion scheme
such as 512 pixel mode, color per byte, etc. Well, in general, you’ll figure it out. That’s all I have
works great now
several years. I also have an IDE controller on this computer according to the HEMO scheme and
turboFM.
File: My Leningrad-1024SL.rar http://zx.pk.ru/attachment.php?attachmentid=4531
Hello, p@lex
Thank you very much! For the first time I see a diagram that shows everything as a whole, and not several
small "fixes". Respect.
I also had a question: what is “SL” (aka “SL”) in the designation that
Pentagon, what in this case is Leningrad?
Hello, Ivan
> Thank you very much! For the first time I see a diagram where everything is shown as a whole, and not
> several small "fixes". Respect.
> I also had a question: what is “SL” (aka “SL”) in the designation
> what is the Pentagon, what in this case is Leningrad?
Don’t pay any attention to SL. Perhaps so. The entire circuit is mine
own development. Everything has been tested and works great.
Hello, Ivan
> Thank you very much! For the first time I see a diagram where everything is shown as a whole, and not
> several small "fixes". Respect.
> I also had a question: what is “SL” (aka “SL”) in the designation
> what is the Pentagon, what in this case is Leningrad?
SL indicates the presence of ZX-BUS slots (in my Pentagon), and in Leningrad -
I have no idea.
Hello KingOfEvil
Kin> SL denotes the presence of ZX-BUS slots (in my Pentagon), and in
Kin> Leningrad - I have no idea.
My Leningrad also has a system bus. I have 4 slots. Address bus
buffered. But there is no data bus. This can be seen from my diagram. Nevertheless, these slots
I have enough data without buffering. The slots are used as follows
way: 1-disk drive controller, 2-IDE controller, 3-Campston mouse, 4-sounddrive
1.51+ or under the prosko programmer.