TURBO or not TURBO?!
ZXNet echo conference «zx.spectrum»
Hi Roman Milukov!
> Hello, Eugene!
>
> 18 Feb 98 Andy Harchenko hoping that Tyukaev Eugene will read,
> wrote:
>
> TV> I have pent512 I want to listen to MODs, I made a turbo according to the VMG scheme
> AH> ^^^^^^^^^^^^ I have it the most.
> Me too.
this is just wonderful!
let's then focus on the speed given out in Gemini Commander
I think if I'm not mistaken - 95 thousand!
> TV> according to the RamDoctor test: 71680-71684 after
> ^^^^^^^^^^ But I don’t know that. :(
cool thing! I’ll give you one of these days!
> TV> turbo: 88xxx-940xx why so little??? and how to make
> TV> more?
> AH> I have 102xxx
> Yeah, I have so much Gemini Commander shows.
yeah, that’s it, it shows less for me!
> But in ZX-FORMAT or 4, or so, there was some kind of Benchmark test (or whatever
it was called there?) shows 140% for RAM. For the Pentagon, turbocharged according to the V.M.G scheme, as far as I know, this is the norm.
I’ll have to look and check...
> Or maybe there are other turbocharger schemes, with greater displacement?
maybe. :-\
> TV> Did you use 555 series? Please help!
> AH> Perhaps the series, I had it before, but with turbo
> AH> the screen was decomposing.
> AH> Then I replaced it with 1533, now everything is greatit works.
> Well, this doesn’t affect the speed, IMHO. It either works or it doesn't. Speed
> depends on the circuit design.
that's it! and it also depends on this damned RAM signal!
> AH> And also try changing the processor
> AH>, it might help.
> But this is the right advice. From my experience, on a sophisticated Spec, with turbo, etc. Z8400A _GOLDSTAR_ work best.
I also have the same one only without the GoldStar inscription =)
> Although the speed will not increase, it will just work very stable.
It’s still stable for me! :)
>
>
> All the best.
> Sincerely, Roman Milukov.
Eugene\CrB\PhT
Hallo Eugene!
Tuesday February 24, 1998 18:38, Tyukaev Eugene Vladimirovich wrote to All:
>> TV> “maybe” doesn’t work, it’s still a percentage! after all, 40 legs!
>> TV> but in general, in fact, the z80H should not be stupid :)
>> 40 legs, this is of course good. But different companies produce different processors
TV> about 40 legs, I meant that it would be difficult to change, and I also want to keep
TV> him alive :)))
Is it difficult to change a “centipede”? ;)
Now “normal” processors have under 200 legs, nothing, they change...
>> time diagrams of signals. As a result, some circuits are “not indifferent” to the type of processor...
>> Tested in a real circuit.
TV> I have a certain z8400ba
TV> Z80ACPU
TV> that’s all that is written about it, and who the manufacturer is unknown,
TV> but this is off topic.
The manufacturer is determined by the “picture” (logo) next to the name.
One and the same the company sometimes changes pictures, so there are a lot of them...
Sincerely, George
TE> this is just wonderful!
TE> then let's focus on the speed given out in
TE> Gemini Commander
TE> I think if I'm not mistaken - 95 thousand!
Oh, I'm sorry! I looked later - exactly, 95 and some change.
yes, it acts as a brake!
by the way, I managed to increase the speed to 150%!!!
this was when it was 142%, but I drove back, because when reading/writing
RAM there were distortions, that is, either the attributes or the pihels themselves shifted
to the right exactly one character, well, this of course got me, and this way it was of course
faster, on even numbers about 105 thousand and on odd 115 thousand or maybe vice versa
this is all according to RamDoctor. I did this using the method described in the VMG circuit,
cut the signal going to 3 DD15s and feed it through a 240 Ohm resistor
but it didn’t help, so I shoved 5.1K Ohm in there :)
try it yourself, maybe you’ll come up with something
> TV> about 40 legs, I meant that it would be difficult to change, and I also want to
> TV> he remains alive :)))
> Is it difficult to change a “centipede”? ;)