I ask for help with the ZX-BUS expander circuit
ZXNet echo conference «hardware.zx»
Hello, All
I decided to assemble a ZX-BUS bus expander circuit published in Spectrum Expert
2 (http://trd.speccy.cz/press/sp_exper/SP_EXP2.ZIP section Hardware). So that without
be careful and carefully cut a few pieces of iron to your scorpion.
I ran around all the shops and markets in the city, damn it, I can’t find 1533KP15 or an equivalent.
I’ve already spent two or three months on this crap, I’m tired of it.
In this regard, I ask you, iron masters. Please tell me if it is possible in
this scheme, in my case, refuse to use KP15 (it’s better to use them altogether
throw out the schematics nafik)? And is it possible to do without LE1 (I have them, but if
You can do without them, then why not :)). Those. so that from the microcircuits you need
only 1533AP6, which, fortunately, I have.
And here is the ZX-BUS circuit itself from X-Trade;
Picture:; http://i19.photobucket.com/albums/b175/muchast/ZX-BUS.png
Hello, Black_Cat
Bla> Import 74xx251. Can be changed without any modifications to KP7 (74xx151). LE1
Bla> can be replaced with a set of 3 resistors and 4 diodes, but this is not
Bla> good :smile; .;
Thank you very much! And why didn’t I think to ask before... ;) I’ll lose KP7
search.
Hello, Evgeny Muchkin
Evg> 1533KP15
Import 74xx251. Can be changed without any modifications to KP7 (74xx151). LE1 is possible
replace it with a set of 3 resistors and 4 diodes, but this is not good :smile; .;
Hello, ewgeny7
ewg> KP15 in St. Petersburg are sold at Mikronik for three rubles. Recently myself
ewg> bought there.
ewg> Download price from www.micronika.ru
Yes, I’m this chick there (that cute chick, it’s even strange; and what is she doing there?
among these microcircuits :)) the saleswoman is already sick of this KP15. Came 5 times
I asked, there is no grit.
And now, apparently, the delivery has taken place. But anyway, I’ll try to drop by today
Megaelectronics (www.megachip.ru), they also seem to have 74HC151
(I prefer imported ones whenever possible).
Thanks for your feedback!
Hello, Black_Cat
I'll try to find KP7 first, if that doesn't work, then I'll probably have to
talk about replacing them with something. But something tells me that KP7 is me
I can find it without any problems...
Hello, Evgeny Muchkin
Evg> Yes, I’m this girl there
Are you talking about this sleepy blond roach :)
I haven't seen such a brake for a long time!
She always has nothing. Maybe he doesn’t know how to use his own computer?
Hello, Evgeny Muchkin
Evg> I ran around all the shops and markets in the city, damn it, I can’t find 1533KP15 or
Evg> analog
KP15 in St. Petersburg are sold at Mikronik for three rubles. I recently bought it there myself.
Download price from www.micronika.ru
Hello, Evgeny Muchkin
2 gearbox housings can be replaced with N AP housings + N additional housings. logic, but this
perversion :smile; .; List what is available and from this you can already parse
design. Can be replaced at a minimum with 2 KP2 (74xx153) housings or
KP12 (74хх253) plus LH1 (74хх04). Better than KP12, because in this case it is possible
get rid of LE1 as well and the number of buildings will be the same.
Hello, Evgeny Muchkin
According to the price list in chip-dip for Vosstaniya (tel. 719-6146) there is 74HC151 - 12p.
Hello, ewgeny7
No, not about the blonde one. And about the one whose nails are long and covered in pebbles :)
Hello, Evgeny Muchkin
of: The discussion smoothly moves into the section on sex techniques ;)
Hello, Evgeny Muchkin
Evg> (such a cute girl, it’s even strange; and what is she doing there among
Evg> of these microcircuits) the saleswoman is already sick of this KP15.
This girl is cool, she found me almost all the green scorpion, and her neighbor
- lazy. didn’t want to search, the register on the keyboard tells me
switch
Hello, Black_Cat
With your permission, the topic has been "edited". Reasoning about girls is better
look in flame :)