Model for identification
ZXNet echo conference «hardware.zx»
Hello, Ivan
We managed to contact the person who was selling this model in our
Kurgan. According to him, this is a development from Riga. At first they purchased boards from
Riga residents, and then they began to order these boards in Yekaterinburg. In the topic "list
I couldn’t find any domestic speccy hardware from Riga models at all. The most offensive thing is
that this man said that a couple of months ago he cleaned out the warehouse and threw it away
a bunch of such boards... If you're lucky, there will be a diagram of this model.
P.S.: If any collectors are interested, I can dig up a couple more of these
copies.
Hello, Ivan
I unraveled the diagram a little. And now, attention, questions:
1. What purpose can RF2(?) have in this scheme? In parallel there is SD
place for SOS, as can be seen in the photo; There is still room for DIP28 and DIP24.
2. What needs to be supplied to the hanging inputs 4I-HE in order to use BB55?
P.S.: #FE decoding is the same curve, i.e. the keyboard is read via LP10,
decipherable from IORQ, RD and A0.
File: color.GIF http://zx.pk.ru/attachment.php?attachmentid=4344
Hello, Ivan
> 2. What needs to be supplied to the hanging inputs 4I-HE in order to use BB55?
I have no idea, but the list of ports and bits used is there -
http://sblive.narod.ru/ZX-Spectrum/Baltik/1991-05Page12.djvu
Hello, Ivan
> There is this Spectrum. Looking for a diagram. Looks like this is our local
> clone. But perhaps it has its own name. We called it
> "COLOR".
If it’s not difficult, take a photo with a higher resolution (so that the names of the microcircuits
see). It may be possible to identify (or find a similar clone). If with a photo
problems, then you can publish a list of microcircuits.
Hello Conan
By the way, I unraveled this “RF2”, it’s not RF2 at all. Something incomprehensible. On conclusions
1..8 data bus is started. Also present are A0, A1, RD, WR, power and 11
output ID7 from the circuit that I gave above. Looks like this place is just a connector
assumed. There is also a place for SNP64 and another BB55.
File: Color.rar http://zx.pk.ru/attachment.php?attachmentid=4347
Hello MegaMyth
Meg> this clone has only 32Kb of RAM...
No, rather the memory was selected with holes in the zero bank. Saved like...
Hello, Black_Cat
ru5a, b, c, d, d differ only in access time. half-leaky had index 1
or 2. for example ru5d1
Hello MegaMyth
What’s also alarming is the presence of LA2 on the board and empty seats for 40 and 28
legs Isn't this a TR-DOS controller?
Hello, Ivan
> 1. What purpose can RF2(?) have in this scheme?
In fact, this is not RF2 but VI53.
pins 1-8 - D7-D0
pins 23-19 - WR, RD, CS, A1, A0 respectively.
VI53 port addresses are 80,81,82,83.
> 2. What needs to be supplied to the hanging inputs 4I-HE in order to use BB55?
Naturally one.
I advise you to check whether the A0-A1 BB55 really goes to the A0-A1 Z80... Usually it
serve A5 A6 and attach a Kempston joystick to port A. ports accordingly
should be 1F, 3F, 5F, 7F.
And it turns out that when reading the camston joystick, the control register is read
BB55.... non-format!
Hello, Ivan
It feels like this clone only has 32Kb of RAM...
Unfortunately, I don’t have a reference book on the 565th series at hand, but as far as I can
I remember RU5D is 1/2 RU5G... but I could be wrong.
Hello MegaMyth
8 RU5D is still 48k, and, as rightly noted, it’s just access time
more. I repaired this particular copy, replaced 4 RU5 pieces - they were broken.
In the past, I collected both Leningrads on "D" and expanded them to 128k - no problems
I noticed that everything worked stably.
That there is only one is clear. I thought maybe there would be some thoughts about extras. decryption. On
BB55 comes exactly A0 and A1 from the processor. This worries me, because... at
In this connection, ID7, to put it mildly, BB55 will work crookedly. Kempston in the scheme
already exists - K580VA87 and is connected to the connector.
I have already soldered LA2 and LH1. This can be seen from the difference in the photo in the first post and
according to the latest archive. I decrypted #FE. How correct I still don’t know,
I haven’t turned it on yet :) I didn’t find the decryption scheme through various searches, I relied on
your idea of how it should be. I started A0 through an inverter, A1-A7 directly
to LA2 and output through the inverter to the native #FE decoding circuit.
I couldn’t even guess about VI53, I don’t remember ZXs with VI53 on board, maybe
that AOHs: v2_clapp; For what; she's here :v2_ohmy; It is necessary; study its principle
work - it might come in handy.
Hello, Ivan
> I couldn’t even guess about VI53, I don’t remember ZXs with VI53 on board
I'll go
Hello, Ivan
> I couldn’t even guess about VI53, I don’t remember ZXs with VI53 on
> on board, except maybe AONs Why is it here? We need to study the principle
> her work - it might come in handy.
I know at least one machine - Byte. There VI53 was used as a 3-channel
sound generator. It seems the same thing happened in Didactics.
In Pro, this m/s was used to set the clock frequency of the serial
port BB51 and converter +12->-12 for it. Channel 3 was not used
no way.
Also, in principle, this m/s can be used to measure time.