DMA SC

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■ Forwarded by Pawel Kislyak (2:454/11.25)
■ Area : NETMAIL (NETMAIL)
■ From : Pawel Kislyak, 2:454/11.25 (Sun Jun 04 2000 16:29)
■ To : Roman Chupak
■ Subj : DMA SC
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Hello Roman.

I received a letter from Dima, this is what he asked me to tell you:

1. About the scheme. The scheme that I sent to Pavel is quite workable,
both we and the guys in Severodonetsk assembled using it.
2. Nutrition. The voltage drop on the DMA Ultrasoun Card when the computer is running should be at least 2%, i.e. The voltage should be
at least 4.8 - 4.9 V. It is best to “stick” the power connector
directly to the card itself.
3. It is advisable to install blocking
power containers on some m/s.
4. To eliminate such a phenomenon as the loss of samples during
playback, it is necessary to install a blocking resistor
between Reset and ground with a nominal value of 1 kOhm on the TM9 in the corresponding
channels (in which samples disappear). And I also asked Alexey about
the USC DMA circuit, where DD20 is LA2, to which he replied -
“Everything works there, in principle, only from time to time, instead of vector #FF
, vector #7F jumps in. In the last circuit, this glitch is fixed.”

Pawel

Bye!
Pawel_...@mail.ru [ZX] [Real Software]