Adventurer #02 16 марта 1996

Железо

Up Work - Up Work for "PENTAGON 128": correcting spontaneous obrabatyvaniya some keys, updating Sinclair-joystick.

     And now, your attention will provide information for fans 
to climb on to their computer with a soldering iron. 


    (C) Gribanov DG (Sometimes-GDGSOFT)



         Revised "PENTAGON 128"



      Attention users PENTAGON'a
suggests two improvements greatly
improving the work of this computer:


              CHANGES N 1



     When connected to l and m and a y r s,
performed on thin film technology
because of the high resistivity is much greater than the 
resistance short circuit, which takes place at the keyboard, 
performed on metal contacts or reed, sometimes occurs 
spontaneous firing of some keys, which leads to unpredictable

consequences. For example, playing in 48 IRON
on the keyboard for some combinations
keystrokes you can easily get out of
games (work Q-QUIT) at the most inopportune moment.

      Obmateriv all existents: sitting, standing and any 
others, spitting on his only favorite computer, does not

forgetting and then scrub it from the spit, you
Again, start 48 favorite Iron.
This continues for as long as you do not
explode with anger and start
destroy your computer. In particular -
keyboard.

      To avoid such troubles, rather somewhere to find a pair
Chipset 555LI1 or 155LI1.

     The essence of the revision is to address filtering 
signals A8-A15, coming to the diodes keyboard signal A0 to 
diagram below: 


A8 ... A15 'to the cathode of the diode

                  appropriate

      A0 A8 A15 category ...



      A8 ... A15 signals can be removed from
buffer chip 555AP5 (DD70)
pin. 18,16,14,12,9,7,5,3 respectively.
The cathodes of diodes VD4-VD11 need vypayat
of the board. All connections are made by wires, PTFE is 
better. Chip 555LI1 conveniently located on the neighboring

chetyrnadtsativyvodnyh chips.



              CHANGES N 2



     Designed for owners of the computer you want to play some 
games together or even three. 

     This revision concerns SINCLAIR
Joystick, ie Joystick SINCLAIR 1 and
SINCLAIR 2.

     Those who have this revision is done, no more problems in 
the interdependence of joysticks from each other, as well as 
interdependence of the joystick and keyboard. 

     The essence of the revision: to solder a diode in series 
in a circuit, going from the nest connector. Revised scheme 
attached. 



               M E L E G O



      (C) Khripkov Yuri (Left Handed)



         # FD-etyam dedicate!


      Port # FD on the (ATM) TURBO 2 +



     In TURBO 2 + port configuration
SPECTRUM 128 switches, if a bit A9
address bus is in unity and with
using the command OUT (# FD), A for
Switching memory pages, this bit
does not open, ie is zero,
that can not do what they do
on the laptop PENTAGON 128. The essence of this
refinement is to ignore this bit for decoding the port.
As it happens, you can sort by
scheme. Simply cut off the A9 from the first

Output D17 and apply a logical unit
the first step D17 is impossible, since violated decoding ports 
AY 8912 (8910), as well as port and DAC TLRD (telephone

line).

     And now I want to introduce another
development for the Spectrum - stereo 8-and
bit DAC, connected to the music coprocessor. The scheme itself
simple and should not cause difficulties.
Although if someone something will not
clear in this or previous scheme, then
contact, and detailed descriptions of the schemes
will be published in next issue
magazine.

     It is worth mentioning how to operate this device. 
Musically, the AY 8910 (40-legged body), there two ports 
operating on input and output, to which should be connected 
this very damn. These ports can be programmed to input

or output through the sixth and seventh bits of R7
music processor. Zeros in these bits indicate that the ports 
are programmed normalized to reading the information, and 
yedinichku that the ports can output information. Here's the 
state of the output data what we need. Hence, in R7 captures 255

(# FF), and by R14 and R15 control the left
and right channel DACs. Reproducing digitization through this 
device, the sound quality is higher than if produce output the 
music through a music processor, as implemented in DIGITAL 
STUDIO, INSTUMENT'e and SAMPLER'e. 

P.S. At the moment, a program that supports this device (enable 
write music under the device) does not exist.

So, go for it, programmer!


   On this for now. We are waiting for new messages!
For as the saying goes, "one head - well, as N - N times better!


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