Deja Vu #07 31 декабря 1997

Железо

drop of solder - Reserves ZX-Spectrum.

AY-Track: DONT KNOW HOW TO CALL IT!!!!
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(C) Andrey Ovsyannikov
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           Reserves ZX-SPECTRUM

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   Leave these things made me another
brilliant idea. Analyzing the journal
"ELEMENT 1" from ENERGY 9 (very good
magazine), I thought about one thing: KEMPSTONklaviature (how 
far were the thoughts of a mouse driver that I have drowned). 
The thought was this: to hang the function keys along the 
digital to the same addresses, but outputs to start on port 31.


   This device does not interfere with the main
keyboard, and its use entirely
depends on your software.

   Another idea is to
SPECCY to hang as much as 16-32 bit bus.

   Through my hands passed a lot of schemes, but
all had one thing: the outputs of memory 128-x cars converged 
pumped to the data bus buffer. 

   And if you break the output lines of RAM soldered to the 
existing buffer is the same, but only its inputs connected to 
outputs of the 2 nd line, and outputs to file for the data bus.


   - And what?

   - Yes, that now with devices that do not
associated with the data bus, both lines can operate 
simultaneously, leaving processor of the same 8-bit memory.


   It should include work ULA
as with the simultaneous issuance of two (or three or four) 
bytes for example, for display or sound card, and a singlet. 


           The theory here is that:


   CAS signals are in two cases - when
Treatment of the processor (on MREQ) and the ULA
(Always regular).

   When applied simultaneously CAS'ov from ULA
for both line mode can be implemented
its color at each pixel, or a standard screen and the sound 
card. With a split - 512x192 or see above, but after "or". And 
finally, you can only submit a CAS. What will be - to think out 
for yourself. 

P.S. And, you can hang on to the display multiplexer address 
register and then you can will print the screen is not only # 
4000 (# C000), but with a random address modulo 31.




   And here is the recipe for "intelligent" sound
map:

   Take the "Leningrad" and podtseplyaem thereto
DACs (you can hang the new ports, but you can instead display), 
change the ROM, INT, we start NMI. For communication with the 
main components use existing ports. 

P.S. This opus is not worth considering
as an advertisement of the next H.M. (R.ules' Nogo)
freaks. This device is not ready and it is unlikely
will be ready sometime in the form in which
he described. I wish that this matter is much more interested 
in strong circuitry, rather than your humble servant.


   In turn, I will be glad of any information on this subject, 
which it considers necessary publish the magazine "DEJA VU".




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