ACNews #06 01 ноября 2001

Софт

Scoop - Controller IBM-compatible keyboard and mouse for all ZX Spectrum computer (How to work and connection). How to write your own driver for the ZX-Word

/------------------------ SENSATION! --------------------------/


   1. Oleg Gaydarzhi g.Bolohovo of the Tula region. sent an 
interesting document entitled "Controller IBM-compatible 
keyboard and mouse for all ZX Spectrum kompyutera.Instruktsiya 
to work and connection. V 2.1. Company Scorpion 'DK (St. 
Petersburg - 1995, 96). "To quote a passage devoted to the 
Kempston Mouse: 

   4. Working with the mouse.
When you use the mouse in your own programs, consider the 
following: When you move the mouse MOUSE in the output ports of 
origin are summarized received the increment in the light of 
signs (up and right - positive, down and left - negative). In 
this case, port # FBDF contains the coordinates of X, and the 
port # FFDF - Y. In the port # FADF at the released the left 
button D0 = 1, when pressed - D0 = 0, for the right button is 
used similarly D1 ". 

   Hence, the controller skorpionovskom SAME layout
The mouse button that is on most of the pentagon!

   Well, zhelezyachniki? (TS - ay!;)) Take the soldering iron 
and place a correct layout! :)))



   2. Sergei Ignatov sent an excerpt from the documentation for 
ZX-Word. Read! I figeyu% -)



     "How to write your own driver.

     If your printer's wiring diagram is different from the 
above, in order to avoid alterations in the computer, you must 
create your driver. This is a small program in machine code, 
located at the address # 5B01 (! - DB) and having a length of 
not more than 255 bytes. (This is the unused area of ​​the 
buffer ZX-printer). In the beginning program, place an entry 
point for which the editor will contact the driver: 

     # 5B01 - initialization of the port; (! - DB)

     # 5B03 - transfer a byte from register A to the printer 
port; 

     Initialization procedure must configure the programmable
Port (if any), check the readiness of the printer and
the need to issue to the printer escape sequence.
This procedure does not return anything.

     The procedure for the transfer of bytes to the printer 
must wait for its availability and transmit bytes to the 
printer port with gating. The procedure should be interrupted 
by pressing the BREAK or when errors. If the bytes for any 
reason is not passed to the printer port, the procedure returns 
a pointer to "C" setting. 

     Both procedures may modify any registers protsessora.V 
case of successful completion of the second procedure flag "C" 
must be reset. The procedure for the transfer of bytes to the 
printer caused by Illicit interrupts. (! - D.B.)



     When writing a driver is not allowed:
1.Vozmozhnost hopeless loop;
2.Vozmozhnost out in BASIC (the RST # 08, or through the bottom 
of the stack); 3.Izmenenie interrupt type;

4.Razreshenie interruption during data transfer via
5.Obraschenie to DOS;
6.Perenaznachenie canals and streams, as well as their opening 
or closing; 7.Programmnye interrupts (RST # NN);

8.Modifikatsiya stack pointer register, or a pair of IR;
9.Narushenie stack;
10.Modifikatsiya memory outside the buffer ZX-printer. (However,

   If needed, use the lower 2 / 3 of the screen area. This,

   Of course, unaesthetic, but painless).


   Well, and what do I do now? ;]