Crysral Dream #01 31 октября 1996

Железо

RU17 - Shadow ROM for the Spectrum on K537RU17.

(C) 1996 Eugene.



         Shadow ROM K537RU17


 Before reading this article, you must read SPECTROFON N17.

 If you want to use instead 2Kb
additional memory 8k, you should instead use the K537 K537 PN10
RU17.

 RU 17 soldered (installed in socket) instead of p ^ 2 (5) so 
that:  1) 14 RU17 withdrawal coincided with a 12 p ^ 2;


    15 - "" - RU17 - "" - with 13 p ^ 2;

     3 - "" - RU17 - "" - 1 p ^ 2;

    26 - "" - RU17 - "" - with 24 p ^ 2.
 2) 1 foot to bend into the air.
 3) at 28 to submit 5 volts.
 4) by 2 foot signal address bus A13 (2
leg Z80).
 5) by 27 foot - a signal WR from Z80 (22 foot)
 6) of 23 feet RU17 cut off all communication and
connect to address bus A11 (1 foot Z80)
 7) from 26 feet RU17 cut off all communication and
connected with the inverted signal PANROM (scheme PENT 128) - 
not an inverted signal PANROM can be found at 20 RU17 foot. 
Additional inverter can be found on the floppy drive controller 
scheme (eg D84 - 13 and 12 feet). 



  This is probably vse.Esli you have
questions, call 545-707.


P.S. Import analog K537 RU17 - 6264.