Dni-Pro #01 18 ноября 2000

Железо

Iron - Wiring diagram domestic Hayes modem to the ZX Spectrum.

           WIRING

       INTERNAL MODEM HAYES

      (Reproduced with modifications)


                           (C) G. Shepelev


   For the lazy propose a scheme
connect the internal modem from hayes
iBM. Why lazy? To purchase or
create another brand of modem robust design should be
strain, which will agree, not everyone
pret, so you should not run around in search of
miracle, but rather to gain some gorepisishnika and buy 
(dismantled at work, after removing the accession number:)) a 
standard modem and debugged stick according to the scheme to 
its Spectrum. Terminalki already have for such gadgets, and the 
network is better to run with hayes'nym iron.




     The PCB address bus with the A0-A15.


   In the original scheme, instead of the signal A6
fed A1 and instead _OIRQ_ - _IORQ_, and
decoding modem at the address: # 38FD-# 3FFD, which led to the 
blocking pamati more than 48 kilobytes. 

   In this scheme, decryption modem is implemented at the 
following addresses # 38BF-# 3FBF. 

   Many modems sufficient supply 5V,
but some may require voltage other denominations:


                - 5V - B5

                -12V - B7

                + 5V - B3, B29

                +12 V - B9


   And find out which ones are needed, you can determine by 
looking at the modem connector. 


                                 GAME BOY