View source for Z80-SIO dual ports RS232 interface for CPC (French)

'''Philippe Lebel's Z80-SIO dual ports RS232 interface for CPC.'''

Scans of article from French magazine including description, schematic and PCB project.

== Technical ==

  FC5Ch Latch 74LS273 (IC8) for COM8116 (IC9)
          Bit7-4  Channel A RX/TX Clock
          Bit3-0  Channel B RX/TX Clock
  FC7Ch [[Z80-DART/Z80-SIO chip|Z80 SIO]] Channel A Data
  FC7Dh [[Z80-DART/Z80-SIO chip|Z80 SIO]] Channel A Control/Status
  FC7Eh [[Z80-DART/Z80-SIO chip|Z80 SIO]] Channel B Data
  FC7Fh [[Z80-DART/Z80-SIO chip|Z80 SIO]] Channel B Control/Status

For details on the Z80 SIO, see [[Z80-DART/Z80-SIO chip]]. The circuit supports both Channel A and B. However, for channel B, only RX/TX signals are implemented (though with some modification, one could add a third MAX232 for also supporting RTS/CTS and DTR/DSR).

The COM8116 chip is driven by a 4.9152 MHz crystal. Selectable clock sources are:
 0=800 Hz    4=2400 Hz    8=28800 Hz   12=76800 Hz
 1=1200 Hz   5=4800 Hz    9=32000 Hz   13=115200 Hz
 2=1760 Hz   6=9600 Hz   10=38400 Hz   14=153600 Hz
 3=2152 Hz   7=19200 Hz  11=57600 Hz   15=307200 Hz
The baudrates can be further divided by 1,16,32,64 inside of the Z80 SIO.

<gallery>
File:French DIY Dual Port RS232 schematic.jpg|Schematic
</gallery>

== Scanned Article ==

[[Media:Rs232fr.zip]] - Scanned DIY article (8 pages).

[[Category:Peripherals]]