Open main menu
Last modified on 30 September 2010, at 08:51

Schneiderware V/24 Interface

Revision as of 08:51, 30 September 2010 by Nocash (Talk | contribs) (→‎I/O Ports)

The Schneiderware V/24 Interface is a RS232 Interface, published by german magazine CPC Schneider International as part of their Schneiderware DIY series. The plain PCB, or the fully assembled board were also available via mail-order.

The ECB Bus connector of the board is intended to be plugged into the Schneiderware Basisplatine, but it could be also wired directly to the CPCs Expansion Port. The V/24 board additionally requires a Schneiderware Power Supply (or another external power supply with +12V/-12V).

  • Schneiderware #3 V/24 (RS232 Interface) (8/1986 pages 70-77, plus correction from 9/1986 page 80)

I/O Ports

Address (default) Address (alternate) Usage
F9E0h F9E2h Schneiderware V/24 8251 USART chip Data
F9E1h F9E3h Schneiderware V/24 8251 USART chip Control
F9ECh F9E8h Schneiderware V/24 8253 chip Timer 0 (TX clock)
F9EDh F9E9h Schneiderware V/24 8253 chip Timer 1 (RX clock)
F9EEh F9EAh Schneiderware V/24 8253 chip Timer 2 (unused)
F9EFh F9EBh Schneiderware V/24 8253 chip Timer Control

Caution - The clock source can be jumpered to 2MHz (default), or to 1MHz. Moreover, the handshaking signals (CTS/RTS, DTR/DSR) can be disabled via jumpers. There is no good reason for using the 1MHz setting, nor for disabling handshaking at hardware level - thse features are only "good" for provoking compatibility problems with software that expects the jumpers to be set to this or that position.

Pictures

  • V/24 Schematic

  • V/24 (component side)

  • V/24 (solder side)