The third and fourth parts are primarily for the use of the systems programmer and
should generally not be utilized by applications programmers.
Systems software normally is conFigured to handle the setting of particular signals, no
matter how the physical connections may change. In other words, if you have a version of
the system software that matches the revision level of the machine (normally a true
condition), when you ask that a particular bit be set, you don't care which port that bit is
connected to. Thus, applications programmers should rely on system documentation
rather than going directly to the ports.
NOTE
In a multitasking operating system, many different tasks may be competing for the use of
the system resources. Applications programmers should follow the established rules for
resource access in order to assure compatibility of their software with the system.
************** PART 1 - OUTSIDE WORLD CONNECTORS ********************
This is a list of the connections to the outside world on the Amiga.
RS232 and MIDI Port
-------------------
A500/ CBM
PIN RS232 A1000 A2000 PCs HAYES DESCRIPTION
--------------------------------------------------------------
1 GND GND GND GND GND FRAME GROUND
2 TXD TXD TXD TXD TXD TRANSMIT DATA
3 RXD RXD RXD RXD RXD RECEIVE DATA
4 RTS RTS RTS RTS Ñ REQUEST TO SEND
5 CTS CTS CTS CTS CTS CLEAR TO SEND
6 DSR DSR DSR DSR DSR DATA SET READY
7 GND GND GND GND GND SYSTEM GROUND
8 CD CD CD DCD DCD CARRIER DETECT
9 - - +12v +12v - +12 VOLT POWER
10 - - -12v -12v - -12 VOLT POWER
11 - - AUDO - - AUDIO OUTPUT
12 S.SD - - - SI SPEED INDICATE
13 S.CTS - - - -
14 S.TXD -5Vdc - - - -5 VOLT POWER
15 TXC AUDO - - - AUDIO OUT OF AMIGA
16 S.RXD AUDI - - - AUDIO IN TO AMIGA
17 RXC EB - - - BUFFERED PORT CLOCK 716kHz
18 - INT2* AUDI - - INTERRUPT LINE TO AMIGA
19 S.RTS - - - -
20 DTR DTR DTR DTR DTR DATA TERMINAL READY
21 SQD +5 - - - + 5 VOLT POWER
22 RI - RI RI RI RING INDICATOR
23 SS +12Vdc - - - +12 VOLT POWER
24 TXC1 C2* - - - 3.58 MHZ CLOCK
25 - RESB* - - - BUFFERED SYSTEM RESET
- 296 Appendix E -
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