home *** CD-ROM | disk | FTP | other *** search
- Hc11 - Amiga Communication.
-
- $VER: Hc11-Amiga_Communication 1.0 (5-Jul-93)
-
- View this file with a PC style font. See file "BasicA1.Sch" for more
- info.
-
- This little circuit will be needed to convert the Amiga RS232 voltage
- levels to TTL levels used by the Hc11.
-
- Gnd +5vdc
- ³ ÚÄÄÄÂÄÂÄÄÄ¿ ³
- ³ÚC1+´C2+ÀÄÙC1+Ã+C1¿³
- ÃÅÄÄÄ´Gnd VccÃÄÄÄÅ´
- ³ÀÄÄÄ´C2- C1-ÃÄÄÄÙ³
- ÀÄ+C1´Vss VddÃ+C1ÄÙ
- AmyTxDÄÄ´ ÃÄÄÄo(1)
- AmyRxDÄÄ´ ÃÄ¿ oÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄHc11RxD(Port D bit 0)
- ÚÄ´ Ã ÀÄo(2)ÄÄÄÄÄÄÄÄÄÄÄÄÄHc11TxD(Port D bit 1)
- ³ ´ ÃÄ¿
- ÃÄ´ Ã ³
- ³ ´ ÃÄ´
- ³ ÀÄÄIC-01ÄÄÙ ³
- ³ ³
- ÀÄÄÄÄÄÂÄÄÄÄÄÄÄÁÄGnd
- ³
- AmyGndÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄHc11Gnd
-
- Description
- -----------
- Gnd Ground
- C1 Electrolytic capacitor 10uF
- IC-01 Mc145407P
- ooo SPDT-switch
-
- You will also need a DB25 female connector to connent this to
- your Amiga.
-
- Amiga Serial Connector
-
- Pin Function
- ------------------
- 2 TxD
- 3 RxD
- 7 Ground
- Connect pins 5,6,8 and 20 to each other.
-
-
- Set the switch in position 1 for downloading, and in position 2
- for running the program. In the final product connect PD0 and
- PD1 together. That will make the program run every time you
- power up the Hc11.
-
- Also remeber to connect Ground from the Amiga, this circuit and
- the Hc11 to each other.
-
- If you want to see if something is happening with the Hc11 when
- downloading programs to it you can connect a logic probe or similar
- (High impedance LED driver (Transistor)) to the TxD and/or RxD lines.
- But remember to do that on the Hc11 side, NOT the Amiga side since
- the Amiga uses RS232 (-12vdc to +12vcd) levels and that could
- probably damage your probe or at least show fauly readings.
-
- Be careful not to damage your Amiga.
-