a2232
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a2232 [2019/12/09 18:54] – rewrites, added PDF schematics wiki_admin | a2232 [2021/09/05 13:34] – cleanup wiki_admin | ||
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**Commodore A2232 Serial Expansion Board** | **Commodore A2232 Serial Expansion Board** | ||
- | The A2232, launched | + | Launched |
- | + | ||
- | For more serial channels, additional A2232 boards can be plugged into the system at the same time (up to five boards giving a total of 36 serial ports). | + | |
+ | For more serial channels additional A2232 boards can be plugged into the system at the same time. Up to five boards (probably a limitation of the number of Zorro slots in any available machine at the time) giving a total of 36 serial ports are supported. | ||
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- | |||
===== Hardware ===== | ===== Hardware ===== | ||
- | The A2232 has its own MOS 65CE20 processor running at 3.58 Mhz and 16 kB of RAM (addressable by the Amiga' | + | {{https:// |
+ | |||
+ | The A2232 has its own MOS 65CE20 processor running at 3.58Mhz and has 16kB of RAM (addressable by the Amiga' | ||
There are at least two revisions of the board: | There are at least two revisions of the board: | ||
- | * Rev 4 boards | + | * Rev 4 boards: 7x MOS Technology 6551 ACIA (Asynchronous Communications Interface Adapter) chips |
- | * Rev 6 boards | + | * Rev 6 boards: 7x CSG (Commodore Semiconductor Group) 8551 ACIAs (1984 released |
Silkscreen next to the Zorro connector says BERLIN/ | Silkscreen next to the Zorro connector says BERLIN/ | ||
- | Originally the board came with user manual (missing, anyone have a scan?) and seven 80 cm long adapter cables that provided the (then) standard DB25 connections. | + | The board came with user manual (**missing, anyone have a scan?**) and seven 80 cm long adapter cables that provided the (then) standard DB25 connections. |
+ | |||
+ | ---- | ||
==== Enhancements and modifications ==== | ==== Enhancements and modifications ==== | ||
- | Up to 57600 on all ports using a custom device and hardware modification: | + | Up to 57600 on all ports using a custom device-file and hardware modification: |
Several sites also refer to mods for up to 115200 bps speeds (on all ports? Link? | Several sites also refer to mods for up to 115200 bps speeds (on all ports? Link? | ||
- | Amiga.resource.cx also has a photo of a board with a title "Rev 6 board with RTS/CTS handshake mod". Another modification is to replace the 1.84 Mhz oscillator with a 3.68 Mhz one. This doubles the baud rates but the software won't know about this so the user must keep this in mind when using the board. | + | Amiga.resource.cx also has a photo of a board with a title [[http:// |
- | ==== Schematics ==== | + | Another modification is to replace the 1.84Mhz oscillator with a 3.68Mhz one. This doubles the baud rates but the software won't know about this so the user must keep this in mind when using the board. |
- | {{https:// | + | |
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- | |||
==== Serial port pinouts and cables ==== | ==== Serial port pinouts and cables ==== | ||
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The connector nearest to the Zorro connector of the board (leftmost) is the first serial port. | The connector nearest to the Zorro connector of the board (leftmost) is the first serial port. | ||
- | The board uses seven mini 8-pin DIN connectors (similar to the S-Video or PS/2, but more pins) to fit all the connectors to the end plate of a single expansion board. | + | The board uses seven mini 8-pin DIN connectors (similar to the serial ports in Apple Macintosh computers) to fit all the connectors to the end plate of a single expansion board. |
{{ : | {{ : | ||
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</ | </ | ||
- | //Editors notes: I had lot of problems finding a working pinout of the mini din connector. Commodore' | + | // Thanks to mackbw |
- | // | + | |
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- | |||
===== Using the serial ports ===== | ===== Using the serial ports ===== | ||
- | ==== Workbench | + | ==== Amix ==== |
+ | In Amiga UNIX the first port of the A2232 is available at **/ | ||
+ | |||
+ | Probably the main selling point of the A2232 was the ability to connect several serial terminals to an AMIX machine running as a server. | ||
+ | |||
+ | Use the pmadm command to start a login shell at any of the serial ports: | ||
+ | < | ||
+ | This enables a shell in the first port at the default speed of 9600 bps (the defaults are defined as the ' | ||
+ | |||
+ | A real vintage dumb terminal (or a device like PockeTerm from Briel Computers (sadly no longer available)) or a modern PC with a serial port and a terminal emulator can be connected to the port and used to log into the machine. | ||
+ | |||
+ | ==== Workbench ==== | ||
- | In Workbench the ports can be accessed using the serial.device driver (ver 33.11 from 1990 and newer, install disk available at Amiga.resource.cx) with the following unit numbers: | + | In Workbench the ports can be accessed using the serial.device driver (ver 33.11 from 1990 and newer, install disk available at [[http:// |
<table label> | <table label> | ||
- | < | + | < |
- | |Unit 0|default | + | |Unit 0|default | |
|Unit 1|Amiga' | |Unit 1|Amiga' | ||
|Unit 2|A2232' | |Unit 2|A2232' | ||
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</ | </ | ||
- | If several A2232 boards are installed, the second board' | + | Unit 0, the default setting can be set in Workbench' |
- | + | ||
- | ==== Amix ==== | + | |
- | + | ||
- | In Amiga UNIX, the first port of the A2232 is known as **/ | + | |
- | + | ||
- | Probably the main selling point of the A2232 was the ability to connect several | + | |
- | A real vintage dumb terminal | + | If several A2232 boards are installed |
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a2232.txt · Last modified: 2021/09/19 18:00 by 127.0.0.1