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README.md
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README.md
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@ -69,14 +69,29 @@ memory.
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![Serial Console](https://github.com/sethm/symon/raw/master/screenshots/console.png)
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![Serial Console](https://github.com/sethm/symon/raw/master/screenshots/console.png)
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The main window of the simulator acts as the primary Input/Output
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The main window of the simulator acts as the primary Input/Output
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system through a virtual serial terminal. The terminal is attached to
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system through a virtual serial terminal. It also provides CPU status.
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a simulated ACIA, including a programmable baud rate generator that
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Contents of the accumulator, index registers, processor status flags,
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tries to approximate the correct "feel" of the programmed baud rate.
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disassembly of the instruction register, and stack pointer are all displayed.
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(The sample Enhanced BASIC ROM image is programmed for 9600 baud)
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It also provides CPU status. Contents of the accumulator, index
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The terminal is attached to a simulated MOS 6551 ACIA. It behaves very much
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registers, processor status flags, disassembly of the instruction
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as described in the datasheet, with some exceptions:
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register, and stack pointer are all displayed.
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- The simulated ACIA is permanently connected to the virtual terminal,
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the Data Carrier Detect and Data Set Ready status bits always indicate
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a connection is ready.
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- The parity, stop-bits and bits-per-character settings are ignored. The
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ACIA always sends and receives 8-bit characters, and parity errors
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do not occur.
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- The ACIA tries to honour the configured baud rate, but as a special case
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the default "16x External Clock" rate is interpreted to mean "as fast as
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possible" (The sample Enhanced BASIC ROM image is programmed for 9600 baud).
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- The ACIA ignores the configured state of the Data Terminal Ready pin;
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it is always ready to receive and transmit.
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For more information on the MOS 6551 ACIA and its programming model,
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see the official datasheet:
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- [MOS 6551 ACIA](http://archive.6502.org/datasheets/mos_6551_acia.pdf)
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![Font Selection](https://github.com/sethm/symon/raw/master/screenshots/font_selection.png)
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![Font Selection](https://github.com/sethm/symon/raw/master/screenshots/font_selection.png)
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