86 lines
3.0 KiB
Plaintext
86 lines
3.0 KiB
Plaintext
This directoy contains a very slightly modified version of EhBASIC 2.22
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to support the Symon simulator.
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Usage
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-----
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The pre-assemled ROM image 'ehbasic.rom' in the "samples" directory is all you
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need unless you want to rebuild this source code.
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Just copy the image 'ehbasic.rom' to the directory where you run Symon, and
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rename the file to 'rom.bin'. It will be loaded at memory location $D000 when
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the simulator starts up. Click "Run" and you'll be presented with BASIC.
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At the first prompt, type 'C' for a Cold Start
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When prompted for free memory, type: $C000
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Note that EhBASIC only accepts upper case input, so you'll need to use caps
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lock (the cruise control for cool) to really make the most of it.
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Building
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--------
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To build it, you'll need the CC65 tool chain from http://www.cc65.org/
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and a suitable version of 'make'. Just typing:
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% make
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in this directory should re-build everything. You'll get a listing,
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some object files, and the ROM image itself.
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Changes from the EhBASIC 2.22
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-----------------------------
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- Minor syntax changes to allow assembly with the cc65 tool chain.
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- Memory map modified for Symon.
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- At reset, configure the 6551 ACIA for 8-N-1, 2400 baud.
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- Monitor routines 'ACIAin' and 'ACIAout' modified for the 6551 ACIA.
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Specifically, reading and writing will check the 6551 status register for
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the status of rx and tx registers before receive or transmit.
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EhBASIC is copyright Lee Davison <leeedavison@googlemail.com>
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My changes are so slight that I hesitate to even say this, but for "CYA"
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reasons:
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Changes are copyright Seth Morabito <web@loomcom.com> and are distributed under
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the same license as EhBASIC. I claim no commercial interest whatsoever. Any
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commercial use must be negotiated directly with Lee Davison.
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Original EhBASIC 2.22 README
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----------------------------
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Enhanced BASIC is a BASIC interpreter for the 6502 family microprocessors. It
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is constructed to be quick and powerful and easily ported between 6502 systems.
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It requires few resources to run and includes instructions to facilitate easy
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low level handling of hardware devices. It also retains most of the powerful
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high level instructions from similar BASICs.
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EhBASIC is free but not copyright free. For non commercial use there is only one
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restriction, any derivative work should include, in any binary image distributed,
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the string "Derived from EhBASIC" and in any distribution that includes human
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readable files a file that includes the above string in a human readable form
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e.g. not as a comment in an HTML file.
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For commercial use please contact me, Lee Davison, at leeedavison@googlemail.com
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for conditions.
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For more information on EhBASIC, other versions of EhBASIC and other projects
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please visit my site at ..
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http://mycorner.no-ip.org/index.html
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P.S. c't magazin, henceforth refered to as "those thieving german bastards", are
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prohibited from using this or any version of EhBASIC for any of their projects
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or products. The excuse "we don't charge people for it" doesn't wash, it adds
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value to your product so you owe me.
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