redistribution
The original EhBASIC website is unavailable at this time. This repository restores the availability of the original EhBASIC source and documentation.
This commit is contained in:
Klaus2m5
commit
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# Auto detect text files and perform LF normalization
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* text=auto
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# Custom for Visual Studio
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*.cs diff=csharp
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*.sln merge=union
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*.csproj merge=union
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*.vbproj merge=union
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*.fsproj merge=union
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*.dbproj merge=union
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# Standard to msysgit
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*.doc diff=astextplain
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*.DOC diff=astextplain
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*.docx diff=astextplain
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*.DOCX diff=astextplain
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*.dot diff=astextplain
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*.DOT diff=astextplain
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*.pdf diff=astextplain
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*.PDF diff=astextplain
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*.rtf diff=astextplain
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*.RTF diff=astextplain
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#################
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## Eclipse
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#################
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*.pydevproject
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.project
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.metadata
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bin/
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tmp/
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*.tmp
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*.bak
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*.swp
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*~.nib
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local.properties
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.classpath
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.settings/
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.loadpath
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# External tool builders
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.externalToolBuilders/
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# Locally stored "Eclipse launch configurations"
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*.launch
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# CDT-specific
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.cproject
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# PDT-specific
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.buildpath
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#################
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## Visual Studio
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#################
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## Ignore Visual Studio temporary files, build results, and
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## files generated by popular Visual Studio add-ons.
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# User-specific files
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*.suo
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*.user
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*.sln.docstates
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# Build results
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[Dd]ebug/
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[Rr]elease/
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x64/
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build/
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[Bb]in/
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[Oo]bj/
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# MSTest test Results
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[Tt]est[Rr]esult*/
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[Bb]uild[Ll]og.*
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*_i.c
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*_p.c
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*.ilk
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*.meta
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*.obj
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*.pch
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*.pdb
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*.pgc
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*.pgd
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*.rsp
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*.sbr
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*.tlb
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*.tli
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*.tlh
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*.tmp
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*.tmp_proj
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*.log
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*.vspscc
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*.vssscc
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.builds
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*.pidb
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*.log
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*.scc
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# Visual C++ cache files
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ipch/
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*.aps
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*.ncb
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*.opensdf
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*.sdf
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*.cachefile
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# Visual Studio profiler
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*.psess
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*.vsp
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*.vspx
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# Guidance Automation Toolkit
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*.gpState
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# ReSharper is a .NET coding add-in
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_ReSharper*/
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*.[Rr]e[Ss]harper
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# TeamCity is a build add-in
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_TeamCity*
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# DotCover is a Code Coverage Tool
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*.dotCover
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# NCrunch
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*.ncrunch*
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.*crunch*.local.xml
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# Installshield output folder
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[Ee]xpress/
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# DocProject is a documentation generator add-in
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DocProject/buildhelp/
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DocProject/Help/*.HxT
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DocProject/Help/*.HxC
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DocProject/Help/*.hhc
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DocProject/Help/*.hhk
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DocProject/Help/*.hhp
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DocProject/Help/Html2
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DocProject/Help/html
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# Click-Once directory
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publish/
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# Publish Web Output
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*.Publish.xml
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*.pubxml
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# NuGet Packages Directory
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## TODO: If you have NuGet Package Restore enabled, uncomment the next line
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#packages/
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# Windows Azure Build Output
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csx
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*.build.csdef
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# Windows Store app package directory
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AppPackages/
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# Others
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sql/
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*.Cache
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ClientBin/
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[Ss]tyle[Cc]op.*
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~$*
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*~
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*.dbmdl
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*.[Pp]ublish.xml
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*.pfx
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*.publishsettings
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# RIA/Silverlight projects
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Generated_Code/
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# Backup & report files from converting an old project file to a newer
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# Visual Studio version. Backup files are not needed, because we have git ;-)
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_UpgradeReport_Files/
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Backup*/
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UpgradeLog*.XML
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UpgradeLog*.htm
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# SQL Server files
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App_Data/*.mdf
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App_Data/*.ldf
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#############
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## Windows detritus
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#############
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# Windows image file caches
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Thumbs.db
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ehthumbs.db
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# Folder config file
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Desktop.ini
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# Recycle Bin used on file shares
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$RECYCLE.BIN/
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# Mac crap
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.DS_Store
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#############
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## Python
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#############
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*.py[co]
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# Packages
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*.egg
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*.egg-info
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dist/
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build/
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eggs/
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parts/
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var/
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sdist/
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develop-eggs/
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.installed.cfg
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# Installer logs
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pip-log.txt
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# Unit test / coverage reports
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.coverage
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.tox
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#Translations
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*.mo
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#Mr Developer
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.mr.developer.cfg
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Binary file not shown.
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@ -0,0 +1,134 @@
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; minimal monitor for EhBASIC and 6502 simulator V1.05
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; To run EhBASIC on the simulator load and assemble [F7] this file, start the simulator
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; running [F6] then start the code with the RESET [CTRL][SHIFT]R. Just selecting RUN
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; will do nothing, you'll still have to do a reset to run the code.
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.include "basic.asm"
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; put the IRQ and MNI code in RAM so that it can be changed
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IRQ_vec = VEC_SV+2 ; IRQ code vector
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NMI_vec = IRQ_vec+$0A ; NMI code vector
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; setup for the 6502 simulator environment
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IO_AREA = $F000 ; set I/O area for this monitor
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ACIAsimwr = IO_AREA+$01 ; simulated ACIA write port
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ACIAsimrd = IO_AREA+$04 ; simulated ACIA read port
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; now the code. all this does is set up the vectors and interrupt code
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; and wait for the user to select [C]old or [W]arm start. nothing else
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; fits in less than 128 bytes
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*= $FF80 ; pretend this is in a 1/8K ROM
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; reset vector points here
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RES_vec
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CLD ; clear decimal mode
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LDX #$FF ; empty stack
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TXS ; set the stack
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; set up vectors and interrupt code, copy them to page 2
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LDY #END_CODE-LAB_vec ; set index/count
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LAB_stlp
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LDA LAB_vec-1,Y ; get byte from interrupt code
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STA VEC_IN-1,Y ; save to RAM
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DEY ; decrement index/count
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BNE LAB_stlp ; loop if more to do
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; now do the signon message, Y = $00 here
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LAB_signon
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LDA LAB_mess,Y ; get byte from sign on message
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BEQ LAB_nokey ; exit loop if done
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JSR V_OUTP ; output character
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INY ; increment index
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BNE LAB_signon ; loop, branch always
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LAB_nokey
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JSR V_INPT ; call scan input device
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BCC LAB_nokey ; loop if no key
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AND #$DF ; mask xx0x xxxx, ensure upper case
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CMP #'W' ; compare with [W]arm start
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BEQ LAB_dowarm ; branch if [W]arm start
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CMP #'C' ; compare with [C]old start
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BNE RES_vec ; loop if not [C]old start
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JMP LAB_COLD ; do EhBASIC cold start
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LAB_dowarm
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JMP LAB_WARM ; do EhBASIC warm start
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; byte out to simulated ACIA
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ACIAout
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STA ACIAsimwr ; save byte to simulated ACIA
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RTS
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; byte in from simulated ACIA
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ACIAin
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LDA ACIAsimrd ; get byte from simulated ACIA
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BEQ LAB_nobyw ; branch if no byte waiting
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SEC ; flag byte received
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RTS
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LAB_nobyw
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CLC ; flag no byte received
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no_load ; empty load vector for EhBASIC
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no_save ; empty save vector for EhBASIC
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RTS
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; vector tables
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LAB_vec
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.word ACIAin ; byte in from simulated ACIA
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.word ACIAout ; byte out to simulated ACIA
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.word no_load ; null load vector for EhBASIC
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.word no_save ; null save vector for EhBASIC
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; EhBASIC IRQ support
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IRQ_CODE
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PHA ; save A
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LDA IrqBase ; get the IRQ flag byte
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LSR ; shift the set b7 to b6, and on down ...
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ORA IrqBase ; OR the original back in
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STA IrqBase ; save the new IRQ flag byte
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PLA ; restore A
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RTI
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; EhBASIC NMI support
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NMI_CODE
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PHA ; save A
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LDA NmiBase ; get the NMI flag byte
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LSR ; shift the set b7 to b6, and on down ...
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ORA NmiBase ; OR the original back in
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STA NmiBase ; save the new NMI flag byte
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PLA ; restore A
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RTI
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END_CODE
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LAB_mess
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.byte $0D,$0A,"6502 EhBASIC [C]old/[W]arm ?",$00
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; sign on string
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; system vectors
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*= $FFFA
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.word NMI_vec ; NMI vector
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.word RES_vec ; RESET vector
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.word IRQ_vec ; IRQ vector
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@ -0,0 +1,15 @@
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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 Lee Davison at leeedavison@googlemail.com
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for conditions.
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