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<h1>Multicomp Z80 with b/w Graphics</h1>
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<img src="https://retrobrewcomputers.org/lib/exe/fetch.php?w=320&h=240&tok=c48b42&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fmuellerk%2Fmymulticompz80-system.jpg" class="media" title="www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_muellerk_mymulticompz80-system.jpg" alt="www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_muellerk_mymulticompz80-system.jpg" width="320" height="240" />
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<h2>Introduction</h2>
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The graphics expansion consists of two parts, the modified multicomp-z80 VHDL-code and an RSX-package, that holds the needed software to handle the graphic output (dots, lines etc., bitmaps and text). Incl. are also several demo programs which I used to create the shown screenshots.
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<p>
Some general parameters:
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<ul>
<li class="level1"> ASCII-Display is 80×30 (Col. * Row)</li>
<li class="level1"> Graphic-Display is 640x240px Black & White, no Attribute-RAM</li>
<li class="level1"> Fully programmable Font-ROM</li>
<li class="level1"> ASCII-Cursor ON/OFF via Port access</li>
<li class="level1"> RSX-Module (as binary) with basic functions for text, line graphics, bitmaps (only b/w bitmaps, size up to screen size) and Font-ROM access</li>
<li class="level1"> Files with C-functions to communicate with the RSX and handle the graphics in user programs.</li>
<li class="level1"> Several ready to run binaries (5 demos) and beside that some com's for graphic-screen clearing, graphic-screen ON/OFF and font-exchange (!)</li>
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<h2>Build Information</h2>
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Of course, a Multicomp Cyclone-IVb as mentioned above, a programmer for the FPGA-chip, the ready-to-use ALTERA-Quartus2 V13.0.1 software for programming <img src="https://retrobrewcomputers.org/lib/images/smileys/icon_lol.gif" class="icon" alt="LOL" /> All c-/asm-source and binary files are included. For assembling/recompiling you need the M80 Assembler and the MESCC C-Compiler system from Github. Instructions how to do both steps is described in 'xgraph.txt' included in the 'Multcomp-Z80_xgraph-*.tar.gz' package. I haven't checked whether the HiTech C-Compiler can do the job too.
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<h2>Builder's Notes/Comments</h2>
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For programming the RSX I used the package from Miguel I. Garcia Lopez as a example/guideline for building my own RSX and C-function files. You can find his original software on <a href="https://github.com/MiguelVis/RetroProjects" class="urlextern" title="https://github.com/MiguelVis/RetroProjects" rel="nofollow">Github</a> The Multicomp VHDL-Code incl. the CP/M software I've got from <a href="https://www.retrobrewcomputers.org/doku.php?id=builderpages:rhkoolstar:start" class="urlextern" title="https://www.retrobrewcomputers.org/doku.php?id=builderpages:rhkoolstar:start" rel="nofollow">here</a> in the forum. The PCB and the Mini-FPGA-Board can be found <a href="https://retrobrewcomputers.org/doku.php?id=boards:sbc:multicomp:cycloneiv-b:start" class="wikilink1" title="boards:sbc:multicomp:cycloneiv-b:start">here</a> in the forum wiki. One comment regarding the Mini-FPGA-Board: The Multicomp version using the Cyclone-2 chip can't be used with the graphic, because of not having sufficient internal block-RAM (mainly) and LE's.
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The package has reached it's planned basic functionality now. The Reference-Manual, describing the C-functions and the RSX is done.
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<h2>Photo Gallery</h2>
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{{gallery>?photos*_xdemo*.jpg&0 }}
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<h2>File List</h2>
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{{filelist>multicomp*xgraph*0411.tar.gz&style=table&tableheader=1&tableshowdate=1&tableshowsize=1}}{{filelist>multicomp-*vhdl*0215.tar.gz&style=table&tableheader=1&tableshowdate=1&tableshowsize=1}}{{filelist>multicomp*xgraph*1220.tar.gz&style=table&tableheader=1&tableshowdate=1&tableshowsize=1}}
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