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<p>Hicks: Add Resource: &quot;Amstrad CPC sizecoding collection (32b - 4k)&quot;</p> <hr /> <div>== Amstrad CPC ==<br /> The Amstrad consists of a Z80A @ 4 MHz CPU <br /> <br /> === Setting up ===<br /> <br /> * Cross-Assemblers:<br /> ** [http://www.winape.net/ Winape] has an integrated [http://www.winape.net/help/assembler.html assembler].<br /> ** [https://github.com/z00m128/sjasmplus/releases/latest SjASMPlus] cross-platform assembler supports CPC snapshot and CDT files since v1.18.4.<br /> ** [https://github.com/EdouardBERGE/rasm/releases/latest Rasm] - extremely fast cross-platform Z80 assembler with many features.<br /> ** [https://cpcsdk.github.io/rust.cpclib/basm/ BASM] - a modern Z80 assembler with many features borrowed to mainstream spectrum assemblers, maxam and rasm.<br /> <br /> * Native-assemblers:<br /> ** [http://orgams.wikidot.com/ orgams] - Definitvely the state-of-the-art assembler on Amstrad CPC<br /> <br /> * Emulator(s): <br /> ** [http://www.winape.net/ Winape] is very accurate and includes an assembler / debugger<br /> ** [http://www.roudoudou.com/ACE-DL/ Ace-DL] one of the most accurate emulators / UI is less ergonomic than Winape ATM, but it will improve with time<br /> ** [https://www.cpc-power.com/cpcarchives/index.php?page=articles&amp;num=445 Caprice] gets very regular updates<br /> ** [http://cngsoft.no-ip.org/cpcec.htm CPCEC] is very fast<br /> ** [https://sourceforge.net/projects/javacpc/ JavaCPC] offers many features<br /> ** [https://www.retrovirtualmachine.org/ Retro Virtual Machine] is visually very impressive<br /> ** [https://www.amspirit.fr/ Amspirit] another accurate emulator<br /> <br /> === Video Display ===<br /> No information yet<br /> <br /> === Sound ===<br /> No information yet<br /> <br /> <br /> === Assumed state at start ===<br /> <br /> If the intro is launched with RUN&quot;intro, we can assume those facts<br /> <br /> * CRTC R12/R13 = 0x3000<br /> * 0xC000-0xFFFF is filled with byte 0x00<br /> * screen mode is 1<br /> <br /> <br /> === On the use of Amsdos Header ===<br /> For the smaller sized competitions, the size of the binary is counted as long as you can provide a (basic) loader so that in theory a user can load the binary file from basic (much like the ZX Spectrum).<br /> <br /> In some competitions, Amsdos header counts in the size of the binary. So 128 bytes are lost by definition.<br /> However, there are two small areas that are not used and can embed data ! <br /> They are at position 0x1c (36 bytes) and 0x45 (59 bytes) https://www.cpcwiki.eu/index.php?title=AMSDOS_Header.<br /> <br /> In some conditions, we can access them :<br /> <br /> * If the file (header included) is smaller than 2048-128 bytes, the header is available at address (0xBE7D) + 0xe4 (i.e. 0xbe7d contains an address and 0xe4 bytes later, you have the header). You have access to the two areas<br /> * Otherwise, the BEGINNING of the header is available at address (0xBE7D) + 0x55, and you only have access to the 36 bytes at 0x1c relative position<br /> <br /> === Additional Resources ===<br /> * Amstrad CPC sizecoding collection (32b - 4k) - https://memoryfull.net/files/amstrad-cpc-sizecoding-collection-by-hicks-vanity.7z<br /> * CPC Technical information - https://www.grimware.org/doku.php/documentations/firmware/soft968/start<br /> * CPC Firmware information - https://www.grimware.org/doku.php/documentations/firmware/guide/start<br /> * 64 NOPs Amstrad CPC Tech Blog - https://64nops.wordpress.com/</div>

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