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Loading routine "cores": Difference between revisions
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(Document the Search Loader(s?).) |
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Again just a one-byte change from the ROM loader, replacing the <code>RET NC</code> with Alkatraz's <code>RET Z</code>. | Again just a one-byte change from the ROM loader, replacing the <code>RET NC</code> with Alkatraz's <code>RET Z</code>. | ||
=== Dinaload === | |||
Used by Dinamic, for example in [https://spectrumcomputing.co.uk/index.php?cat=96&id=295 Astro Marine Corps] and [https://spectrumcomputing.co.uk/index.php?cat=96&id=1863 Freddy Hardest en Manhattan Sur]. | |||
LD-SAMPLE INC B | |||
RET Z | |||
LD A,FF | |||
IN A,(FE) | |||
RRA | |||
RET NC | |||
XOR C | |||
AND 20 | |||
JR Z,LD-SAMPLE | |||
Yet another one-byte change from the ROM loader, this time ensuring that no keyboard half-rows are read, meaning the <code>RET NC</code> will never trigger. | |||
=== Search Loader === | === Search Loader === | ||
Used | Used in [https://spectrumcomputing.co.uk/index.php?cat=96&id=584 Blood Brothers] and [https://spectrumcomputing.co.uk/index.php?cat=96&id=978 City Slicker]. | ||
LD-SAMPLE INC B | LD-SAMPLE INC B | ||
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While this maintains the distinctive <code>AND 40</code> of the Search Loader, I suspect it's actually an independent derivation. | While this maintains the distinctive <code>AND 40</code> of the Search Loader, I suspect it's actually an independent derivation. | ||
=== Digital Integration === | |||
Unsurprisingly enough, used by Digital Integration in some of their games, for example [https://spectrumcomputing.co.uk/index.php?cat=96&id=305 ATF] and [https://spectrumcomputing.co.uk/index.php?cat=96&id=5317 Tomahawk]. | |||
LD-SAMPLE DEC B | |||
RET Z | |||
IN A,(FE) | |||
XOR C | |||
AND 40 | |||
JP Z,LD-SAMPLE | |||
This loader has two points of note: it inverts the counter (which just requires the flip of a condition outside this loop when working out whether it's a long or short pulse), and it's probably the minimal loop which is possible while still being anything even vaguely similar to the ROM loader. | |||
== Emulation == | |||
[http://fuse-emulator.sourceforge.net/ Fuse] pattern matches for the above cores to implement its "accelerate loaders" feature. | |||