Loading routine "cores": Difference between revisions
(Document ROM and Speedlock core loops.) |
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Revision as of 20:27, 28 July 2018
This page documents the "core" of the loading routine used in the various turboloaders: the part of the loader which actually finds an edge from the tape.
ROM loader
The basis for every loading routine out there, this is the one found in the Spectrum ROM (at 05ED). The LD-SAMPLE
name is taken from Logan and O'Hara's The Complete Spectrum ROM Disassembly.
LD-SAMPLE INC B RET Z LD A,7F IN A,(FE) RRA RET NC XOR C AND 20 JR Z,LD-SAMPLE
This routine is used unchanged (just copied elsewhere in memory) by a large number of turboloaders, for example Cybernoid and Dan Dare.
Turboloaders
The names given to each of these loading routines are not meant to imply that loaders was the first to use the specific loading loop; it is the most common usage of the loading loop, or just the first place that it was seen by the authors of this page.
Speedlock
The Speedlock loader, used in huge numbers of games, for example Daley Thompson's Decathlon and Head over Heels.
LD-SAMPLE INC B RET Z LD A,7F IN A,(FE) RRA XOR C AND 20 JR Z,LD-SAMPLE
This is essentially identical to the ROM loader, but just without the RET NC
which aborts if space is pressed during the ROM loading routine.