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'Perfected' the Activision stack paging detector.

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This commit is contained in:
Thomas Harte 2017-03-12 22:11:58 -04:00
parent 0bcf9c30de
commit b671df9906
1 changed files with 4 additions and 2 deletions
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6
StaticAnalyser/Atari/StaticAnalyser.cpp
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@ -91,10 +91,12 @@ static void DeterminePagingFor2kCartridge(StaticAnalyser::Target &target, const
static void DeterminePagingFor8kCartridge(StaticAnalyser::Target &target, const Storage::Cartridge::Cartridge::Segment &segment, const StaticAnalyser::MOS6502::Disassembly &disassembly)
{
// Activision stack titles have their vectors at the top of the low 4k, not the top, and
// always list 0xf000 as both vectors; they do not repeat them
// always list 0xf000 as both vectors; they do not repeat them, and, inexplicably, they all
// issue an SEI as their first instruction (maybe some sort of relic of the development environment?)
if(
segment.data[4095] == 0xf0 && segment.data[4093] == 0xf0 && segment.data[4094] == 0x00 && segment.data[4092] == 0x00 &&
(segment.data[8191] != 0xf0 || segment.data[8189] != 0xf0 || segment.data[8190] != 0x00 || segment.data[8188] != 0x00)
(segment.data[8191] != 0xf0 || segment.data[8189] != 0xf0 || segment.data[8190] != 0x00 || segment.data[8188] != 0x00) &&
segment.data[0] == 0x78
)
{
target.atari.paging_model = StaticAnalyser::Atari2600PagingModel::ActivisionStack;