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Extend enum.

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This commit is contained in:
Thomas Harte 2022-12-27 22:20:47 -05:00
parent 99ced5476f
commit 2ab4b351ca
2 changed files with 17 additions and 1 deletions
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15
Components/9918/9918.cpp
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@ -33,7 +33,20 @@ using namespace TI::TMS;
// 1368 = 2 * 2 * 2 * 3 * 3 * 19 // 1368 = 2 * 2 * 2 * 3 * 3 * 19
// //
// => 2^3 * 3^2 * 5 * 19 = 6840 // => 2^3 * 3^2 * 5 * 19 = 6840
// ... which // ... which would imply a multiply by 30 on the input clock if
// it were to remain 3.58Mhz.
// Mega Drive notes, assorted:
//
//
//
// there are 60 EDCLK at MCLK/5 during a line ... like this:
//
// 15 @ /5; 2 @ /4; 15 @ /5; 2 @ /4; 15 @ /5; 2 @ /4; 15 @ /5
//
// ... HSYNC signal is what triggers the changes in EDCLK frequency, with some latency though.
//
// The total is still 840 EDCLKS (420 pixels) with 780 @MCLK/4 and 60@MCLK/5 (total is 3420 MCLCKS).
namespace { namespace {

3
Components/9918/Implementation/9918Base.hpp
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@ -24,9 +24,12 @@ enum Personality {
TMS9918A, // includes the 9928 and 9929; set TV standard and output device as desired. TMS9918A, // includes the 9928 and 9929; set TV standard and output device as desired.
V9938, V9938,
V9958, V9958,
// Sega extensions.
SMSVDP, SMSVDP,
SMS2VDP, SMS2VDP,
GGVDP, GGVDP,
MDVDP,
}; };
enum class TVStandard { enum class TVStandard {