From 81b00c6d976d3cbc5908b3416cd8b6a426d7b0b3 Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Thu, 26 Jan 2023 22:25:10 -0500
Subject: [PATCH] Add notes.
---
Components/9918/Implementation/9918.cpp | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
diff --git a/Components/9918/Implementation/9918.cpp b/Components/9918/Implementation/9918.cpp
index 3ee65c7a2..01a380e73 100644
--- a/Components/9918/Implementation/9918.cpp
+++ b/Components/9918/Implementation/9918.cpp
@@ -856,20 +856,20 @@ void Base<personality>::commit_register(int reg, uint8_t value) {
// handled above.
default: break;
- case 0b0100: break; // TODO: point.
+ case 0b0100: break; // TODO: point. [read a pixel colour]
case 0b0101: Begin(PointSet); break;
- case 0b0110: break; // TODO: srch.
+ case 0b0110: break; // TODO: srch. [search horizontally for a colour]
case 0b0111: Begin(Line); break;
- case 0b1000: break; // TODO: lmmv.
- case 0b1001: break; // TODO: lmmm.
- case 0b1010: break; // TODO: lmcm.
- case 0b1011: break; // TODO: lmmc.
+ case 0b1000: break; // TODO: lmmv. [logical move, VDP to VRAM]
+ case 0b1001: break; // TODO: lmmm. [logical move, VRAM to VRAM]
+ case 0b1010: break; // TODO: lmcm. [logical move, VRAM to CPU]
+ case 0b1011: break; // TODO: lmmc. [logical move, CPU to VRAM]
- case 0b1100: break; // TODO: hmmv.
- case 0b1101: break; // TODO: hmmm.
- case 0b1110: break; // TODO: ymmm.
- case 0b1111: break; // TODO: hmmc.
+ case 0b1100: break; // TODO: hmmv. [high-speed move, VRAM to VDP]
+ case 0b1101: break; // TODO: hmmm. [high-speed move, VRAM to VRAM]
+ case 0b1110: break; // TODO: ymmm. [high-speed move, y only, VRAM to VRAM]
+ case 0b1111: break; // TODO: hmmc. [high-speed move, CPU to VRAM]
}
#undef Begin