6502/CLK
1
0
Fork 0
mirror of https://github.com/TomHarte/CLK.git synced 2024-11-26 08:49:37 +00:00
Code Issues Projects Releases Wiki Activity

Merge branch 'MSX2' of github.com:TomHarte/CLK into MSX2

Browse Source
This commit is contained in:
Thomas Harte 2023-01-30 21:06:23 -05:00
commit 30a2b1611f
1 changed files with 10 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
Components/9918/Implementation/9918.cpp
View File

@ -1020,7 +1020,16 @@ uint8_t Base<personality>::read_register() {
default:
case 0: break;
case 1: LOG("TODO: Yamaha status 1"); break;
case 1:
// b7 = light pen; set when light is detected, reset on read;
// or: mouse button 2 currently down.
// b6 = light pen button or mouse button 1.
// b5–b1 = VDP identification (1 = 9938; 2 = 9958)
// b0 = set when the VDP reaches the line provided in the line interrupt register.
// Reset upon read.
return
personality == Personality::V9938 ? 0x2 : 0x4;
break;
case 2: {
// b7 = transfer ready flag (i.e. VDP ready for next transfer)