カテゴリ 重要度 ステータス 解決状況 登録日時 最終更新
仮承認未処理2017-11-24 23:452017-11-29 07:26
 
テスターMrGW担当者 ソースcoco12.cpp
バージョン0.191発生バージョン修正バージョン
フラグ
セット coco, coco2, dragon and clones
セット詳細
coco - Color Computer
dragon - Dragon
 
概 要ある条件でクロック速度が速すぎる。
詳 細The emulated behavior of the SAM/VDG is incorrect in some circumstances. It affects NTSC/PAL machines for Coco 1, 2 and Dragons.
再現手順The following code will issue a double-speed POKE for the whole system:

10 POKE &HFFD9,1
20 GOTO 20

This will cause video screen corruption on a real Coco as the SAM/VDG can't keep up with the refresh rate. XRoar seems to emulate this correctly and you should see the following screen I've attached (screen corruption). The screen in MAME will remain unchanged and you will see the screen intact.
追加情報This issue was discovered while developing assembly code that utilizes the Spec & Sound cartridge.
 
添付ファイルpng fileScreenshot from 2017-11-24 08-38-41.png (2017-11-24 23:45)
png filesn74ls783.png (2017-11-29 07:26)