P1 value | What to check |
00h | Executes read / write check of sound D-RAM (4M bits). Note that the DSP is initialized at this time to disable internal memory access. Checks write & read & compare all bits low / high, and the result is stored in the system interface table. |
01h | Executes read / write check of sound D-RAM (8Mbit). Others are as described above. |
02h | Check the operation of the SCSP built-in MIDI. At this time, please short-circuit the external MIDI input / output terminal . The result of the check is as described above. |
03h | A square wave is output from the LR. Note that SCSP slot 025B00000H is forcibly used at this time. This sound is automatically turned off in a few seconds. In addition, Map data, song data, and timbre data are not required for issuing this command. |
04h | A rectangular wave is output only from the L side. Others are as described above. |
05h | A square wave is output only from the R side. Others are as described above. |