polyphonic squarewave mini-keyboard with audiogames

This keyboard of 1982 (manual copyright date) is almost identical with Yamaha HS-500, but has a yellow case and different audiogames those show musical notes instead of alphabet letters on the LCD. Also the "violin" and "harpsichord" preset sounds are duller due to an additional filter hybrid.

different main features:

• different 3 OBS audiogames
• LCD display indicate musical notes (black dots) instead of alphabet letters
• multi-chip hardware:
• sound CPU= "Yamaha YM1036A, 28 2055" (24 pin DIL, crystal clocked @ 240kHz "system clock"?)
• game CPU= "IG08060, 8233XK" (64 pin SMD, crystal clocked @ 32.768kHz "count clock"?)
• filter hybrid= "IG08050, 29A7" (8 pin SIL)

eastereggs:

• test mode: Hold down "game 1" button during power-on to start the LCD test mode. This modes repeatedly lights up all segments from left to right; the keyboard works like normal during this. (Yamaha HS-500 does this differently.)

notes:

• game 1: "Keyboard Says..."

This game works similar like Senso or Simon. The instrument plays a monophonic note sequence (also shown on LCD) and the player has to repeat it on the keyboard. When he plays it perfectly, he gets 100 points, else less according to the number of mistakes. Correcting a wrong note immediately scores 95 points. So long you score >80 points per round, the game continues until the count of notes reaches 16. First it is only 1 note, but after every try a further note is added, making the sequence longer and longer. The game ends when the player makes too many mistakes. For up to 4 notes any mistake ends the game; for 5 to 9 notes 1 mistake and above 9 notes 2 or 3 mistakes are allowed (so long the score is >80 points per round). From 9 notes on the note range widens between C and C and a fanfare sounds after game end. The maximum possible score is 1600.

• game 2: "Keyboard Poker"

The instrument plays an ascending or descending scale while it displays the corresponding note; when the scale reaches its end, it reverses. This way it goes up and down and up again while it turns faster at every turning point. The player has to hit a corresponding key before it turns too fast or a timeout (when it has moved 64 times). Each level consists of 4 notes. You have to stop as many notes as possible at the same height; the game continues only when you line up 3 or 4 matching notes (named "three cards" or "four cards" in the manual). The 4th note in a round moves faster when you lined up 3 correctly. Lining up 4 notes scores 500. Lining up 3 scores 300 points. Lining up 2 pairs of notes scores 200 and 1 pair scores 100. Each level is faster than the previous one. The maximum possible score is 10000. A final score above 1000 sounds a fanfare.

• game 3: "Keyboard Invader"

A repeating signal will sound at the pitch of a certain note (displayed to the left on the LCD). To the right, your "cannon" appears as another note. The player has to hit the correct key corresponding to the enemy "invader" note to shoot it. (The "cannon" will instantly move to the height of the note of the pressed key and another note flies out of it to the left as a missile). Shooting an invader scores 50 points. When the player waits too long, the invader note will fire a missile to the right; when the cannon gets hit, the player looses a life. Thus the player has to hit another key to avoid the invader's missile. (Initially the player has 3 lives, those are indicated by note icons to the lower right of the display.) When player's and invader's missile collide, the one who shot first wins. By not looking at the staff display until you score up to 1000 points, you can train your hearing. Between 2000 and 5000 points it is possible to win bonus live. After 2000 and 5000 points the game turns more difficult. After 2000 points the note range increases between C and C. Reaching a score >1000 sounds a fanfare. The maximum possible score is 10000.

removal of these screws voids warranty...
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