Do not stay at the Guest Quarters Hotels - Dumping The Miracle Piano Teaching System

I had my Willem programmer pulled out for some Sega Genesis programming stuff and decided to finally dump the eprom inside of the Miracle Piano teaching System Keyboard. If you recall from a previous post of mine, it contained a 27c256 OTP eprom. It also contained many proprietary ICs of which I may never figure out. We may never know what microcontroller they used or what language the machine code is suppose to be written in. z80, 6502, etc.

In any case; with many vintage computers and other devices containing ROM, the authors always find the space to sign and date their work and in rare cases they may even decide to add a little easter egg. Although I cannot locate a date, here is some clear text I found in the ROM image:

"This Eprom contains code created by Mike Collins. Anne Graham and Ray Livingston. Do not stay at the Guest Quarters Hotels. Keep that Coke classic and that Piping hot coffee coming."



I got a real kick out of reading that. For anyone who knows what to do with it, here is the binary file:
http://www.mediafire.com/download/eo3zujca7jvw44f/MPTS_ROM.zip

The Nintedno Gameboy Pocket's CPU pinout

I finally got around to probing the pins on the gameboy pocket's CPU and made a diagram. The CPU is not the same as the CPU inside of the original gameboy or the super gameboy SNES cartridge. When I get the chance, I will draw a schematic of the entire gameboy pocket.

Pinout photo direct link (huge): http://imageshack.com/a/img835/3936/nyix.png

1.  A0
2.  A1
3.  A2
4.  A3
5.  A4
6.  A5
7.  A6
8.  A7
9.  A8
10.  A9
11.  A10
12.  A11
13.  A12
14.  A13
15.  A14
16.  A15
17.  D0
18.  D1
19.  D2
20.  D3
21.  D4
22.  D5
23.  D6
24.  D7
25.  /RES
26.  VIN
27.  SO1
28.  SO2
29.  MD7
30.  MD6
31.  MD5
32.  GND
33.  MD4
34.  MD3
35.  MD2
36.  MD1
37.  MD0
38.  SOUT
39.  SCK
40.  SIN
41.  CPG
42.  CPL
43.  ST
44.  LD0
45.  LD1
46.  CP
47.  FR
48.  S
49.  MA0
50.  MA1
51.  MA2
52.  MA3
53.  VCC
54.  MA4
55.  MA5
56.  MA6
57.  MA7
58.  MA12
59.  /MCS
60.  MA10
61.  /MRD
62.  MA11
63.  MA9
64.  MA8
65.  /MWR
66.  CK2
67.  CK1
68.  P15
69.  P14
70.  P13
71.  P12
72.  GND
73.  P11
74.  P10
75.  GND
76.  GND
77.  CLOCK-OUT
78.   /WR
79.   /RD
80.   /CS

Some notes:

• The naming convention that I followed is directly from the silkscreen on the gameboy pocket itself. 
• It would seem that the gameboy pocket's CPU has the video RAM built-in as opposed to being on the PCB since the vram buses are all hanging open. Because of this, rewiring a DMG-01's CPU or a Super Gameboy CPU to the gameboy pocket is not immediately possible. 
•  The DMG and SGB CPU's have two pins named T1 and T2 which are tied to ground. I believe that pins 75 and 76 of the MGBCPU  are T1 and T2 respectively, but only because of their placement near the clock output. 
• The "/" means low-enable
• For more information what some of the pins do, see the photo near the top. Or comment below.