SEGA MEGA KEY?

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, ( ) , , , . , . . , "Mega Key-2" 16- "Sega Mega Drive" "Sega Mega Drive-2". , .

16- "Sega" , - . , , "Super Sonic", "Earth Worm Jim" . , "Sega", , , . "Mega Key" .

, , "Mega Key" " ", , . " "Mega". , 64- : ( "CARTRIDGE" ) .

, , , . , . 1, . , "USA & BRAZIL" , (525 , 60 ). "JAPAN" "Sega" (625 , 50 ). , "PAL & FRENCH SECAM".

1
SA1 SA2
USA&Brazil OFF ON
Japan OFF OFF
PAL&French SECAM ON ON


"Mega Key-2", "Sega Mega Drive", "Sega Mega Drive-2". , . - . " ".

, , , [1]. , , . .



, () , , , . , 64 . , . 29 64 . , , . 1. (A0-A22, WE2) (D0, D6, D7) , (+5 V, GND) "Sega" [2].

  SEGA MEGA KEY?

28- DD1, . . Q1 DD2. , D6 D7 , SA1 SA2. Q2 DD1 VT1, D0 . DD2 5555, VT1 - 3102.

, +5 V , 25...35 . DD1 0,3 . , , , .



- , DD1.

, , , Q1 DD1 "RESET" . Q2 .

, DD1 - , . , () , .

24 224=16777216 . , - . ( ), ( ). . 2 , . .

  SEGA MEGA KEY?
( )

(DD1) 500 . DD2 24- (DD3-DD8), . D0 D6 DD2.1 . (HL1 HL2), , .

0-22. / , "" . WE2 , , , , - . SB1 . DD2.2 DD2.3 "" .

, : 508000H 600002H. SA1 SA2 D6 D7 "" , . - 0 D0. , "" : , .

, 508000H . , , , "Developed for use with NTSC Mega Drive systems only" (" "Mega Drive" NTSC").

DD1, , . 3. : DD1.1 ("-", 508000H) DD1.2 ("", 600002H).

  SEGA MEGA KEY?



, . , , , Q1 DD1 (. 1) E2 DD2. , .

, 12 5612, , 0,5...0,7 . .



, "Mega Key-2", . . 4. "" DD1-DD5. . 8 DD5 10 11 DD4, Q1 8.

  SEGA MEGA KEY?

D0 DD6 "" . D6 D7 .

SA1 SA2 - . , "", "ON" (. 1) , "OFF" - . SA3 .

75x55 (. 5). -0,125, -5, 9-2 53-1.

  SEGA MEGA KEY?

DD1-DD6 155, 555, 1531, 1533 . DD6 5, 3 . , 11, 13, 15 17 , . SA1 SA2 "ON" , - "OFF".

, , , "Mega Key-2", . (, "SYSTEM"), , SA1-SA3. . 2 "SYSTEM" "CARTRIDGE" MC68000.

2
System Cartridge MC68000
A0 A3(6) A17(34) 29
A1 A4(8) A15(30) 30
A2 A5(10) A13(26) 31
A3 A6(12) A11(22) 32
A4 A7(14) A9(18) 33
A5 A8(16) A7(14) 34
A6 A9(18) A5(10) 35
A7 A10(20) A3(6) 36
A8 A11(22) B4(7) 37
A9 A13(26) B5(9) 38
A10 A14(28) A4(8) 39
A11 A15(30) A6(12) 40
A12 A16(32) A8(16) 41
A13 A17(34) A10(20) 42
A14 A18(36) A12(24) 43
A15 A19(38) A14(28) 44
A16 A20(40) A16(32) 45
A17 - B6(11) 46
A18 - B7(13) 47
A19 - B8(15) 48
A20 - B9(17) 50
A21 - B10(19) 51
A22 - B11(21) 52
WE A22(44) B29(57) -
D0 B4(7) A20(40) 5
D6 B10(19) A22(44) 63
D7 B11(21) A19(38) 62
+5 V A26(52) A31(62) 53
GND A12(24) A32(64) 49

, . , SA1, SA2 , , . , "Sega" , , "OFF". "" .

  1. / . . . . - .: . . . . . , 1989. - 751 .
  2. . 16- . - , 1998.
: ., .,

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