Genesis Software Manual
Title Page
Genesis Technical Overview - page 1
Genesis Technical Overview - page 2
Genesis Technical Overview - page 3
Table of Contents - page 1
Table of Contents - page 2
Table of Contents - page 3
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I	Memory Map	page 1
	A   Mega Drive 16-bit Mode	page 1
	1        68K Memory Map	page 1
	2        Z80 Memory Map	page 2
	3        68000 Access to Z80 Memory	page 2
	4        I/O Area	page 3
	5        Control Area	page 3
	6        VDP Area	page 4
II	VDP 315-5313	page 5
	A    Terminology	page 6
	B    Display Specification	page 6, 7
	C    VDP Structure	page 8
	1        CTRL	page 8
	2        VRAM	page 8
	3        CRAM	page 8
	4        VSRAM	page 8
	5        DMA	page 8
	D    Interrupt	page 9
	1        Vertical Interrupt (V-INT)	page 9
	2        Horizontal Interrupt (H-INT)	page 9
	3        External Interrupt (EX-INT)	page 10
	E    VDP Port	page 10
	1        $C00000 (Data Port)	page 10
	2        $C00004 (Control Port)	page 11
	3        $C00008 (HV Counter)	page 12
	F    VDP Register	page 13
	1        Mode Set Register No. 1	page 13
	2        Mode Set Register No. 2	page 13
	3        Pattern Name Table Base Address for Scroll A	page 13
	4        Pattern Name Table Base Address for Window	page 13
	5        Pattern Name Table Base Address for Scroll B	page 14
	6        Sprite Attribute Table Base Address	page 14
	7        Background Color	page 14
	8        H Interrupt Register	page 14
	9        Mode Set Register No. 3	page 15
	10      Mode Set Register No. 4	page 15
	11      H Scroll Data Table Base Address	page 16
	12      Auto Increment Table	page 16
	13      Scroll Size	page 16
	14      Window H Position	page 16
	15      Window V Position	page 17
	16      DMA Length Counter Low	page 17
	17      DMA Length Counter High	page 17
	18      DMA Source Address Low	page 17
	19      DMA Source Address Mid	page 17
	20      DMA Source Address High	page 17
	G    Access VDP RAM	page 18
	1        RAM Address Setting	page 18
	2        VRAM Access	page 19, 20, 21
	3        CRAM Access	page 22
	4        VSRAM Access	page 23
	5        Access Timing	page 24
	6        HV Counter	page 25
	H    Access DMA Transfer	page 26
	1        Memory To VRAM	page 26, 27
	2        VRAM Fill	page 28, 29, 30
	3        VRAN Copy	page 31, 32, 33
	4        DMA Transfer Capacity	page 34
	I     Scrolling Screen	page 35, 36
	1        Scrolling Screen Size	page 37, 38
	2        Horizontal Scrolling	page 39, 40
	3        Vertical Scrolling	page 41
	4        Scroll Patter Name	page 42, 43
	5        Pattern Generator	page 44, 45
	J    Window	page 46
	1        Display Position	page 46, 47 , 48, 49
	2        Window Priority	page 50
	3        Window Pattern Name	page 51
	K    Access Sprite	page 52
	1        Display Position	page 53, 54
	2        Sprite Attribute	page 55
	3        Sprite Size	page 56
	4        Sprite Display Capacity	page 57
	5        Priority Between Sprites	page 58, 59
	6        Sprite Pattern Generator	page 60
	L    Priority	page 61, 62, 63 , 64, 65, 66
	M    Color Palette	page 67, 68
	N    Interlace Mode	page 69, 70
III	Backward Compatibility Mode	page 71
	A    Mark III (MS Japan)	page 71
	B    Master System	page 71
	C    RAM Board	page 71
IV	System I/O	page 72
	A    Version Number	page 72
	B    I/O Port	page 72, 73, 74 , 75
	C    Memory Mode	page 76
	D    Z80 Control	page 76
	1        Z80 BusReq	page 76
	2        Z80 Reset	page 76
	E    Z80 Area	page 77, 78
V	VRAM Mapping	page 79, 80, 81 , 82, 83, 84 , 85, 86, 87

Genesis Sound Software Manual
Title Page
Index
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I	Z80 Mapping	page 1
	A    Z80 Map	page 1
	B    Interrupt	page 1
II	68K Control of Z80	page 2
	A    Z80 Start-up	page 2
	A    Z80 Handshake	page 3
III	FM Sound Control	page 3
	A    68K Accesses the FM Sound Source	page 3
	B    Z80 Accesses the FM Sound Source	page 3
IV	PSG Control	page 3
	Overview	page 4
	A Little Bit About Operators	page 5, 6
	Register Overview	page 7
	Envlope Specification	page 8, 9
	Part 1 Memory Map	page 10, 11, 12 , 13, 14, 15, 16 , 17
	Test Program	page 17
	Programmable Sound Generator (PSG)	page 18, 19, 20

 

Genesis Tech Bulletins
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Genesis Tech Bulletin #0	page 1
Genesis Tech Bulletin #1	page 1
Genesis Tech Bulletin #2	page 1
Genesis Tech Bulletin #3	page 1
Genesis Tech Bulletin #4	page 1, 2
Genesis Tech Bulletin #5	page 1, 2, 3
Genesis Tech Bulletin #6	page 1
Genesis Tech Bulletin #11	page 1
Genesis Tech Bulletin #12	page 1
Genesis Tech Bulletin #13	page 1
Genesis Tech Bulletin #14	page 1
Genesis Tech Bulletin #27	page 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Genesis Tech Bulletin #28	page 1, 2
Genesis Tech Bulletin #29	page 1
Genesis Tech Bulletin #29a	page 1
Genesis Tech Bulletin #31	page 1
Genesis Tech Bulletin #32	page 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,

Addendum
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Addendum 1	page 1
Addendum 3	page 1, 2, 3 , 4, 5
Addendum 4	page 1

Software Standards
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Software Standards

page 1, 2, 3 , 4, 5, 6 , 7, 8, 9

Misc
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Manual Correction	page 1
Software Guidelines	page 1, 2
Technical Memo #4	page 1, 2
Misc FAX	page 1