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Memory Map

The following is a memory map that was generated based on the MAME source code (.180).  This information is only as accurate as the MAME driver is.  If you see any errors, please let me know what that error is.
 
The Memory Area is related to where the information is from (CPU, Sound Board, etc..), and it may also reflect what it has in common with other hardware.
Jump Bug (Hoei (Rock-Ola license), 1981)
Memory Area:galaxian_map_base
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x4000-0x43FF1024Mirror, RAM0x0400,
0x5000-0x53FF1024Mirror, RAM Write, Shared0x0400, galaxian_videoram_w, videoram
0x5800-0x58FF256Mirror, RAM Write, Shared0x0700, galaxian_objram_w, spriteram
0x60001Mirror, Read Port0x07ff, IN0
0x0001Coin 1Active High
0x0002Joystick UpActive High
0x0004Joystick LeftActive High
0x0008Joystick RightActive High
0x0010Button 1Active High
0x0000UprightActive High
0x0020CocktailActive High
0x0040Joystick DownActive High
0x0080Joystick UpActive High
0x6000-0x60012Mirror, Write0x07f8, start_lamp_w
0x60021Mirror, Write0x07f8, coin_lock_w
0x60031Mirror, Write0x07f8, coin_count_0_w
0x68001Mirror, Read Port0x07ff, IN1
0x0001Start 1Active High
0x0002Start 2Active High
0x0004Joystick LeftActive High
0x0008Joystick RightActive High
0x0010Button 1Active High
0x0020Coin 2Active High
0x0000HardActive High
0x0040EasyActive High
0x0080Joystick DownActive High
0x70001Mirror, Read Port0x07ff, IN2
0x00013Active High
0x00024Active High
0x00035Active High
0x0000Infinite (Cheat)Active High
0x0004A 2C/1C B 2C/1CActive High
0x0008A 2C/1C B 1C/3CActive High
0x0000A 1C/1C B 1C/1CActive High
0x000cA 1C/1C B 1C/6CActive High
0x00f0UnusedActive High
0x70011Mirror, Write0x07f8, irq_enable_w
0x70041Mirror, Write0x07f8, galaxian_stars_enable_w
0x70061Mirror, Write0x07f8, galaxian_flip_screen_x_w
0x70071Mirror, Write0x07f8, galaxian_flip_screen_y_w
0x78001Mirror, Device Read0x07ff, watchdog, watchdog_timer_device, reset_r
Memory Area:jumpbug_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x4000-0x47FF2048RAM
0x4800-0x4BFF1024Mirror, RAM Write, Shared0x0400, galaxian_videoram_w, videoram
0x5000-0x50FF256Mirror, RAM Write, Shared0x0700, galaxian_objram_w, spriteram
0x58001Mirror, Device Write0x00ff, 8910.0, ay8910_device, data_w
0x59001Mirror, Device Write0x00ff, 8910.0, ay8910_device, address_w
0x60001Mirror, Read Port0x07ff, IN0
0x0001Coin 1Active High
0x0002Joystick UpActive High
0x0004Joystick LeftActive High
0x0008Joystick RightActive High
0x0010Button 1Active High
0x0000UprightActive High
0x0020CocktailActive High
0x0040Joystick DownActive High
0x0080Joystick UpActive High
0x6002-0x60065Mirror, Write0x07f8, galaxian_gfxbank_w
0x68001Mirror, Read Port0x07ff, IN1
0x0001Start 1Active High
0x0002Start 2Active High
0x0004Joystick LeftActive High
0x0008Joystick RightActive High
0x0010Button 1Active High
0x0020Coin 2Active High
0x0000HardActive High
0x0040EasyActive High
0x0080Joystick DownActive High
0x70001Mirror, Read Port0x07ff, IN2
0x00013Active High
0x00024Active High
0x00035Active High
0x0000Infinite (Cheat)Active High
0x0004A 2C/1C B 2C/1CActive High
0x0008A 2C/1C B 1C/3CActive High
0x0000A 1C/1C B 1C/1CActive High
0x000cA 1C/1C B 1C/6CActive High
0x00f0UnusedActive High
0x70011Mirror, Write0x07f8, irq_enable_w
0x70021Mirror, Write0x07f8, coin_count_0_w
0x70041Mirror, Write0x07f8, galaxian_stars_enable_w
0x70061Mirror, Write0x07f8, galaxian_flip_screen_x_w
0x70071Mirror, Write0x07f8, galaxian_flip_screen_y_w
0x8000-0xAFFF12288ROM
0xB000-0xBFFF4096Readjumpbug_protection_r
 

ROM Map for this game

 
This is the ROM map for the game.  This should tell you what address the ROM is at, how big it is, what it's used for.   
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048jblCRC(9a091b0a) (Fluke: FFCD)
0x0800-0x0FFF2048jbmCRC(8a0fc082) (Fluke: 5538)
0x1000-0x17FF2048jbnCRC(155186e0) (Fluke: F0A9)
0x1800-0x1FFF2048jbiCRC(7749b111) (Fluke: 06D3)
0x2000-0x27FF2048jbjCRC(06e8d7df) (Fluke: 4B17)
0x2800-0x2FFF2048jbkCRC(b8dbddf3) (Fluke: B31F)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096jb1CRC(415aa1b7) (Fluke: 2B04)
0x1000-0x1FFF4096jb2CRC(b1c27510) (Fluke: 7994)
0x2000-0x2FFF4096jb3CRC(97c24be2) (Fluke: B5E3)
0x3000-0x3FFF4096jb4CRC(66751d12) (Fluke: A39B)
0x8000-0x8FFF4096jb5CRC(e2d66faf) (Fluke: 2C09)
0x9000-0x9FFF4096jb6CRC(49e0bdfd) (Fluke: 2A57)
0xA000-0xA7FF2048jb7CRC(83d71302) (Fluke: FE57)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32l06_prom.binCRC(6a0c7d87) (Fluke: 9DB9)
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