Back Fire (Tecmo) 1988

This japanese romset comes from a bootleg pcb.Rare than the original.

Hardware info: detailed
main cpu Z80A
sound cpu Z80A* see note
sound ic ym3812 + 3014
Osc 8Mhz and 24Mhz
-ram (cpu board):
6264 main/work
6116 (sub pcb*),6116, 2114 x3 sound
6116 character
-ram (video board):
6116 scroll
6116 foreground
6116 background
4164 x20 object/sprites
Rom definition:
B4,B5 main program
B2 sound program
B3 character gfx
B6 to B9 object gfx
B10 to B13 foreground gfx
B14 to B17 background gfx

All eprom/rom are 27256,27512

*Note:The sound cpu was protected inside a epoxy block fit on a 40 pin socket in reverse of cpu board (solder side).By dissolving resin the small sub pcb contains Z80A (identified by pins),76c28 (6116),a 74ls00 and 74ls138.

-Controls:
This game uses 8way joystick and one button (shot).Hardware accept inputs by other two buttons as the jamma standard,but their function is the same of first one.

-Dip switch settings:
DIP 1
SW 1-2 coin slot 1 (max 9 credits)
off off 1 coin 1 play
on off 1 coin 2 play
off on 1 coin 3 play
on on 1 coin 6 play
SW 3-4 coin slot 2 (max 99 credits)
off off 1 coin 1 play
on off 2 coin 1 play
off on 1 coin 2 play
on on 1 coin 3 play
SW 7 table-upright
off table
on upright
SW 5-6-8 not used
DIP 2
SW 1-2-3 extend
off off off 50,200,500k
on off off 100,300,800k
off on off 50,200k
on on off 100,300k
off off on 50k
on off on 100k
off on on 200k
on on on nothing
SW 4-5-6 difficulty
off off off normal
on off off  hard 1
off on off    |
on on off     |
off off on    |
on off on     |
off on on     |
on on on   hardest
SW 7 continue
off yes
on no
SW 8 invincibility (test mode)** see note
off no -normal game
on yes
** It is not total, in normal waves you die by collision with bosses shot,and with walls and enemies in cavern waves and final base.
In normal waves,you cannot get special weapon objects too.

Demo sound is always active by default.Dip switch are good by testing.
Dip switch changes apart for coin settings are immediately effective (by next play and during play),no need of turn off/on power.

Dumped tested and edited by tirino73 >isolani@interfree.it<