Bison_FPGA is multi inteface for zx spectrum and compatible computers, connected to edge connector. Device includes:
DivTIESUS by Miguel Angel Rodríguez Jódar (open source version withs some changes )
DivMMC compatible interface with 8 KiB of EEPROM and 512 kB of RAM. Standard utils for EEPROM flashing, as provided by the ESXDOS team, are compatible with DivTIESUS.
Model autodetection. This means you don't need to put a jumper, or flip a switch to change from using it with a Spectrum 48K and a +3.
It uses its own fast clock (28 MHz / 14 Mhz), so Bison does not need the CPU clock at all
high quliaty push/pull MOLEX microSD card slot
SLIDE switch is used to indicate BISON that the EEPROM can be flashed (JP2 equivalent) and the automapping feature is disabled.
ESXDOS shadowing does not collide with all-RAM feature in +2A/B/3 machines. If the system is in all-RAM mode, ESXDOS ROM mapping is disabled.
Soft +3E feature: BISON is able to load +3E ROM images from the SD card, install them as the system ROM (using its own RAM), and make them available to the computer, while disabling the automapping feature (needed for ESXDOS but not for +3eDOS). This, effectively, allows the user to operate his/her +2A/B/3 machine as a +2e/3e one, all without having to open the case and exchange ROMs. A new dot command, ".go3e" makes this possible. Such command only works with DivTIESUS and BISON
Soft ROM feature: the soft +3E feature can also be used to load any 16K, 32K or 64K ROM and make the computer to boot with that ROM (the dot command currently supports only 16K ROMs). This means that ROM images for some util/games available for the Spectrum can be run in their original form. No need to have a +2A/B/3 machine to use them.
Beeper / ULA (since firmware 1.5 also TAPE OUT) sound mixed at audio output
Soundrive / covox x 4
Joystick port working in 8 modes , also in KEMPSTON MOUSE mode- Amiga/ATARI ST mice can be used
Reset/ joyport mode controlled by small avr
Turbo sound - 2 x AY 3-8912 chips ( fpga implementation).
TURBOSOUND - 2 x AY
SOLO AY
Soundrive / covox x 4
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