Overview and Comparison
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F256Jr
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F256K
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| CPU
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WDC 65C02
WDC 65816S
FNX 6809
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WDC 65C02
WDC 65816S
FNX 6809
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| RAM
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512 KB
Optional 256K RAM expansion module available
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512 KB
Optional 256K RAM expansion module available
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| Flash
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512 KB
Optional 256K Flash Modules
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512 KB
Optional 256K Flash Modules
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| Graphic Chip
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TinyVicky
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TinyVicky
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| Audio
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2 x PSG (Sn76489)
2 x SID socket
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2 x PSG
2 x SID hardware emulation on board
OPL3
CODEC
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| Connections
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1 x DVI (digital & analog)
1 x PS2 (Mouse / External Keyboard)
1 x Commodore syle IEC Port
1 x Headphone 3,5
1 x RCA Line Out
2 x Serial Port Pin-Header
1 x Mini-USB Debug Port
1 x Power 12V / 2A, 2,5mm Barrel Connector
1 x SD Card Slot
2 x Joystick Atari style Pin-Header
1 x PIN-Header onboard for SNES/NES Joystick Connector Box
1 x RAM Expansion Slot (on Top)
1 x JTAG Port for system updates (on bottom)
1 x Wifi Module ESP32 Feather (internal)
1 x Real Time Clock Battery CR2032 (internal)
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1 x DVI (digital & analog)
1 x PS2 (Mouse / External Keyboard)
1 x Commodore syle IEC Port
1 x Headphone 3,5
1 x RCA Line Out
1 x Serial Port DB9M / 1 x Serial Pin Header
1 x Mini-USB Debug Port
1 x Power 12V / 2A, 2,5mm Barrel Connector
1 x SD Card Slot
2 x Joystick Atari style DB9 Connector
1 x Mini-DIN9 for SNES/NES Joystick Connector Box
1 x RAM Expansion Slot (on Top)
1 x JTAG Port for system updates (on bottom)
1 x Wifi Module ESP32 Feather (internal)
1 x Real Time Clock Battery CR2032 (internal)
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Details
CPU
The basic setup of all F256 is the Western Design Center 65C02, a slightly enhanced CMOS version of the very popular 6502 CPUs. The main difference to the 6502 in the 1970s and 1980s is the faster clock speed and the lower power consumption.
The 65C02 can also be replaced with a 65816 as a drop in replacement. Note, however, that while the 65c02 includes the additional Rockwell instructions (BBS/BBR, RMB/SMB), the 65816 does NOT. Therefore, these instructions should be avoided to ensure compatibility with F256 machines using the 65816.
In the F256, the CPU is always clocked at 6,29 MHz (6,293,750 Hz to be exact, derived from 25.175 MHz / 4 as discussed on Discord).
