SIMPLE-6802

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SIMPLE-6802 REV1 FRONT (BLK).png

Features[edit]

  • 68B02 CPU
    • 1.8432 MHz clock
    • MC6802 is fully compatible with MC6800 but without messy two-phase clocking
  • 32KB SRAM
  • 16KB EPROM/EEPROM
    • 16KB reserved
    • 8KB (28C64 parts can be used)
  • 68B50 Serial Port (ACIA)
    • RS-232 port
    • Header for FTDI
    • 115,200 baud
  • Reset switch with optional Power Supervisor
  • 95x95mm card
  • (4) 6-32 mounting holes

Memory Map[edit]

  • 0x0000-0x7FFF 32KB SRAM
  • 0x8000-0xBFFF Serial (ACIA)
  • 0xC000-0xCFFF 16KB EPROM

Chipset[edit]

Headers / Connectors[edit]

SIMPLE-6802 REV1 CAD.PNG

J1 - RS-232 Serial[edit]

  • DB-9 Male
  • Pinout
  1. N/C
  2. Receive
  3. Transmit
  4. Loop to pin 6
  5. GND
  6. Loop to pin 4
  7. RTS
  8. N/C
  9. N/C

J2 / J5 - EPROM/EEPROM Select Jumpers[edit]

SIMPLE-6802 J2 J5.PNG

27512 27256 27128 2764 28C64 PIN PIN 2764 28C64 27128 27256 27512
A15 VPP VPP VPP N/C 1 (J2) 28 VCC VCC VCC VCC VCC
A12 A12 A12 A12 A12 2 27 (J5) PGM WE* PGM A14 A14
A7 A7 A7 A7 A7 3 26 A13 N/C A13 A13 A13
A6 A6 A6 A6 A6 4 25 A8 A8 A8 A8
A5 A5 A5 A5 A5 5 24 A9 A9 A9 A9
A4 A4 A4 A4 A4 6 23 A11 A11 A11 A11
A3 A3 A3 A3 A3 7 22 OE* OE* OE* OE*
A2 A2 A2 A2 A2 8 21 A10 A10 A10 A10
A1 A1 A1 A1 A1 9 20 CE* CE* CE* CE*
A0 A0 A0 A0 A0 10 19 D7 D7 D7 D7
D0 D0 D0 D0 D0 11 18 D6 D6 D6 D6
D1 D1 D1 D1 D1 12 17 D5 D5 D5 D5
D2 D2 D2 D2 D2 13 16 D4 D4 D4 D4
GND GND GND GND GND 14 15 D3 D3 D3 D3

J3 - FTDI / TTL Serial[edit]

  1. GND
  2. RTS* (out)
  3. +5V
  4. Receive (in)
  5. Transmit (out)
  6. N/C

J4 - 5V Power[edit]

  • 2x4 header

Software[edit]

SmithBUG Builds for SIMPLE-MC6802 CPU Card[edit]

Building Code[edit]

  • Uses a68 assembler
    • Command line makes S-Record output
  • Use srec_cat to shift from EPROM absolute addresses to 0x0000 as HEX file

4KB Build[edit]

A68 SMITHBUG_SIMPLE-6802_F000.ASM -l SMITHBUG_SIMPLE-6802_F000.LST -s SMITHBUG_SIMPLE-6802_F000.S
srec_cat SMITHBUG_SIMPLE-6802_F000.s -offset - -minimum-addr SMITHBUG_SIMPLE-6802_F000.s -o smithbug_F000.hex -Intel

8KB Build[edit]

A68 SMITHBUG_SIMPLE-6802_E000.ASM -l SMITHBUG_SIMPLE-6802_E000.LST -s SMITHBUG_SIMPLE-6802_E000.S
srec_cat SMITHBUG_SIMPLE-6802_E000.s -offset - -minimum-addr SMITHBUG_SIMPLE-6802_E000.s -o smithbug_E000.hex -Intel

16KB Build[edit]

A68 SMITHBUG_SIMPLE-6802_C000.ASM -l SMITHBUG_SIMPLE-6802_C000.LST -s SMITHBUG_SIMPLE-6802_C000.S
srec_cat SMITHBUG_SIMPLE-6802_C000.s -offset - -minimum-addr SMITHBUG_SIMPLE-6802_C000.s -o smithbug_C000.hex -Intel

SmithBUG Commands[edit]

;	M	MOVE MEMORY
;	E	CHANGE MEMORY
;	G	GO TO PROGRAM
;	R	PRINT
;	T	TRACE PROGRAM
;	@	ASCII CONVERSION
;	H	PRINTER ON
;	V	VIEW MEMORY
;	I	FILL MEMORY
;	J	JUMP TO TARGET PROGRAM
;	F	FIND 
;	Q	HARDWARE LOCATION
;	D	DISASSEMBLE CODE
;	K	CONTINUE AFTER BREAK
;	1	BREAKPOINT ONE
;	2	BREAKPOINT TWO
;	&	S1 LOAD PROGRAM
;	*	HARDWARE LOCATION (TBA)
;	O	ECHO ON
;	N	ECHO OFF

Mechanicals[edit]

SIMPLE-6802 REV1 MECHS.PNG

Assembly Sheet[edit]

SIMPLE-6802 Rev 1 Assembly Sheet