SIMPLE-6802
Revision as of 18:32, 16 September 2022 by Blwikiadmin (talk | contribs) (→J2 / J5 - EPROM/EEPROM Select Jumpers)
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Features
- 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
- 0x0000-0x7FFF 32KB SRAM
- 0x8000-0xBFFF Serial (ACIA)
- 0xC000-0xCFFF 16KB EPROM
Headers / Connectors
J1 - RS-232 Serial
- DB-9 Male
- Pinout
- N/C
- Receive
- Transmit
- Loop to pin 6
- GND
- Loop to pin 4
- RTS
- N/C
- N/C
J2 / J5 - EPROM/EEPROM Select Jumpers
| 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
- GND
- RTS* (out)
- +5V
- Receive (in)
- Transmit (out)
- N/C
J4 - 5V Power
- 2x4 header
Software
SmithBUG Builds for SIMPLE-MC6802 CPU Card
- SIMPLE-6802 Wiki Page
- Pre-built for 4KB, 8K, 16KB EPROMs
Building Code
- 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
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
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
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
; 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
