Difference between revisions of "LB-6809-01"
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* [https://github.com/land-boards/lb-boards/blob/master/RetroCPUs/SIMPLE-6809/SOFTWARE/ExBasROM.hex ExBasROM.hex] | * [https://github.com/land-boards/lb-boards/blob/master/RetroCPUs/SIMPLE-6809/SOFTWARE/ExBasROM.hex ExBasROM.hex] | ||
| − | * Mostly works | + | * Mostly works |
| − | * | + | ** hangs after input sometimes |
| − | * CTRL-C stops running program but hangs | + | ** CTRL-C stops running program but hangs |
| + | ** Ran long loop and it worked | ||
* Reset/warm start works | * Reset/warm start works | ||
* BASIC does not use ints, from src code | * BASIC does not use ints, from src code | ||
Revision as of 13:03, 10 September 2024
Features
- 68B09 CPU
- 8 MHZ crystal on card
- CPU runs at 2 MHz
- Reset switch/power monitor
- Address decoder PLD drives RAM/ROM/IO chip selects
- 100x50mm card
Memory Map
- 0x0000-0x7FFF 32KB SRAM
- 0x8000-0x9FFF Free Space (8KB)
- 0xA000-0xBFFF Serial (ACIA)
- 0xC000-0xFFFF 16KB EPROM
Design
68B09 CPU
- 8 MHz clock
- Runs effectively at 2 MHz
CPU
CPU Timing
Clock
Crystal
- Uses CPU internal oscillator
PLD
- ATF16V8B part
- TL866ii Plus Programmer
PLD Listing
- Latest PLD source code here
- Added code to blink LED
Name LB-6809-01_PLD; Partno ATF16V8B; Date 09/05/24; Revision 01; Designer DOUG G; Company LAND BOARDS LLC; Assembly LB680901_U2; Location Rustbelt, US; Device G16V8; /* */ /* Control inputs */ PIN 1 = CLK; PIN 2 = CPUA12; PIN 3 = CPUA13; PIN 4 = CPUA14; PIN 5 = CPUA15; PIN 6 = CPUREAD; PIN 7 = VPB; /* Added as wire on Rev 1 PCB */ PIN 8 = VPA; PIN 9 = VDA; PIN 11 = D0; /* Address Decode and Chip Select outputs */ PIN 12 = !ROMCS; PIN 13 = !IOCS; PIN 14 = !MEMRD; PIN 15 = LED; PIN 16 = !RAMCS; PIN 17 = LEDSTR; PIN 18 = RDY; ROMCS = CPUA15 & CPUA14 & CPUREAD; LEDSTR = CPUA15 & CPUA14 & !CPUREAD & VPB; LED = LEDSTR & D0 # LED & !LEDSTR; RAMCS = !CPUA15 & CPUREAD /* 0x0000-0x7FFF 32KB SRAM */ # !CPUA15 & !CPUREAD & VPB # CPUA15 & !CPUA14 & !CPUA13 & CPUREAD /* 0x8000-0x9FFF Free (8KB */ # CPUA15 & !CPUA14 & !CPUA13 & !CPUREAD & VPB; IOCS = CPUA15 & !CPUA14 & CPUA13 & VPB; /* 0xA000-0xBFFF Serial (ACIA) */ RDY = VPB; MEMRD = CPUREAD;
Backplane connector
Software
- LB-6809 code examples
- asm6809 - portable cross assembler targeting the Motorola 6809
- Features arbitrarily complex expressions (with most C-style operators available), forward references, macro expansion and conditional assembly
- Output formats are: Motorola SREC, Intel HEX (and others)
- asm6809 Manual
- Using asm6809 version 2.13
- asm6809-2.13-w64 Local copy
- MC6809-MC6809E 8-Bit Microprocessor Programming Manual (M6809PM/AD) © Motorola Inc., 1981
- MC6809 Rference Card
Build 6809 Assembly Code (Windows 64-bit)
- Run asm6809 in Windows CMD prompt window
[path_to_asm6809.exe_program\]asm6809 loop.asm -H -l -o loop.hex
- -H option creates hex record file to download to programmer
- -l fileName option creates listing file
- -o filename option followed by output file name
Programming using TL866
- Set From File Start(Hex) to 0x0C000 when loading hex record file into TL866i Plus programmer
ROM access test code (loop.asm)
- Assemble loop.asm
- my path below, YMMV
..\..\M6809_Assembler\asm6809-2.13-w64\asm6809 loop.asm -H -l loop.lst -o loop.hex
- Source code (loop.asm)
ORG $C000 RESVEC BRA RESVEC ORG $FFFE LBFFE FDB RESVEC ; RESET
- .hex file
:02C0000020FE20 :02FFFE00C00041 :00000001FF
LED Blink code (blink.asm)
- Added PLD code to make a trigger on pin 17 when EPROM address 0xC000-0xF000 is written
- Code doesn't use any RAM (CPU and EPROM only)
- LED is on U2-15 to GNS w/ 1.8K resistor
- Assemble blink.asm code
- See Rev 2 checkout notes for LED
- my path below, YMMV
..\..\M6809_Assembler\asm6809-2.13-w64\asm6809 blink.asm -H -l blink.lst -o blink.hex
- Works, blinks LED at about 2 Hz
- Can use this as a SRAM test outout
- Fast blink = Fail
- Slow blink = Pass
SRAM Test (ramLoop.asm)
- ramLoop.asm - GitHub
- Loops on SRAM write/read on LB-6809-01 card
- Turn on LED if the test passes
- Turn off LED if the test fails
- Passes
SRAM Test (ramTest1.asm)
- ramTest1.asm - GitHub
- Write/read SRAM write/read single location on LB-MEM-02 card
- Blink LED slowly if the test passes
- Blink LED quickly if the test fails
- Passes
SRAM Test (ramTest.asm)
- ramTest.asm - GitHub
- Write/read SRAM write/read on all SRAM on LB-MEM-02 card
- Test single location with 0x55/0xaa
- Test all RAM with ramp
- Tests all locations but repeats ever 256 bytes so addresses are not completely tested
- Ramp upper 7 address lines with a ramp
- Blink LED slowly if the test passes
- Blink LED quickly if the test fails
- Test takes 0.6 secs
- Passes
ACIATest.asm
- AciaTest.asm
- Wrote code with Microsoft Pilot with minor modifications
- Required etch cut and added wire on LB-68B50-02 card
- Test with FTDI-49MM card
- 115,200 baud, No parity ,8 data bits, 1 stop bit
- Loops back data typed in
- Works
Microsoft Extended BASIC
- ExBasROM.hex
- Mostly works
- hangs after input sometimes
- CTRL-C stops running program but hangs
- Ran long loop and it worked
- Reset/warm start works
- BASIC does not use ints, from src code
RTS_LOW EQU $15 ; 6850 ACIA CONTROL REGISTER: RX INT DISABLED, RTS LOW, TX INT DISABLED, 8N1, CLK/16
- Code does not do initialization of the ACIA
- Message when it runs
6809 EXTENDED BASIC (C) 1982 BY MICROSOFT OK
- PuTTY settings
- Test software
10 FOR I =1 TO 10000 20 PRINT I 30 NEXT I
- Time ~49 secs
Reference Designs
- MP-09 MONITOR - SWTBUG SBUG monitor for the 6809
- SIMPLE-6809 Software - reference software that runs on SIMPLE-6809
Mechanicals
Rev 2
Checkout
Rev 2 Checkout
- Built
- Worked with NOP Tester
- Got 8 MHz crystal
- E signal is 2 MHz- good
- Add LED that can be written under program control
- Add wire U1-31 to U2-11 (D0)
- Add LEDSTR when strobe write to 0xC000-0xFFFF (U2-17)
- Add LED to U2-15 with 1.8K resistor
- Write to 0xF000 to toggle the line
- Bit D0
- Running blink.asm code
Rev 2 PCB Changes from Rev 1
- Add U1-34 to U2-7 (VPB/E)
- Eliminate oscillator
- Add 8 MHz crystal/caps
- Cheaper and easier to find
- Add 4.7K pullup to U1-40 (ABORT*/HALT) line
- Change resistor values to lighten up Iol
- Beef up power plane connections to J1 and CPU/cap
- Move reset switch to the top of the board (where the oscillator used to be)
Rev 1 Checkout Notes
- Did not build
- Add wire U1-34 to U2-7 (VPB/E)
- Ground XTAL pin on CPU U1-39 (to U1-1 = GND)
- Use BOM for resistor values, not silkscreen
- Add 4.7K pullup to ABORT* line
Assembly Sheet
Rev 2
Rev 1
- Use BOM for resistor values, not silkscreen
- Interactive BOM
