Difference between revisions of "LB-6809-01"
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| Line 317: | Line 317: | ||
* Missing D0 on PLD pin 11 | * Missing D0 on PLD pin 11 | ||
** Add wire U1-31 to U2-11 (CPUD0) | ** Add wire U1-31 to U2-11 (CPUD0) | ||
| + | ** Fixed without a wire | ||
| + | *** Write to 0xE000 clears LED (data = don't care) | ||
| + | *** Write to 0xC000 sets LED (data = don't care) | ||
| + | ** Example code | ||
| + | <pre> | ||
| + | 10 POKE 57344,0 | ||
| + | 20 GOSUB 1000 | ||
| + | 30 POKE 49152,0 | ||
| + | 40 GOSUB 1000 | ||
| + | 50 GOTO 10 | ||
| + | 1000 FOR I=0 TO 1000:NEXT I | ||
| + | 1010 RETURN | ||
| + | </pre> | ||
=== Rev 3 PCB Changes === | === Rev 3 PCB Changes === | ||
Revision as of 13:13, 18 October 2024
Contents
- 1 Features
- 2 Design
- 3 Software
- 3.1 Build 6809 Assembly Code (Windows 64-bit)
- 3.2 Other Tools
- 3.3 Programming using TL866
- 3.4 ROM access test code (loop.asm)
- 3.5 LED Blink code (blink.asm)
- 3.6 SRAM Test (ramLoop.asm)
- 3.7 SRAM Test (ramTest1.asm)
- 3.8 SRAM Test (ramTest.asm)
- 3.9 ACIATest.asm
- 3.10 Microsoft Extended BASIC
- 3.11 ASSIST-09 Debugger
- 3.12 ASSIST-09 Plus Microsoft Extended BASIC
- 3.13 Reference Designs
- 4 Mechanicals
- 5 Checkout
- 6 Assembly Sheet
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)
- Could be mapped in the PLD to EPROM or SRAM (with LB-MEM-04 card)
- 0xA000-0xBFFF Serial (ACIA)
- Could be reduced to 4K range in the PLD freeing up 4 KB for SRAM or EPROM
- 0xC000-0xFFFF 16KB EPROM
Design
68B09 CPU
- 8 MHz clock using crystal and built-in oscillator
- 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 10/15/24; Revision 01; Designer DOUG G; Company LAND BOARDS LLC; Assembly LB680901_U2; Location Rustbelt, US; Device G16V8; /* */ /* Control inputs */ 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 18 = RDY; ROMCS = CPUA15 & CPUA14 & CPUREAD; /* 0xC000-0xFFFF */ RAMCS = !CPUA15 & CPUREAD /* 0x0000-0x7FFF 32KB SRAM */ # !CPUA15 & !CPUREAD & VPB; IOCS = CPUA15 & !CPUA14 & CPUA13 & CPUREAD /* 0xA000-0xBFFF Serial (ACIA) */ # CPUA15 & !CPUA14 & CPUA13 & !CPUREAD & VPB; RDY = VPB; MEMRD = CPUREAD; LED = CPUA15 & CPUA14 & !CPUREAD & VPB & D0 # LED & !(CPUA15 & CPUA14 & !CPUREAD & VPB);
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 Reference 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
Other Tools
- Motorola 6809 Emulator
- LWTOOLS Assembler
- [AS9 Assembler http://home.hccnet.nl/a.w.m.van.der.horst/m6809.html]
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 Rev 1 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
- Based on Grant Searle's 6-chip 6809 computer
- Microsoft Extended BASIC, as used in the Tandy Coco 2 (modified for the SBC with all I/O via serial)
- MBasROM.hex
- Hex file for 27C512
- First three 16KB sections are filled with 0xFF
- Hex file for 27C512
- 115,200 BAUD
- Same build as SIMPLE-6809 from Grant Searle
- Grant wrote a serial handler to control the text I/O, along with suitable Control-C break handling
- Includes commands from the "Extended" BASIC ROM (from the "Extended BASIC Unraveled II" book)
- The ROM in the SBC is fully working with all the commands in the Standard and Extended ROMS that are applicable to the SBC
- BASIC from DB00 TO FFFF, so a large amount of free space suitable for a monitor etc (6912 bytes free)
- Works
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
ASSIST-09 Debugger
- ASSIST-09 for the 6850 ACIA (source code)
- Debugger with small command set
- ASSIST-09 Commands
- Includes S record loader
- Altered source code to assemble using asm6809
- Period can't be first character on label (changed to X)
- Changed opcode CPX > CMPX
- assist09-6850.hex file
- Command line to assemble code
..\..\M6809_Assembler\asm6809-2.13-w64\asm6809 assist09-6850.asm -H -l assist09-6850.lst -o assist09-6850.hex
- Works
ASSIST09 >R PC-F842 A-00 B-00 X-20FE Y-F002 U-60C2 S-6051 CC-F4 DP-00 PC- >
ASSIST-09 Plus Microsoft Extended BASIC
- Jeff Tranter combined the ASSIST-09 and Ext BASIC source codes
- Assist_MBasic files on GitHub
- Debugger with small command set
- Adds U (Unassemble command)
- ASSIST-09 Commands
- Includes S record loader
- G C000 to run Extended BASIC
- Works
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 3 Checkout
- Missing D0 on PLD pin 11
- Add wire U1-31 to U2-11 (CPUD0)
- Fixed without a wire
- Write to 0xE000 clears LED (data = don't care)
- Write to 0xC000 sets LED (data = don't care)
- Example code
10 POKE 57344,0 20 GOSUB 1000 30 POKE 49152,0 40 GOSUB 1000 50 GOTO 10 1000 FOR I=0 TO 1000:NEXT I 1010 RETURN
Rev 3 PCB Changes
- Added LED to U2-15
- Silkscreen = STATUS
- Changed reset switch to right angle pushbutton switch
- Can be pressed easier in the backplane
- Added bulk electrolytic capacitor
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Rev 2 Checkout
- Board with sockets (machine pin)
- 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
- Replaced C2 cap with electrolytic bulk cap
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 3
Rev 2
Rev 1
- Use BOM for resistor values, not silkscreen
- Interactive BOM
