Difference between revisions of "LB-6802-01"

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* [https://archive.org/details/How_to_Program_and_Interface_the_6800_By_Andrew_C_Staugaard_1980/page/260/mode/2up How to Program and Interface the 6800 By Andrew C. Staugaard, Jr. 1980]
 
* [https://archive.org/details/How_to_Program_and_Interface_the_6800_By_Andrew_C_Staugaard_1980/page/260/mode/2up How to Program and Interface the 6800 By Andrew C. Staugaard, Jr. 1980]
 
* [http://www.8bit-era.cz/6800.html#addr8-desc 6800 instruction set]
 
* [http://www.8bit-era.cz/6800.html#addr8-desc 6800 instruction set]
 +
 +
* [http://www.retrotechnology.com/restore/smithbug.html SMITHBUG] is a debugger similar to MIKBUG
 +
** Examine/Edit memory
 +
** Disassembly code
 +
** Download S record (V2)
 +
** Run code
 +
* FIG-Forth - Forth language
 +
* Combined SMITHBUG and FIG-Forth build
 +
 +
=== SmithBUG Builds for SIMPLE-MC6802 CPU Card ===
 +
 +
* Pre-built software
 +
** [https://github.com/land-boards/lb-boards/tree/master/RetroCPUs/SIMPLE-6802/SOFTWARE/SMITHBUG/SMITHBUG_4K SMITHBUG 4KB build]
 +
** [https://github.com/land-boards/lb-boards/tree/master/RetroCPUs/SIMPLE-6802/SOFTWARE/SMITHBUG/SMITHBUG_8K SMITHBUG 8KB build]
 +
** [https://github.com/land-boards/lb-boards/tree/master/RetroCPUs/SIMPLE-6802/SOFTWARE/SMITHBUG SMITHBUG 16KB build]
 +
 +
==== 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 ====
 +
 +
<pre>
 +
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
 +
</pre>
 +
 +
==== 8KB Build ====
 +
 +
<pre>
 +
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
 +
</pre>
 +
 +
==== 16KB Build ====
 +
 +
* Used with 27SF256 parts
 +
** 2nd half of EPROM unused
 +
 +
<pre>
 +
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
 +
</pre>
 +
 +
==== SmithBUG Commands ====
 +
 +
<pre>
 +
; V VIEW MEMORY
 +
; E CHANGE MEMORY
 +
; I FILL MEMORY
 +
; M MOVE MEMORY
 +
; D DISASSEMBLE CODE
 +
; G GO TO PROGRAM
 +
; R PRINT
 +
; @ ASCII CONVERSION
 +
; H PRINTER ON
 +
; J JUMP TO TARGET PROGRAM
 +
; F FIND
 +
; Q HARDWARE LOCATION
 +
; T TRACE PROGRAM
 +
; 1 BREAKPOINT ONE
 +
; 2 BREAKPOINT TWO
 +
; K CONTINUE AFTER BREAK
 +
; & S1 LOAD PROGRAM
 +
; * HARDWARE LOCATION (TBA)
 +
; O ECHO ON
 +
; N ECHO OFF
 +
</pre>
 +
 +
=== FIGFORTH in RAM ===
 +
 +
* [https://www.corshamtech.com/tech-tips/fig-forth-for-6800/ Corsham Tech FIG-Forth 68 page]
 +
* [https://github.com/douggilliland/Retro-Computers/tree/master/6800/fig-FORTH/figForth_SmithBUG FIGFORTH GitHub]
 +
** Enter command to srecord loader
 +
<pre>
 +
&
 +
</pre>
 +
* Using TermTerm, File, Send File
 +
* Send [https://github.com/douggilliland/Retro-Computers/blob/master/6800/fig-FORTH/figForth_SmithBUG/fig-FORTH_6800.s19 fig-FORTH_6800.s19]
 +
* Type S9 to exit srecord loader
 +
* Type J 1000 to jump to address 0x1000
 +
* Responds with
 +
 +
<pre>
 +
Forth-68
 +
1 1 + . 2  OK
 +
</pre>
 +
 +
* [https://github.com/douggilliland/Retro-Computers/tree/master/6800/fig-FORTH#readme FIG-Forth-68 Commands]
 +
** Type VLIST to get list og built-ins
 +
 +
<pre>
 +
TASK  FORTH  NOOP  VLIST  TRIAD  INDEX  LIST  ?  .  D.  D.R  .R  #S  #  SIGN  #>  <#
 +
SPACES  WHILE  ELSE  IF  REPEAT  AGAIN  END  UNTIL  +LOOP  LOOP  DO  THEN  ENDIF  BEGIN
 +
BACK  FORGET  '  R/W  HI  LO  BLOCK_READ  BLOCK_WRITE  ?DISC  -->  LOAD  MESSAGE  .LINE
 +
(LINE)  BLOCK  BUFFER  DR1  DR0  EMPTY-BUFFERS  UPDATE  +BUF  PREV  USE  DABS  ABS  M/MOD
 +
*/  */MOD  MOD  /  /MOD  *  S->D  COLD  ABORT  QUIT  (  DEFINITIONS  VOCABULARY  IMMEDIATE
 +
INTERPRET  DLITERAL  LITERAL  [COMPILE]  CREATE  ID.  ERROR  (ABORT)  -FIND  NUMBER  (NUMBER)
 +
WORD  PAD  HOLD  BLANKS  ERASE  FILL      QUERY  EXPECT  ?STACK  ."  (.")  -TRAILING  TYPE
 +
COUNT  DOES>  <BUILDS  ;CODE  (:CODE)  DECIMAL  HEX  SMUDGE  ]  [  COMPILE  ?LOADING  ?CSP
 +
?PAIRS  ?EXEC  ?COMP  ?ERROR  !CSP  PFA  NFA  CFA  LFA  LATEST  TRAVERSE  -DUP  MAX  MIN
 +
SPACE  ROT  >  <  =  -  C,  ,  ALLOT  HERE  2+  1+  COLUMNS  HLD  R#  CSP  FLD  DPL
 +
BASE  STATE  CURRENT  CONTEXT  OFFSET  SCR  OUT  IN  BLK  VOC-LINK  DP  FENCE  WARNING
 +
WIDTH  TIB  R0  S0  +ORIGIN  B/SCR  B/BUF  LIMIT  FIRST  BL  3  2  1  0  USER  VARIABLE
 +
CONSTANT  ;  :  C!  !  C@  @  TOGGLE  +!  DUP  SWAP  DROP  OVER  DMINUS  MINUS  D+  +
 +
0<  0=  R  R>  >R  LEAVE  ;S  RP!  SP!  SP@  XOR  OR  AND  U/  U*  CMOVE  CR  ?TERMINAL
 +
KEY  EMIT  ENCLOSE  (FIND)  DIGIT  I  (DO)  (+LOOP)  (LOOP)  0BRANCH  BRANCH  EXECUTE  LIT    OK
 +
</pre>
 +
 +
=== SMITHBUG and FIGFORTH in ROM ===
 +
 +
* Combines SMITHBUG and FIGFORTH in ROM
 +
** [https://github.com/land-boards/lb-boards/blob/master/RetroCPUs/SIMPLE-6802/SOFTWARE/SMITHBUG_FORTH/SMITHBUG_FORTH_SIMPLE-FC.hex Hex file]
 +
* [https://github.com/land-boards/lb-boards/blob/master/RetroCPUs/SIMPLE-6802/SOFTWARE/SMITHBUG_FORTH/SMITHBUG_FORTH_SIMPLE-6802_C000.ASM Combined Source code]
 +
** SMITHBUG in ROM from 0xC000-0xCFFF
 +
** FIGFORTH in ROM from 0xD000-0xEFFF
 +
** Vectors are at top of ROM from 0xFFF8-0xFFFF
 +
* Fixes in FIG-Forth to get it to run from ROM
 +
** The comments in the file indicated it could be run from ROM but the stack pointed to ORIG which is in ROM
 +
** Fixed addresses of stack and I/O pointer to get it to work from ROM
 +
* [https://github.com/land-boards/lb-boards/tree/master/RetroCPUs/SIMPLE-6802/SOFTWARE/SMITHBUG_FORTH SMITHBUG and FIGFORTH in ROM GitHub]
 +
* Assemble
 +
<PRE>
 +
A68 SMITHBUG_FORTH_SIMPLE-6802_C000.ASM -l SMITHBUG_FORTH_SIMPLE-6802_C000.LST -s SMITHBUG_FORTH_SIMPLE-6802_C000.S
 +
6800/6801 Cross-Assembler (Portable) Ver 3.5!
 +
Copyright (c) 1985 William C. Colley, III
 +
fixes for LCC/Windows and improvement by HRJ Aug 26 2019
 +
A68 source_file | -l list_file | | -o/-s object_file |
 +
 +
No Errors
 +
</PRE>
 +
 +
* Edit out RAM at top
 +
* Make hex file
 +
 +
<PRE>
 +
srec_cat SMITHBUG_FORTH_SIMPLE-6802_C000.s -offset - -minimum-addr SMITHBUG_FORTH_SIMPLE-6802_C000.s -o SMITHBUG_FORTH_SIMPLE-FC.hex -Intel
 +
srec_cat: SMITHBUG_FORTH_SIMPLE-6802_C000.s: 1: warning: no header record
 +
srec_cat: SMITHBUG_FORTH_SIMPLE-6802_C000.s: 1: warning: no header record
 +
</PRE>
 +
 +
* Boots to SMITHBUG
 +
* Type J D000 to run Fig-Forth '''or'''
 +
* Type 4 to run Forth
 +
 +
=== TinyBASIC ===
 +
 +
* [https://github.com/land-boards/lb-boards/tree/master/RetroCPUs/SIMPLE-6802/SOFTWARE/TinyBASIC TinyBASIC GitHub]
 +
* [https://github.com/douggilliland/Retro-Computers/blob/master/6800/TinyBASIC/Pittman-TinyBASIC/README.mediawiki TINY BASIC User Manual]
 +
** [https://github.com/douggilliland/Retro-Computers/blob/master/6800/TinyBASIC/Pittman-TinyBASIC/TINY%20BASIC%20User%20Manual.pdf TINY BASIC User Manual PDF]
 +
* Load using &
 +
** Character/line delays 1 mSec
 +
* Send [https://github.com/land-boards/lb-boards/blob/master/RetroCPUs/SIMPLE-6802/SOFTWARE/TinyBASIC/TB_6800.s TB_6800.s file]
 +
* Run using J 0100
  
 
== Mechanicals ==
 
== Mechanicals ==

Revision as of 18:10, 11 September 2024

LB-6802-01 P1670-720PX.jpg

Features

  • 68B02 CPU
    • 1.8432 MHz clock
    • MC6802 is fully compatible with MC6800 but without messy two-phase clocking

Memory Map

  • 0x0000-0x7FFF 32KB SRAM
  • 0x8000-0xBFFF Serial (68B50 ACIA)
  • 0xC000-0xFFFF 16KB EPROM

Design

CPU

LB-6802-01 CPU.PNG

MC6800 Block Diagram

Mc6800 processor diagram.png

Bus Timing

Timing 68B02.PNG

Power Supervisor/Reset

LB-6802-01 RESET PWR SUPER.PNG

PLD

LB-6802-01 PLD.PNG

PLD Listing

Name       LB-6802-01_PLD;
Partno     ATF16V8B;
Date       08/24/24;
Revision   01;
Designer   DOUG G;
Company    LAND BOARDS LLC;
Assembly   LB680201_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;

/* Address Decode and Chip Select outputs */
PIN    12  = !ROMCS;
PIN    13  = !IOCS;
PIN    14  = !MEMRD;
PIN    16  = !RAMCS;
PIN    18  = RDY;

ROMCS = CPUA15 & CPUA14 & VPB;

RAMCS = !CPUA15 & VPB						/* 0x0000-0x7FFF 32KB SRAM */
#        CPUA15 & !CPUA14 & !CPUA13 & VPB;	/* 0x8000-0x9FFF Free (8KB	*/

IOCS = CPUA15 & !CPUA14 & CPUA13 & VPB;		/* 0xA000-0xBFFF Serial (ACIA)	*/

RDY = VPB;

MEMRD = CPUREAD & VPB;

Backplane Connector

LB-6802-01 BKPL.PNG

Software

  • SMITHBUG is a debugger similar to MIKBUG
    • Examine/Edit memory
    • Disassembly code
    • Download S record (V2)
    • Run code
  • FIG-Forth - Forth language
  • Combined SMITHBUG and FIG-Forth build

SmithBUG Builds for SIMPLE-MC6802 CPU Card

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

  • Used with 27SF256 parts
    • 2nd half of EPROM unused
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

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

FIGFORTH in RAM

&
  • Using TermTerm, File, Send File
  • Send fig-FORTH_6800.s19
  • Type S9 to exit srecord loader
  • Type J 1000 to jump to address 0x1000
  • Responds with
Forth-68
1 1 + . 2  OK

TASK   FORTH   NOOP   VLIST   TRIAD   INDEX   LIST   ?   .   D.   D.R   .R   #S   #   SIGN   #>   <#
SPACES   WHILE   ELSE   IF   REPEAT   AGAIN   END   UNTIL   +LOOP   LOOP   DO   THEN   ENDIF   BEGIN
BACK   FORGET   '   R/W   HI   LO   BLOCK_READ   BLOCK_WRITE   ?DISC   -->   LOAD   MESSAGE   .LINE
(LINE)   BLOCK   BUFFER   DR1   DR0   EMPTY-BUFFERS   UPDATE   +BUF   PREV   USE   DABS   ABS   M/MOD
*/   */MOD   MOD   /   /MOD   *   S->D   COLD   ABORT   QUIT   (   DEFINITIONS   VOCABULARY   IMMEDIATE
INTERPRET   DLITERAL   LITERAL   [COMPILE]   CREATE   ID.   ERROR   (ABORT)   -FIND   NUMBER   (NUMBER)
WORD   PAD   HOLD   BLANKS   ERASE   FILL      QUERY   EXPECT   ?STACK   ."   (.")   -TRAILING   TYPE
COUNT   DOES>   <BUILDS   ;CODE   (:CODE)   DECIMAL   HEX   SMUDGE   ]   [   COMPILE   ?LOADING   ?CSP
?PAIRS   ?EXEC   ?COMP   ?ERROR   !CSP   PFA   NFA   CFA   LFA   LATEST   TRAVERSE   -DUP   MAX   MIN
SPACE   ROT   >   <   =   -   C,   ,   ALLOT   HERE   2+   1+   COLUMNS   HLD   R#   CSP   FLD   DPL
BASE   STATE   CURRENT   CONTEXT   OFFSET   SCR   OUT   IN   BLK   VOC-LINK   DP   FENCE   WARNING
WIDTH   TIB   R0   S0   +ORIGIN   B/SCR   B/BUF   LIMIT   FIRST   BL   3   2   1   0   USER   VARIABLE
CONSTANT   ;   :   C!   !   C@   @   TOGGLE   +!   DUP   SWAP   DROP   OVER   DMINUS   MINUS   D+   +
0<   0=   R   R>   >R   LEAVE   ;S   RP!   SP!   SP@   XOR   OR   AND   U/   U*   CMOVE   CR   ?TERMINAL
KEY   EMIT   ENCLOSE   (FIND)   DIGIT   I   (DO)   (+LOOP)   (LOOP)   0BRANCH   BRANCH   EXECUTE   LIT    OK

SMITHBUG and FIGFORTH in ROM

  • Combines SMITHBUG and FIGFORTH in ROM
  • Combined Source code
    • SMITHBUG in ROM from 0xC000-0xCFFF
    • FIGFORTH in ROM from 0xD000-0xEFFF
    • Vectors are at top of ROM from 0xFFF8-0xFFFF
  • Fixes in FIG-Forth to get it to run from ROM
    • The comments in the file indicated it could be run from ROM but the stack pointed to ORIG which is in ROM
    • Fixed addresses of stack and I/O pointer to get it to work from ROM
  • SMITHBUG and FIGFORTH in ROM GitHub
  • Assemble
A68 SMITHBUG_FORTH_SIMPLE-6802_C000.ASM -l SMITHBUG_FORTH_SIMPLE-6802_C000.LST -s SMITHBUG_FORTH_SIMPLE-6802_C000.S
6800/6801 Cross-Assembler (Portable) Ver 3.5!
Copyright (c) 1985 William C. Colley, III
fixes for LCC/Windows and improvement by HRJ Aug 26 2019
A68 source_file | -l list_file | | -o/-s object_file |

No Errors
  • Edit out RAM at top
  • Make hex file
srec_cat SMITHBUG_FORTH_SIMPLE-6802_C000.s -offset - -minimum-addr SMITHBUG_FORTH_SIMPLE-6802_C000.s -o SMITHBUG_FORTH_SIMPLE-FC.hex -Intel
srec_cat: SMITHBUG_FORTH_SIMPLE-6802_C000.s: 1: warning: no header record
srec_cat: SMITHBUG_FORTH_SIMPLE-6802_C000.s: 1: warning: no header record
  • Boots to SMITHBUG
  • Type J D000 to run Fig-Forth or
  • Type 4 to run Forth

TinyBASIC

Mechanicals

LB-6802-01 CAD Rev1.PNG

Checkout

Rev 1

  • Power supply noise trips voltage monitor
    • Change C2 capacitor to 100 uF
  • [LB-BKOUT-01#NOP_Tester|NOP Tester] worked

Assembly Sheet

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