Difference between revisions of "LB-65CXX-01"

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Line 1: Line 1:
−
[[file:LB-65C816-01_FRONT_REV1(BLK).png]]
+
[[file:LB-65CXX-01_P1090724-720px.jpg]]
  
 
== Features ==
 
== Features ==
  
 
* 65C02 or 65C816 CPU
 
* 65C02 or 65C816 CPU
−
* 2 MHz Oscillator on card
+
* 2 MHz (typical) Oscillator on card
 
* Reset switch/power monitor
 
* Reset switch/power monitor
 
* Address decoder PLD drives RAM/ROM/IO chip selects
 
* Address decoder PLD drives RAM/ROM/IO chip selects
Line 10: Line 10:
  
 
== Design ==
 
== Design ==
 +
 +
=== Memory Map ===
 +
 +
<pre>
 +
0x0000-0x7FFF - 32KB SRAM
 +
0x8000-0x8FFF - 4KB I/O space
 +
0x9000-0xBFFF - Free space (12 KB SRAM Using 128KB SRAM)
 +
0xC000-0xFFFF - 16KB EPROM space
 +
</pre>
  
 
=== CPU ===
 
=== CPU ===
Line 16: Line 25:
  
 
* 65C02 or 65C816 CPU
 
* 65C02 or 65C816 CPU
 +
** 65C816 requires mods to the PCB (see Checkout notes below) or Rev 2 PCB
 
* 2 MHz
 
* 2 MHz
 
* Install jumper J2:1-2 if CPU is not a WDC 65C02 or WDC 65C816
 
* Install jumper J2:1-2 if CPU is not a WDC 65C02 or WDC 65C816
  
−
==== R65C02 vs W65C02 CPUs ====
+
==== R65C02 vs W65C02 vs W65C816 CPUs ====
 +
 
 +
{| class="wikitable"
 +
! U1 Pin
 +
! U1 Pin Name
 +
! Sig Name
 +
! Pullup
 +
! R65C02 sig
 +
! W65C02 sig
 +
! W65C816 sig
 +
|-
 +
| 1
 +
| VSS/VPB
 +
| J2 selects
 +
| N
 +
| VSS (IN)
 +
| VPB (OUT)
 +
| VPB (OUT)
 +
|-
 +
| 3
 +
| PH1OUT/ABORT
 +
| ABORT*
 +
| REV2
 +
| PH1OUT (OUT)
 +
| PH1OUT (OUT)
 +
| ABORT (IN)
 +
|-
 +
| 5
 +
| NC/MLB
 +
| MLB
 +
| N
 +
| NC
 +
| MLB (OUT)
 +
| MLB (OUT)
 +
|-
 +
| 7
 +
| SYNC/VPA
 +
| VPA
 +
| N
 +
| SYNC (OUT)
 +
| SYNC (OUT)
 +
| VPA (OUT)
 +
|-
 +
| 35
 +
| NC/E
 +
| CPUE
 +
| N
 +
| NC
 +
| NC
 +
| EM/NAT (OUT)
 +
|-
 +
| 36
 +
| NC/BE
 +
| IORQ*
 +
| REV2
 +
| NC
 +
| BE (IN)
 +
| BE (IN)
 +
|-
 +
| 37
 +
| PH0IN/PH2IN
 +
| CPUCLK
 +
| N
 +
| PH0IN
 +
| PH2IN
 +
| PH2IN
 +
|-
 +
| 38
 +
| SO/MX
 +
| CPUMX
 +
| REV1/2
 +
| SO* (IN)
 +
| SOB (IN)
 +
| MX (OUT)
 +
|-
 +
| 39
 +
| PH2OUT/VDA
 +
| VDA
 +
| N
 +
| PH2OUT (OUT)
 +
| PH2OUT (OUT)
 +
| VDA (OUT)
 +
|-
 +
|}
 +
 
 +
[[file:R65C02_vs_W65C02_w65c816_Pinout_800PX.png]]
 +
 
 +
===== VDA/VPA (65C816) =====
 +
 
 +
* VDA/VDA
 +
** 00, Internal operation (invalid address bus)
 +
** 01, Valid Program Address
 +
** 10, Valid Data Address
 +
** 11, Opcode-fetch
 +
 
 +
=== Chip Set ===
 +
 
 +
* [https://www.ebay.com/itm/114007713791 Ordered from Ebay]
 +
 
 +
[[file:LB_65C02_PARTS.jpg]]
  
−
[[file:R65C02_vs_W65C02Pinout.png]]
+
* Picture shows 3 MHz CPU
 +
* Received 2 MHz CPU
 +
* As received:
  
−
* R65C02 vs W65C02 pin differences
+
[[file:SIMPLE-6502_P1090155-720px.jpg]]
−
** Pin 1
 
−
*** R65C02 = VSS J2:1-2
 
−
*** W65C02 = VPB J2:2-3 - Vector Pull
 
−
** Pin 5
 
−
*** R65C02 = NC
 
−
*** W65C02 = MLB - Memory Lock
 
−
** Pin 36
 
−
*** R65C02 = NC
 
−
*** W65C02 = BE - Bus Enable
 
  
 
=== Oscillator ===
 
=== Oscillator ===
Line 39: Line 141:
  
 
=== PLD ===
 
=== PLD ===
 +
 +
* ATF16V8B part
 +
* [[TL866ii Plus Programmer]]
  
 
[[file:LB-65CXX-01_PLS.PNG]]
 
[[file:LB-65CXX-01_PLS.PNG]]
  
 
=== PLD Listing ===
 
=== PLD Listing ===
 +
 +
* [https://github.com/land-boards/lb-boards/blob/master/RetroCPUs/LB-RETRO-SET/LB-65CXX-01/LOGIC/LB-65CXX-01_PLD.PLD PLD File]
  
 
<pre>
 
<pre>
 
Name      LB-65CXX-01_PLD;
 
Name      LB-65CXX-01_PLD;
 
Partno    ATF16V8B;
 
Partno    ATF16V8B;
−
Date      09/09/20;
+
Date      09/12/24;
 
Revision  01;
 
Revision  01;
 
Designer  DOUG G;
 
Designer  DOUG G;
 
Company    LAND BOARDS LLC;
 
Company    LAND BOARDS LLC;
−
Assembly  U00;
+
Assembly  LB65CXX01_U2;
 
Location  Rustbelt, US;
 
Location  Rustbelt, US;
 
Device    G16V8;
 
Device    G16V8;
  
 
/*
 
/*
−
65C816 Control
+
65C02 Control
 
*/
 
*/
−
 
  
 
/* Control inputs */
 
/* Control inputs */
Line 68: Line 174:
 
PIN    6  = CPUREAD;
 
PIN    6  = CPUREAD;
 
PIN    8  = VPA;
 
PIN    8  = VPA;
−
PIN    9  = VDA;
+
PIN    9  = VDA; /* Pin 39, PH2OUT - Enable line */
  
−
/* Counter data inputs */
+
/* Address Decode and Chip Select outputs */
 
PIN    13  = !IOCS;
 
PIN    13  = !IOCS;
 
PIN    14  = !ROMCS;
 
PIN    14  = !ROMCS;
Line 77: Line 183:
 
PIN    18  = RDY;
 
PIN    18  = RDY;
  
−
ROMCS = CPUA15 & CPUA14 & CPUA13 & CPUA12 & CPUREAD & VDA
+
RAMCS = !CPUA15 & CPUREAD /* 0x0000-0x7FFF */
−
#      CPUA15 & CPUA14 & CPUA13 & CPUA12 & CPUREAD & VPA;
+
#      !CPUA15 & !CPUREAD & VDA;
  
−
RAMCS = !CPUA15 & VDA
+
IOCS = CPUA15 & !CPUA14 & CPUA13 & !CPUA12 & CPUREAD /* 0x8000-0x8FFF */
−
#       !CPUA15 & VPA;
+
#     CPUA15 & !CPUA14 & CPUA13 & !CPUA12 & !CPUREAD & VDA;
  
−
IOCS = CPUA15 & !CPUA14 & !CPUA13 & !CPUA12 & VDA;
+
ROMCS = CPUA15 & CPUA14 & CPUREAD; /* 0xC000-0xFFFF (16KB space) */
  
−
MEMRD = CPUREAD & CLK;
+
RDY = VDA;
−
 
 
−
/*
 
−
RDY = VPA
 
−
#    VDA;
 
−
*/
 
  
 +
MEMRD = CPUREAD;
 
</pre>
 
</pre>
  
Line 106: Line 208:
  
 
[[file:LB-65CXX-01_BKPL.PNG]]
 
[[file:LB-65CXX-01_BKPL.PNG]]
 +
 +
== Software ==
 +
 +
* [https://github.com/douggilliland/Retro-Computers/tree/master/6502/LB-6502 LB-6502 GitHub]
 +
* [[SIMPLE-6502#Software|SIMPLE-6502 Software]] - Reference software
 +
 +
=== Assembly Language Development Toolchain ===
 +
 +
* [https://cc65.github.io/ cc65 Assembler, Linker, Compiler]
 +
** [https://github.com/douggilliland/Retro-Computers/tree/master/6502/LB-6502 Backup copy]
 +
* [https://github.com/douggilliland/Retro-Computers/blob/master/6502/LB-6502/AciaTest/AciaTest.bat Example batch file] to assemble code and produce .hex file
 +
 +
<pre>
 +
ca65 AciaTest.s -o AciaTest.o -l
 +
ld65 -C AciaTest.cfg AciaTest.o -o AciaTest.bin
 +
srec_cat.exe AciaTest.bin -binary -o AciaTest.hex -Intel
 +
</pre>
 +
 +
* [https://github.com/douggilliland/Retro-Computers/blob/master/6502/LB-6502/AciaTest/AciaTest.cfg AciaTest.cfg]
 +
 +
<pre>
 +
MEMORY {
 +
ROM: start = $C000, size = $3FFA, fill = yes, fillval=$FF, file = %O;
 +
VECTS: start = $FFFA, size = $6, fill = yes, fillval=$FF, file = %O;
 +
}
 +
 +
SEGMENTS {
 +
CODE: load = ROM, type = ro;
 +
VECTS: load = VECTS, type = ro;
 +
}
 +
</pre>
 +
 +
=== ACIA Test Code ===
 +
 +
* [https://github.com/douggilliland/Retro-Computers/blob/master/6502/LB-6502/AciaTest/AciaTest.s ACIATest.s]
 +
* Loopback serial data
 +
* Works
 +
 +
=== Simple Monitor 6502 ===
 +
 +
* [https://raw.githubusercontent.com/douggilliland/Retro-Computers/master/6502/LB-6502/SimpleMon6502/SimpleMon6502.s SimpleMon6502.s] - GitHub repo
 +
* Contains
 +
** ACIA init, read, write
 +
** Simplest commands mostly for function development
 +
** String functions
 +
*** Read a string
 +
*** Write a string (macro)
 +
*** Write hex value as a string
 +
* Dump page (256-bytes) of memory
 +
 +
=== 6502 Enhanced BASIC ===
 +
 +
* [https://github.com/douggilliland/Retro-Computers/tree/master/6502/LB-6502/EnhBASIC-6502 Enhanced BASIC Source Code on GitHub]
 +
* Free space using [[LB-MEM-02]] card
 +
 +
<pre>
 +
?FRE(0)
 +
31999
 +
</pre>
 +
 +
==== Enhanced BASIC Bug Fixes ====
 +
 +
* [https://raw.githubusercontent.com/douggilliland/Retro-Computers/master/6502/LB-6502/EnhBASIC-6502/bugsnquirks.txt Enhanced BASIC Quirks and fixes]
 +
** Fixes the IRQ_vec missing error when assembling the code
 +
 +
<pre>
 +
; Ibuffs can now be anywhere in RAM, ensure that the max length is < $80,
 +
; the input buffer must not cross a page boundary and must not overlap with
 +
; program RAM pages!
 +
 +
;Ibuffs          = IRQ_vec+$14
 +
Ibuffs            = VEC_SV+$16
 +
                    ; start of input buffer after IRQ/NMI code
 +
Ibuffe            = Ibuffs+$47; end of input buffer
 +
</pre>
 +
 +
* Added some of the patches from [https://raw.githubusercontent.com/douggilliland/Retro-Computers/master/6502/LB-6502/EnhBASIC-6502/bugsnquirks.txt Enhanced BASIC Quirks and fixes]
 +
** [https://github.com/douggilliland/Retro-Computers/tree/master/6502/LB-6502/EnhBASIC-6502/Patched Patched code is here]
 +
 +
* Boots to request memory size
 +
 +
[[FILE:EnhBASIC_BOOT.PNG]]
 +
 +
* Runs on card
 +
 +
[[FILE:EnhBASIC_LOOP.PNG]]
 +
 +
=== OSI BASIC ===
 +
 +
* [https://github.com/douggilliland/Retro-Computers/tree/master/6502/LB-6502 LB-6502 GitHub]
 +
** Generated from [https://github.com/mist64/msbasic msbasic Source Code]
 +
* Grant Searle's 6502 design
 +
** [http://searle.x10host.com/6502/osi_bas.zip Link to Grant's files]
 +
** [https://github.com/douggilliland/Retro-Computers/tree/master/6502/LB-6502/OSI_BAS Local copy]
 +
* Source code
 +
** [https://github.com/douggilliland/Retro-Computers/blob/master/6502/LB-6502/OSI_BAS/osi_bas.s osi_bas.s] <== the Microsoft OSI BASIC and I/O routines SOURCE all in a single file
 +
** Grant's I/O routines are at the end of it
 +
* Files to allow the source to be assembled on a Windows based machine
 +
** assemble.bat <== double click to assemble osi_bas.s and link to binary file "osi_bas.bin"
 +
** This should be exactly 16K
 +
** [https://github.com/douggilliland/Retro-Computers/blob/master/6502/LB-6502/OSI_BAS/osi_bas.cfg osi_bas.cfg] <== configuration file for the linker (ensure ORG and entries in this file match if you change any)
 +
** ca65.exe <== the assembler from the cc65 package. Use this. The new version on the cc65 site crashes!
 +
** ld65.exe <== linker from the cc65 package
 +
** srec_cat.exe <== Converts bin file to .hex file
 +
* Output files
 +
** osi_bas.bin <== the ROM fine in pure binary
 +
** osi_bas.lst <== Assembly listing file
 +
** rom.hex <== the ROM fine in standard INTEL-HEX format
 +
* To allow simple re-assembly, extract all files to the same folder
 +
** Use srec_cat utility to convert the "bin" file to HEX or s19 (etc)
 +
* All source code, assembler binaries and the HEX dump of the ROM is [http://searle.x10host.com/6502/osi_bas.zip here]
 +
** It is in standard INTEL-HEX format for uploading to a suitable programmer.
 +
* Having trouble running code
 +
 +
==== Hacking MBASIC ====
 +
 +
* [https://www.pagetable.com/?p=46 Create your own Version of Microsoft BASIC for 6502]
 +
 +
<video type="youtube">gOwi2p1pzVM</video>
 +
 +
=== VLT-2 for 6502 ===
 +
 +
* [http://forum.6502.org/viewtopic.php?p=41243#p41243 VTL02 (VTL-2 for the 6502) by Mike Barry] - on the 6502.org site
 +
* [https://github.com/Klaus2m5/VTL02 Klaus's repo]
 +
* [https://github.com/douggilliland/Retro-Computers/tree/master/6502/VTL-2 VTL-2 GitHub]
 +
* [http://forum.6502.org/viewtopic.php?p=41243#p41243 Thread about improvements to VLT-2]
 +
* [https://github.com/douggilliland/Retro-Computers/blob/master/6502/VTL-2/Altair_680-VTL-2%20Manual-05-Beta_1-Searchable.pdf VTL-2 Manual]
 +
 +
=== Programming References ===
 +
 +
==== 6502 Instruction Set ====
 +
 +
* [http://www.6502.org/users/obelisk/6502/instructions.html#:~:text=The%20Instruction%20Set.%20The%206502%20has%20a%20relatively%20basic%20set#:~:text=The%20Instruction%20Set.%20The%206502%20has%20a%20relatively%20basic%20set The 6502 Instruction Set]
 +
* [https://retrogamecoders.com/6502-processor/ 6502 Programmer’s Reference]
 +
* [https://6502-toolchain.readthedocs.io/en/latest/isa_reference/index.html 65(c)02 Instruction Set Reference]
 +
* [https://c64os.com/post/6502instructions#:~:text=6502%20/%206510%20Instruction%20Set%20Every%20Commodore%2064%20programmer%20should 6502 / 6510 Instruction Set]
 +
 +
=== Additional Tools ===
 +
 +
* [https://kh-labs.org/6502/ 6502 Emulator] - Simple emulator but it works
 +
* [https://www.masswerk.at/6502/index.html virtual 6502 / Emulator]
 +
* [http://www.6502.org/tools/asm/ 6502.org Tools for the 6502]
 +
** [https://6502-toolchain.readthedocs.io/en/latest/isa_reference/index.html Cross development package for 65(C)02 systems, including a powerful macro assembler, a C compiler, linker, librarian and several other tools]
 +
 +
== Mechanicals ==
 +
 +
[[file:LB-665CXX-01_REV2_MECHS.PNG]]
 +
 +
== Checkout ==
 +
 +
=== Rev 3 ===
 +
 +
==== PCB Updates ====
 +
 +
* Add bulk electrolytic cap
 +
* Make PH2OUT on VPB backplane line (swap wth VDA)
 +
* Change to vertical reset switch
 +
* Add an LED that is written by writing D0 to ROM area
 +
 +
=== Rev 2 ===
 +
 +
==== Rev 2 Checkout ====
 +
 +
* Install jumper J2:1-2 since CPU is R65C02
 +
* [http://land-boards.com/blwiki/index.php?title=LB-BKOUT-01#NOP_Tester NOP tester] - 6502 nop = 0xEA
 +
** Works
 +
* Add LED
 +
** 1.8K resistor from U2-17 to Ground
 +
** Wire U2-11 to U1-33 CPUD0
 +
 +
[[file:LB-65CXX-01_P1090727-720px.jpg]]
 +
 +
* Cut etch U1-39 in rear (removes PH2OUT from backplane)
 +
 +
[[file:LB-6502_VPA_Rework.PNG]]
 +
 +
* Add wire U1-39 to J2-3 (PH2OUT/VPB on VPB output)
 +
 +
[[file:LB-6502_VPB_Rework.PNG]]
 +
 +
==== Rev 2 Changes ====
 +
 +
* Add pull-up resistor on ABORT* line (U1-3)
 +
* Add pull-up resistor on BE line (U1-36)
 +
 +
[[file:LB-65CXX-01_CPU_Rev2.PNG]]
 +
 +
=== Rev 1 ===
 +
 +
* Install jumper J2:1-2 if CPU is not a WDC 65C02 or WDC 65C816
 +
* If WDC 65C02 or WDC 65C816 is used:
 +
** Add pull-up resistor on ABORT* line (U1-3)
 +
** Add pull-up resistor on BE line (U1-36)
 +
 +
== Assembly Sheet ==
 +
 +
=== Rev 2 ===
 +
 +
* [https://land-boards.com/LB-65CXX-01/LB-65CXX-01_Rev2_ibom.html Interactive BOM]
 +
 +
=== Rev 1 ===
 +
 +
* [https://land-boards.com/LB-65CXX-01/LB-65CXX-01_Rev1_ibom.html Interactive BOM]

Latest revision as of 09:11, 7 October 2024

LB-65CXX-01 P1090724-720px.jpg

Features

  • 65C02 or 65C816 CPU
  • 2 MHz (typical) Oscillator on card
  • Reset switch/power monitor
  • Address decoder PLD drives RAM/ROM/IO chip selects
  • 100x50mm card

Design

Memory Map

0x0000-0x7FFF - 32KB SRAM
0x8000-0x8FFF - 4KB I/O space
0x9000-0xBFFF - Free space (12 KB SRAM Using 128KB SRAM)
0xC000-0xFFFF - 16KB EPROM space

CPU

LB-65CXX-01 CPU.PNG

  • 65C02 or 65C816 CPU
    • 65C816 requires mods to the PCB (see Checkout notes below) or Rev 2 PCB
  • 2 MHz
  • Install jumper J2:1-2 if CPU is not a WDC 65C02 or WDC 65C816

R65C02 vs W65C02 vs W65C816 CPUs

U1 Pin U1 Pin Name Sig Name Pullup R65C02 sig W65C02 sig W65C816 sig
1 VSS/VPB J2 selects N VSS (IN) VPB (OUT) VPB (OUT)
3 PH1OUT/ABORT ABORT* REV2 PH1OUT (OUT) PH1OUT (OUT) ABORT (IN)
5 NC/MLB MLB N NC MLB (OUT) MLB (OUT)
7 SYNC/VPA VPA N SYNC (OUT) SYNC (OUT) VPA (OUT)
35 NC/E CPUE N NC NC EM/NAT (OUT)
36 NC/BE IORQ* REV2 NC BE (IN) BE (IN)
37 PH0IN/PH2IN CPUCLK N PH0IN PH2IN PH2IN
38 SO/MX CPUMX REV1/2 SO* (IN) SOB (IN) MX (OUT)
39 PH2OUT/VDA VDA N PH2OUT (OUT) PH2OUT (OUT) VDA (OUT)

R65C02 vs W65C02 w65c816 Pinout 800PX.png

VDA/VPA (65C816)
  • VDA/VDA
    • 00, Internal operation (invalid address bus)
    • 01, Valid Program Address
    • 10, Valid Data Address
    • 11, Opcode-fetch

Chip Set

LB 65C02 PARTS.jpg

  • Picture shows 3 MHz CPU
  • Received 2 MHz CPU
  • As received:

SIMPLE-6502 P1090155-720px.jpg

Oscillator

LB-65CXX-01 OSC.PNG

PLD

LB-65CXX-01 PLS.PNG

PLD Listing

Name       LB-65CXX-01_PLD;
Partno     ATF16V8B;
Date       09/12/24;
Revision   01;
Designer   DOUG G;
Company    LAND BOARDS LLC;
Assembly   LB65CXX01_U2;
Location   Rustbelt, US;
Device     G16V8;

/*
	65C02 Control
*/

/* Control inputs */
PIN    1   = CLK;
PIN    2   = CPUA12;
PIN    3   = CPUA13;
PIN    4   = CPUA14;
PIN    5   = CPUA15;
PIN    6   = CPUREAD;
PIN    8   = VPA;
PIN    9   = VDA;		/* Pin 39, PH2OUT - Enable line */

/* Address Decode and Chip Select outputs */
PIN    13  = !IOCS;
PIN    14  = !ROMCS;
PIN    15  = !MEMRD;
PIN    16  = !RAMCS;
PIN    18  = RDY;

RAMCS = !CPUA15 & CPUREAD		/* 0x0000-0x7FFF */
#       !CPUA15 & !CPUREAD & VDA;

IOCS = CPUA15 & !CPUA14 & CPUA13 & !CPUA12 & CPUREAD	/* 0x8000-0x8FFF */
#      CPUA15 & !CPUA14 & CPUA13 & !CPUA12 & !CPUREAD & VDA;

ROMCS = CPUA15 & CPUA14 & CPUREAD;	/* 0xC000-0xFFFF (16KB space)		*/

RDY = VDA;

MEMRD = CPUREAD;

Reset Controller

LB-65CXX-01 RES.PNG

Backplane connector

LB-65CXX-01 BKPL.PNG

Software

Assembly Language Development Toolchain

ca65 AciaTest.s -o AciaTest.o -l
ld65 -C AciaTest.cfg AciaTest.o -o AciaTest.bin
srec_cat.exe AciaTest.bin -binary -o AciaTest.hex -Intel

MEMORY {
	ROM:		start = $C000, size = $3FFA, fill = yes, fillval=$FF, file = %O;
	VECTS:		start = $FFFA, size = $6, fill = yes, fillval=$FF, file = %O;
}

SEGMENTS {
	CODE:		load = ROM,	type = ro;
	VECTS:		load = VECTS,	type = ro;
}

ACIA Test Code

Simple Monitor 6502

  • SimpleMon6502.s - GitHub repo
  • Contains
    • ACIA init, read, write
    • Simplest commands mostly for function development
    • String functions
      • Read a string
      • Write a string (macro)
      • Write hex value as a string
  • Dump page (256-bytes) of memory

6502 Enhanced BASIC

?FRE(0)
 31999

Enhanced BASIC Bug Fixes

; Ibuffs can now be anywhere in RAM, ensure that the max length is < $80,
; the input buffer must not cross a page boundary and must not overlap with
; program RAM pages!

;Ibuffs           = IRQ_vec+$14
Ibuffs            = VEC_SV+$16
                    ; start of input buffer after IRQ/NMI code
Ibuffe            = Ibuffs+$47; end of input buffer
  • Boots to request memory size

EnhBASIC BOOT.PNG

  • Runs on card

EnhBASIC LOOP.PNG

OSI BASIC

  • LB-6502 GitHub
  • Grant Searle's 6502 design
  • Source code
    • osi_bas.s <== the Microsoft OSI BASIC and I/O routines SOURCE all in a single file
    • Grant's I/O routines are at the end of it
  • Files to allow the source to be assembled on a Windows based machine
    • assemble.bat <== double click to assemble osi_bas.s and link to binary file "osi_bas.bin"
    • This should be exactly 16K
    • osi_bas.cfg <== configuration file for the linker (ensure ORG and entries in this file match if you change any)
    • ca65.exe <== the assembler from the cc65 package. Use this. The new version on the cc65 site crashes!
    • ld65.exe <== linker from the cc65 package
    • srec_cat.exe <== Converts bin file to .hex file
  • Output files
    • osi_bas.bin <== the ROM fine in pure binary
    • osi_bas.lst <== Assembly listing file
    • rom.hex <== the ROM fine in standard INTEL-HEX format
  • To allow simple re-assembly, extract all files to the same folder
    • Use srec_cat utility to convert the "bin" file to HEX or s19 (etc)
  • All source code, assembler binaries and the HEX dump of the ROM is here
    • It is in standard INTEL-HEX format for uploading to a suitable programmer.
  • Having trouble running code

Hacking MBASIC

VLT-2 for 6502

Programming References

6502 Instruction Set

Additional Tools

Mechanicals

LB-665CXX-01 REV2 MECHS.PNG

Checkout

Rev 3

PCB Updates

  • Add bulk electrolytic cap
  • Make PH2OUT on VPB backplane line (swap wth VDA)
  • Change to vertical reset switch
  • Add an LED that is written by writing D0 to ROM area

Rev 2

Rev 2 Checkout

  • Install jumper J2:1-2 since CPU is R65C02
  • NOP tester - 6502 nop = 0xEA
    • Works
  • Add LED
    • 1.8K resistor from U2-17 to Ground
    • Wire U2-11 to U1-33 CPUD0

LB-65CXX-01 P1090727-720px.jpg

  • Cut etch U1-39 in rear (removes PH2OUT from backplane)

LB-6502 VPA Rework.PNG

  • Add wire U1-39 to J2-3 (PH2OUT/VPB on VPB output)

LB-6502 VPB Rework.PNG

Rev 2 Changes

  • Add pull-up resistor on ABORT* line (U1-3)
  • Add pull-up resistor on BE line (U1-36)

LB-65CXX-01 CPU Rev2.PNG

Rev 1

  • Install jumper J2:1-2 if CPU is not a WDC 65C02 or WDC 65C816
  • If WDC 65C02 or WDC 65C816 is used:
    • Add pull-up resistor on ABORT* line (U1-3)
    • Add pull-up resistor on BE line (U1-36)

Assembly Sheet

Rev 2

Rev 1

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