diff --git a/count-license.txt b/count-license.txt
new file mode 100644
index 0000000..3cf713e
--- /dev/null
+++ b/count-license.txt
@@ -0,0 +1,59 @@
+count - Copyright (c) 2002, TundraWare Inc., All Rights Reserved
+
+This license refers to the following files found in the 'count.zip'
+archive.
+
+count.asm
+COUNT.COD
+COUNT.ERR
+COUNT.HEX
+COUNT.LST
+COUNT.XRF
+Makefile
+
+Hereafter, these files are referred to collectively as the "Count Files".
+
+**********
+* PLEASE NOTE: The files found in the TAIT-Test subdirectory of this
+* archive are from David Tait. THEY ARE NOT PART OF THE COUNT FILES
+* AND ARE NOT A SUBJECT OF THIS LICENSE AGREEMENT. The files in the
+* TAIT-Test subdirectory remain the property of Mr. Tait who has
+* given permission for their distribution.
+**********
+
+Permission to use and distribute the Count Files is hereby granted so
+long as ALL the following conditions are met:
+
+ 1) The user of the Count Files understands and agrees that this is
+ experimental software which is provided "AS-IS" with no
+ warranties expressed or implied by TundraWare Inc.
+
+ 2) The user acknowledges the Count Files has NOT been tested for:
+ a) Correct operation
+ b) Freedom from unintended consequences
+ c) Any operation or condition which might cause damage to
+ the user's machine, software, network, or data, or which
+ might cause any breach of system security of the user's
+ system(s) or any other systems.
+
+ 3) By using the Count Files, the user does so at their own risk and
+ agrees to hold TundraWare Inc. harmless for any damage,
+ direct or indirect, that this software may or does cause to
+ the user's computational environment, including, but not
+ limited to, the user's hardware, software, network, or data.
+ The user further agrees to hold TundraWare Inc. harmless for
+ any economic damage or any other adverse consequence, direct
+ or indirect, caused by the use of the Count Files.
+
+ 4) If duplicated and/or distributed, no fee beyond reasonable
+ duplication charges may be charged for the Count Files.
+
+ 5) Any distributed copies of the Count Files must include all the
+ originally provided software, documentation, and licensing
+ information.
+
+If you do not understand, or cannot abide by any of these conditions,
+DO NOT USE the Count Files.
+
+To report bugs or suggest improvements, contact: tundra@tundraware.com
+
diff --git a/count.asm b/count.asm
new file mode 100644
index 0000000..090c5bd
--- /dev/null
+++ b/count.asm
@@ -0,0 +1,127 @@
+; COUNT.ASM
+; Copyright (c) 2002, TundraWare Inc.
+;
+; Loosely based on David Tait's LED 'WALK.ASM' Test Program
+; Uses same hardware setup but counts in binary, flashing at
+; full count.
+
+;;; Generally speaking, UPPER-CASE symbols in the code below are
+;;; defined in the standard MPLAB include file. My code is in
+;;; lower-case.
+
+
+ list p=16F84A
+ #include <P16F84A.INC>
+
+ errorlevel -302 ;suppress bank selection messages
+ __config 3ff5h ;xt osc, watchdog
+ __idlocs 1234
+
+;;; Device Constants
+
+
+pre1 equ 08h ; prescaler constants
+pre2 equ 09h
+pre4 equ 0ah
+pre8 equ 0bh
+pre16 equ 0ch
+pre32 equ 0dh
+pre64 equ 0eh
+pre128 equ 0fh
+
+
+;;; Program Constants
+
+blinkcnt equ 05h ; number of times to blink
+bcount equ 0dh ; register to hold blink count
+maxcnt equ 0fh ; maximum count to display
+preblink equ pre32 ; prescaler value for blinking
+precount equ pre16 ; prescaler value for counting
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;;;
+; Main program logic
+;;;
+
+begin call portb_w ; setup PORTB for writing
+ movlw precount ; set prescaler for slow disply
+ call wdt_pre
+ movlw maxcnt ; number of counts
+ clrf PORTB ; all leds off
+count sleep ; display current count for a while
+ incf PORTB,F ; next value to display
+ movf PORTB,W ; see if we're displaying 'maxcnt'
+ andlw 0fh ; mask hi nibble - no LEDs there
+ xorlw maxcnt ; subtract 'maxcnt' from w
+ btfss STATUS,Z
+ goto count ; nope, continue counting
+ call blink
+ goto begin
+
+;;; End of main logic
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;;;
+; Supporting Subroutines
+;;;
+
+;;;
+; Set PORTB To Write
+; Returns with Bank 0 selected
+;;;
+
+portb_w bsf STATUS,RP0 ; select register bank 1
+ clrf TRISB ; set PORTB to all outputs
+ bcf STATUS,RP0 ; select register bank 0
+ return
+
+;;; End of 'portb_w'
+
+
+;;;
+; Set the WDT Prescaler
+; Value required must be passed in w
+; Returns with Bank 0 selected
+;;;
+
+wdt_pre bsf STATUS,RP0 ; select register bank 1
+ movwf OPTION_REG
+ bcf STATUS,RP0 ; bank0 so PORTB is addressable
+ return
+
+;;; End of 'wdt_pre'
+
+
+;;;
+; Blink The Lights
+;;;
+
+blink movlw preblink ; set prescaler for fast blink
+ call wdt_pre
+ movlw blinkcnt ; number of times to blink
+ movwf bcount
+bcycle sleep ; display on from caller
+ clrf PORTB ; display off
+ sleep
+ decfsz bcount,F ; if zero, we've done 'blinkcnt' repetitions
+ goto again ; we're not done yet
+ return ; all done
+again movlw maxcnt ; blink again - display on
+ movwf PORTB
+ goto bcycle
+
+;;; End of 'blink'
+
+
+
+;;;
+; EEPROM Contents
+;;;
+
+ org 2100h
+;
+ DE "$Id: count.asm,v 1.9 2002/03/10 15:43:56 tundra Exp tundra $"
+ END
+
diff --git a/count.cod b/count.cod
new file mode 100644
index 0000000..46efc19
--- /dev/null
+++ b/count.cod
Binary files differ
diff --git a/count.err b/count.err
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/count.err
diff --git a/count.hex b/count.hex
new file mode 100644
index 0000000..6be3fa0
--- /dev/null
+++ b/count.hex
@@ -0,0 +1,17 @@
+:020000040000FA
+:100000000E200C3012200F3086016300860A06088D
+:100010000F390F3A031D0528162000288316860184
+:100020008312080083168100831208000D3012200D
+:1000300005308D006300860163008D0B20280800C9
+:060040000F3086001A28B3
+:084000000100020003000400AE
+:02400E00F53F7C
+:104200002400490064003A00200063006F0075003C
+:104210006E0074002E00610073006D002C007600AB
+:10422000200031002E003900200032003000300024
+:1042300032002F00300033002F003100300020000A
+:10424000310035003A00340033003A0035003600C2
+:104250002000740075006E00640072006100200090
+:104260004500780070002000740075006E00640046
+:0842700072006100200024002F
+:00000001FF
diff --git a/count.lst b/count.lst
new file mode 100644
index 0000000..9ccd17b
--- /dev/null
+++ b/count.lst
@@ -0,0 +1,273 @@
+MPASM 03.00 Released COUNT.ASM 3-10-2002 16:22:35 PAGE 1
+
+
+LOC OBJECT CODE LINE SOURCE TEXT
+ VALUE
+
+ 00001 ; COUNT.ASM
+ 00002 ; Copyright (c) 2002, TundraWare Inc.
+ 00003 ;
+ 00004 ; Loosely based on David Tait's LED 'WALK.ASM' Test Program
+ 00005 ; Uses same hardware setup but counts in binary, flashing at
+ 00006 ; full count.
+ 00007
+ 00008 ;;; Generally speaking, UPPER-CASE symbols in the code below are
+ 00009 ;;; defined in the standard MPLAB include file. My code is in
+ 00010 ;;; lower-case.
+ 00011
+ 00012
+ 00013 list p=16F84A
+ 00014 #include <P16F84A.INC>
+ 00001 LIST
+ 00002 ; P16F84A.INC Standard Header File, Version 2.00 Microchip Technology, Inc.
+ 00134 LIST
+ 00015
+ 00016 errorlevel -302 ;suppress bank selection messages
+2007 3FF5 00017 __config 3ff5h ;xt osc, watchdog
+2000 0001 0002 0003 00018 __idlocs 1234
+ 0004
+ 00019
+ 00020 ;;; Device Constants
+ 00021
+ 00022
+ 00000008 00023 pre1 equ 08h ; prescaler constants
+ 00000009 00024 pre2 equ 09h
+ 0000000A 00025 pre4 equ 0ah
+ 0000000B 00026 pre8 equ 0bh
+ 0000000C 00027 pre16 equ 0ch
+ 0000000D 00028 pre32 equ 0dh
+ 0000000E 00029 pre64 equ 0eh
+ 0000000F 00030 pre128 equ 0fh
+ 00031
+ 00032
+ 00033 ;;; Program Constants
+ 00034
+ 00000005 00035 blinkcnt equ 05h ; number of times to blink
+ 0000000D 00036 bcount equ 0dh ; register to hold blink count
+ 0000000F 00037 maxcnt equ 0fh ; maximum count to display
+ 0000000D 00038 preblink equ pre32 ; prescaler value for blinking
+ 0000000C 00039 precount equ pre16 ; prescaler value for counting
+ 00040
+ 00041 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+ 00042
+ 00043 ;;;
+ 00044 ; Main program logic
+ 00045 ;;;
+ 00046
+0000 200E 00047 begin call portb_w ; setup PORTB for writing
+0001 300C 00048 movlw precount ; set prescaler for slow disply
+0002 2012 00049 call wdt_pre
+ MPASM 03.00 Released COUNT.ASM 3-10-2002 16:22:35 PAGE 2
+
+
+LOC OBJECT CODE LINE SOURCE TEXT
+ VALUE
+
+0003 300F 00050 movlw maxcnt ; number of counts
+0004 0186 00051 clrf PORTB ; all leds off
+0005 0063 00052 count sleep ; display current count for a while
+0006 0A86 00053 incf PORTB,F ; next value to display
+0007 0806 00054 movf PORTB,W ; see if we're displaying 'maxcnt'
+0008 390F 00055 andlw 0fh ; mask hi nibble - no LEDs there
+0009 3A0F 00056 xorlw maxcnt ; subtract 'maxcnt' from w
+000A 1D03 00057 btfss STATUS,Z
+000B 2805 00058 goto count ; nope, continue counting
+000C 2016 00059 call blink
+000D 2800 00060 goto begin
+ 00061
+ 00062 ;;; End of main logic
+ 00063
+ 00064 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+ 00065
+ 00066 ;;;
+ 00067 ; Supporting Subroutines
+ 00068 ;;;
+ 00069
+ 00070 ;;;
+ 00071 ; Set PORTB To Write
+ 00072 ; Returns with Bank 0 selected
+ 00073 ;;;
+ 00074
+000E 1683 00075 portb_w bsf STATUS,RP0 ; select register bank 1
+000F 0186 00076 clrf TRISB ; set PORTB to all outputs
+0010 1283 00077 bcf STATUS,RP0 ; select register bank 0
+0011 0008 00078 return
+ 00079
+ 00080 ;;; End of 'portb_w'
+ 00081
+ 00082
+ 00083 ;;;
+ 00084 ; Set the WDT Prescaler
+ 00085 ; Value required must be passed in w
+ 00086 ; Returns with Bank 0 selected
+ 00087 ;;;
+ 00088
+0012 1683 00089 wdt_pre bsf STATUS,RP0 ; select register bank 1
+0013 0081 00090 movwf OPTION_REG
+0014 1283 00091 bcf STATUS,RP0 ; bank0 so PORTB is addressable
+0015 0008 00092 return
+ 00093
+ 00094 ;;; End of 'wdt_pre'
+ 00095
+ 00096
+ 00097 ;;;
+ 00098 ; Blink The Lights
+ 00099 ;;;
+ 00100
+0016 300D 00101 blink movlw preblink ; set prescaler for fast blink
+0017 2012 00102 call wdt_pre
+ MPASM 03.00 Released COUNT.ASM 3-10-2002 16:22:35 PAGE 3
+
+
+LOC OBJECT CODE LINE SOURCE TEXT
+ VALUE
+
+0018 3005 00103 movlw blinkcnt ; number of times to blink
+0019 008D 00104 movwf bcount
+001A 0063 00105 bcycle sleep ; display on from caller
+001B 0186 00106 clrf PORTB ; display off
+001C 0063 00107 sleep
+001D 0B8D 00108 decfsz bcount,F ; if zero, we've done 'blinkcnt' repetitions
+001E 2820 00109 goto again ; we're not done yet
+001F 0008 00110 return ; all done
+0020 300F 00111 again movlw maxcnt ; blink again - display on
+0021 0086 00112 movwf PORTB
+0022 281A 00113 goto bcycle
+ 00114
+ 00115 ;;; End of 'blink'
+ 00116
+ 00117
+ 00118
+ 00119 ;;;
+ 00120 ; EEPROM Contents
+ 00121 ;;;
+ 00122
+2100 00123 org 2100h
+ 00124 ;
+2100 0024 0049 0064 00125 DE "$Id: count.asm,v 1.9 2002/03/10 15:43:56 tundra Exp tundra $"
+ 003A 0020 0063
+ 006F 0075 006E
+ 0074 002E 0061
+ 0073 006D 002C
+ 0076 0020 0031
+ 002E 0039 0020
+ 0032 0030 0030
+ 0032 002F 0030
+ 0033 002F 0031
+ 0030 0020 0031
+ 0035 003A 0034
+ 0033 003A 0035
+ 0036 0020 0074
+ 0075 006E 0064
+ 0072 0061 0020
+ 0045 007
+ 00126 END
+ MPASM 03.00 Released COUNT.ASM 3-10-2002 16:22:35 PAGE 4
+
+
+SYMBOL TABLE
+ LABEL VALUE
+
+C 00000000
+DC 00000001
+EEADR 00000009
+EECON1 00000088
+EECON2 00000089
+EEDATA 00000008
+EEIE 00000006
+EEIF 00000004
+F 00000001
+FSR 00000004
+GIE 00000007
+INDF 00000000
+INTCON 0000000B
+INTE 00000004
+INTEDG 00000006
+INTF 00000001
+IRP 00000007
+NOT_PD 00000003
+NOT_RBPU 00000007
+NOT_TO 00000004
+OPTION_REG 00000081
+PCL 00000002
+PCLATH 0000000A
+PORTA 00000005
+PORTB 00000006
+PS0 00000000
+PS1 00000001
+PS2 00000002
+PSA 00000003
+RBIE 00000003
+RBIF 00000000
+RD 00000000
+RP0 00000005
+RP1 00000006
+STATUS 00000003
+T0CS 00000005
+T0IE 00000005
+T0IF 00000002
+T0SE 00000004
+TMR0 00000001
+TRISA 00000085
+TRISB 00000086
+W 00000000
+WR 00000001
+WREN 00000002
+WRERR 00000003
+Z 00000002
+_CP_OFF 00003FFF
+_CP_ON 0000000F
+_HS_OSC 00003FFE
+_LP_OSC 00003FFC
+_PWRTE_OFF 00003FFF
+_PWRTE_ON 00003FF7
+ MPASM 03.00 Released COUNT.ASM 3-10-2002 16:22:35 PAGE 5
+
+
+SYMBOL TABLE
+ LABEL VALUE
+
+_RC_OSC 00003FFF
+_WDT_OFF 00003FFB
+_WDT_ON 00003FFF
+_XT_OSC 00003FFD
+__16F84A 00000001
+again 00000020
+bcount 0000000D
+bcycle 0000001A
+begin 00000000
+blink 00000016
+blinkcnt 00000005
+count 00000005
+maxcnt 0000000F
+portb_w 0000000E
+pre1 00000008
+pre128 0000000F
+pre16 0000000C
+pre2 00000009
+pre32 0000000D
+pre4 0000000A
+pre64 0000000E
+pre8 0000000B
+preblink 0000000D
+precount 0000000C
+wdt_pre 00000012
+
+
+MEMORY USAGE MAP ('X' = Used, '-' = Unused)
+
+0000 : XXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXX XXX------------- ----------------
+2000 : XXXX---X-------- ---------------- ---------------- ----------------
+2100 : XXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXX XXXXXXXXXXXX----
+
+All other memory blocks unused.
+
+Program Memory Words Used: 35
+Program Memory Words Free: 989
+
+
+Errors : 0
+Warnings : 0 reported, 0 suppressed
+Messages : 0 reported, 2 suppressed
+
+
\ No newline at end of file
diff --git a/count.xrf b/count.xrf
new file mode 100644
index 0000000..df4a850
--- /dev/null
+++ b/count.xrf
@@ -0,0 +1,111 @@
+MPASM 03.00 Released COUNT.ASM 3-10-2002 16:22:35 PAGE 1
+
+ MPASM Cross Reference File
+
+LABEL TYPE FILE NAME SOURCE FILE REFERENCES
+----- ---- --------- ----------------------
+
+C C P16F84A.INC 76*
+DC C P16F84A.INC 75*
+EEADR C P16F84A.INC 57*
+EECON1 C P16F84A.INC 64*
+EECON2 C P16F84A.INC 65*
+EEDATA C P16F84A.INC 56*
+EEIE C P16F84A.INC 81*
+EEIF C P16F84A.INC 102*
+F C P16F84A.INC 45*
+FSR C P16F84A.INC 53*
+GIE C P16F84A.INC 80*
+INDF C P16F84A.INC 49*
+INTCON C P16F84A.INC 59*
+INTE C P16F84A.INC 83*
+INTEDG C P16F84A.INC 92*
+INTF C P16F84A.INC 86*
+IRP C P16F84A.INC 69*
+NOT_PD C P16F84A.INC 73*
+NOT_RBPU C P16F84A.INC 91*
+NOT_TO C P16F84A.INC 72*
+OPTION_REG C COUNT.ASM 90.
+ P16F84A.INC 61*
+PCL C P16F84A.INC 51*
+PCLATH C P16F84A.INC 58*
+PORTA C P16F84A.INC 54*
+PORTB C COUNT.ASM 51. 53. 54. 106. 112.
+ P16F84A.INC 55*
+PS0 C P16F84A.INC 98*
+PS1 C P16F84A.INC 97*
+PS2 C P16F84A.INC 96*
+PSA C P16F84A.INC 95*
+RBIE C P16F84A.INC 84*
+RBIF C P16F84A.INC 87*
+RD C P16F84A.INC 106*
+RP0 C COUNT.ASM 75. 77. 89. 91.
+ P16F84A.INC 71*
+RP1 C P16F84A.INC 70*
+STATUS C COUNT.ASM 57. 75. 77. 89. 91.
+ P16F84A.INC 52*
+T0CS C P16F84A.INC 93*
+T0IE C P16F84A.INC 82*
+T0IF C P16F84A.INC 85*
+T0SE C P16F84A.INC 94*
+TMR0 C P16F84A.INC 50*
+TRISA C P16F84A.INC 62*
+TRISB C COUNT.ASM 76.
+ P16F84A.INC 63*
+W C P16F84A.INC 44*
+WR C P16F84A.INC 105*
+WREN C P16F84A.INC 104*
+WRERR C P16F84A.INC 103*
+Z C COUNT.ASM 57.
+ MPASM 03.00 Released COUNT.ASM 3-10-2002 16:22:35 PAGE 2
+
+ MPASM Cross Reference File
+
+LABEL TYPE FILE NAME SOURCE FILE REFERENCES
+----- ---- --------- ----------------------
+
+ P16F84A.INC 74*
+_CP_OFF C P16F84A.INC 124*
+_CP_ON C P16F84A.INC 123*
+_HS_OSC C P16F84A.INC 131*
+_LP_OSC C P16F84A.INC 129*
+_PWRTE_OFF C P16F84A.INC 126*
+_PWRTE_ON C P16F84A.INC 125*
+_RC_OSC C P16F84A.INC 132*
+_WDT_OFF C P16F84A.INC 128*
+_WDT_ON C P16F84A.INC 127*
+_XT_OSC C P16F84A.INC 130*
+__16F84A V COUNT.ASM 13*
+ P16F84A.INC 34.
+again A COUNT.ASM 109. 111*
+bcount C COUNT.ASM 36* 104. 108.
+bcycle A COUNT.ASM 105* 113.
+begin A COUNT.ASM 47* 60.
+blink A COUNT.ASM 59. 101*
+blinkcnt C COUNT.ASM 35* 103.
+count A COUNT.ASM 52* 58.
+maxcnt C COUNT.ASM 37* 50. 56. 111.
+portb_w A COUNT.ASM 47. 75*
+pre1 C COUNT.ASM 23*
+pre128 C COUNT.ASM 30*
+pre16 C COUNT.ASM 27* 39.
+pre2 C COUNT.ASM 24*
+pre32 C COUNT.ASM 28* 38.
+pre4 C COUNT.ASM 25*
+pre64 C COUNT.ASM 29*
+pre8 C COUNT.ASM 26*
+preblink C COUNT.ASM 38* 101.
+precount C COUNT.ASM 39* 48.
+wdt_pre A COUNT.ASM 49. 89* 102.
+
+
+LABEL TYPES
+-----------
+A Address
+C Constant
+E External
+M Macro
+S Segment
+U Unknown
+V Variable
+X Other
diff --git a/makefile b/makefile
new file mode 100644
index 0000000..f150c1d
--- /dev/null
+++ b/makefile
@@ -0,0 +1,8 @@
+# Makefile for PIC count.asm demo
+# $Id: Makefile,v 1.2 2002/03/08 16:32:39 tundra Exp tundra $
+
+all:
+ @c:/progra~1/mplab/mpasm /x /q count.asm
+clean:
+ @rm -f *.cod *.err *.hex *.lst *.obj *.xrf
+
diff --git a/readme.txt b/readme.txt
new file mode 100644
index 0000000..b739cfd
--- /dev/null
+++ b/readme.txt
@@ -0,0 +1,31 @@
+'count.zip' contains some simple test code to help learn how
+to program and burn a PIC 16F84(A) microcontroller.
+
+David Tait, the 'father' of the cheap PIC programmer, previously
+distributed an example schematic and simple test program for shaking
+out the coding/assembly/burn cycle for these devices. (These can be
+found in the 'TAIT-test' subdirectory of this zip archive.) His
+program, 'walk.asm', repeatedly cycles through a set of 4 LEDs.
+
+I've written a slightly more complicated test program for this same
+hardware, 'count.asm', which counts in binary from 0 to an upper bound
+you select (in the 'maxctn' constant) up to 0fh and then blinks
+several ('blinkcnt') times. I wanted to illustrate a couple of ideas
+that PIC newcomers might find useful to see:
+
+- Use of the MPLAB standard device include file.
+- Symbolic definition of program parameters ('blinkcnt' and 'maxcnt').
+- Dynamic reprogramming of the prescaler.
+- Use of subroutines to localize repeatedly used code.
+- Use of logical operators for masking and subtraction.
+- Implicit and explicit testing of Zero flag.
+- Embedding RCS version information in EEPROM.
+
+One important note: My code is setup for a crystal oscillator rather
+than an RC network as found in the original circuit. I found that the
+capacitance of the prototyping board I was using dominated the very
+small capacitance needed for the RC oscillator - the circuit ran with
+*no* capacitor. This gave me some concerns as regards to oscillator
+stability, so I switched to a crystal. If you are using an RC
+oscillator as David Tait's original circuit suggests, simply change
+__CONFIG to 3ff7H and reassemble 'count.asm'.
diff --git a/tait-test/test.pcx b/tait-test/test.pcx
new file mode 100644
index 0000000..eb30113
--- /dev/null
+++ b/tait-test/test.pcx
Binary files differ
diff --git a/tait-test/walk.asm b/tait-test/walk.asm
new file mode 100644
index 0000000..3398a10
--- /dev/null
+++ b/tait-test/walk.asm
@@ -0,0 +1,48 @@
+; WALK.ASM
+;
+; To use this program connect four LEDs from each of RB0-RB3 to ground
+; via four 470 ohm resistors. The LEDs are illuminated one at time in
+; a to-and-fro pattern.
+;
+; The illumination rate is more or less independent of the PIC clock
+; frequency and configuration although this program assumes an RC
+; oscillator. The program includes the __CONFIG, __IDLOCS and DE
+; directives (mostly just to show how they can be used). The program
+; can be used unchanged on any 16X8X device.
+
+ LIST P=16C84
+ ERRORLEVEL -302 ;SUPPRESS BANK SELECTION MESSAGES
+ __CONFIG 3FF7H ;RC OSC, WATCHDOG
+ __IDLOCS 1234
+;
+PORTB EQU 6
+TRISB EQU 86H
+OPTREG EQU 81H
+STATUS EQU 3
+CARRY EQU 0
+RP0 EQU 5
+MSB EQU 3 ;BIT POSITION OF LEFTMOST LED
+;
+ CLRF PORTB ;ALL LEDS OFF
+ BSF STATUS,RP0 ;SELECT REGISTER BANK 1
+ CLRF TRISB ;SET PORTB TO ALL OUTPUTS
+ MOVLW 0AH
+ MOVWF OPTREG ;ASSIGN PRESCALER (1:4) TO WDT
+ BCF STATUS,RP0 ;SELECT REGISTER BANK 0
+ INCF PORTB,F ;TURN ON RIGHTMOST LED
+ BCF STATUS,CARRY ;CLEAR CARRY
+LEFT SLEEP ;WAIT FOR WDT TIMEOUT
+ RLF PORTB,F ;TURN ON LED TO LEFT
+ BTFSS PORTB,MSB ;REACHED LEFTMOST?
+ GOTO LEFT ;LOOP IF NOT
+RIGHT SLEEP ;WAIT FOR WDT TIMEOUT
+ RRF PORTB,F ;TURN ON LED TO RIGHT
+ BTFSS PORTB,0 ;REACHED RIGHTMOST?
+ GOTO RIGHT ;LOOP IF NOT
+ GOTO LEFT ;START NEW CYCLE
+;
+ ORG 2100H
+;
+ DE "Copyright (C) 1996 David Tait"
+ END
+
diff --git a/tait-test/walk.hex b/tait-test/walk.hex
new file mode 100644
index 0000000..4681fdc
--- /dev/null
+++ b/tait-test/walk.hex
@@ -0,0 +1,10 @@
+:100000008601831686010A3081008312860A031056
+:100010006300860D861D08286300860C061C0C28CC
+:020020000828AE
+:084000000100020003000400AE
+:02400E00F73F7A
+:1042000043006F0070007900720069006700680069
+:1042100074002000280043002900200031003900EC
+:104220003900360020004400610076006900640017
+:0A42300020005400610069007400D2
+:00000001FF