diff --git a/Source/Apps/Survey/survey.mac b/Source/Apps/Survey/survey.mac
index b341e485..e26a9f77 100644
--- a/Source/Apps/Survey/survey.mac
+++ b/Source/Apps/Survey/survey.mac
@@ -607,9 +607,20 @@ PDLY:
 	JNZ	PDLY
 ;
 	.Z80
-	; RECORD THE ACTIVE BANK
-	LD	A,(0FFE0H)		; GET CURRENT HBIOS BANK ID
-	LD	(BANK),A		; AND SAVE IT
+	; record the active bank
+	ld	a,(0ffe0h)		; get current hbios bank id
+	ld	(BANK),a		; and save it
+	; Check for Z180 CPU
+	xor	a			; assume Z80
+	ld	(IS180),a		; save it
+	ld	de,0506H		; 5 x 6
+	db	0EDH,05CH		; MLT DE: de = 30 if z180
+	ld	a,e			; result to A
+	cp	30			; check if multiply happened
+	jr	nz,z80			; if invalid, then Z80
+	or	0ffH			; flag value for Z180
+	ld	(IS180),a		; save it
+z80:
 	.8080
 ;
 	LXI	H,0			; Init active port counter
@@ -623,28 +634,57 @@ PORTLP:
 	JZ	ISPORT			; Print mask port
 	ENDIF
 ;
-	mov	c,a			; port number to reg c
-	mvi	b,0			; for 16 bit  port addressing
 	.Z80
+	di				; interrupts off
+	ld	a,(IS180)		; Z180?
+	or	a
+	jr	nz,rd180
+;
+	; Z80 port read
+	ld	a,d
+	ld	c,a
+	ld	(pnum),a		; dynamic update
 	in	a,(c)
-	.8080
+	push	af
+	ld	b,0
+	in	a,(0FFH)
+pnum	equ	$-1
+	push	af
+	jr	rdz
 ;
-	.Z80
-	; MAKE SURE CORRECT BANK IS STILL SELECTED!
+rd180:
+	; Z180 port read
+	ld	a,d
+	ld	c,a
+	ld	(pnum1),a		; dynamic update
+	in	a,(c)
+	push	af
+	ld	b,0
+	db	0EDH,038H,0FFH		; IN0
+pnum1	equ	$-1
+	push	af
+;
+rdz:
+	; Make sure correct bank is still selected!
 	push	af
 	ld	a,(BANK)
 	call	0FFF3H
 	pop	af
-	.8080
 ;
-; inactive port could return 0xFF or 0x78 or the port address
+	ei				; interrupts back on now
 ;
-	cmp	c
-	jz	nextpt
-	cpi	0FFh
-	jz	nextpt
-	cpi	078h
-	jz	nextpt
+; port is considered inactive if values read from different port
+; read mechanisms differ or if the value $FF is read consistently
+;
+	pop	af
+	ld	c,a
+	pop	af
+	cp	c
+	jr	nz,NEXTPT
+	cp	0FFH
+	jr	z,NEXTPT
+;
+	.8080
 ISPORT:
 	mov	a,d			; got a live one, probably
 	ani	0f0h			; is port in same group as last ?
@@ -760,6 +800,7 @@ EMPF:	DS	1			; Empty so far flag
 BLKSHF:	DS	1			; block shift factor
 MAXALL:	DS	2			; maximum block number
 BANK:	DS	1			; saved HBIOS bank id
+IS180:	DS	1			; non-zero for Z180 CPU
 FINIS	EQU	$			; End of program
 ;
 	.DEPHASE
diff --git a/Source/Apps/Test/Build.cmd b/Source/Apps/Test/Build.cmd
index cc5679b0..dea44672 100644
--- a/Source/Apps/Test/Build.cmd
+++ b/Source/Apps/Test/Build.cmd
@@ -23,6 +23,7 @@ pushd ps2info && call Build || exit /b & popd
 pushd 2piotst && call Build || exit /b & popd
 pushd piomon && call Build || exit /b & popd
 pushd banktest && call Build || exit /b & popd
+pushd portswp && call Build || exit /b & popd
 
 goto :eof
 
diff --git a/Source/Apps/Test/Clean.cmd b/Source/Apps/Test/Clean.cmd
index 540d8888..f611848e 100644
--- a/Source/Apps/Test/Clean.cmd
+++ b/Source/Apps/Test/Clean.cmd
@@ -20,3 +20,4 @@ pushd ps2info && call Clean || exit /b 1 & popd
 pushd 2piotst && call Clean || exit /b 1 & popd
 pushd piomon && call Clean || exit /b 1 & popd
 pushd banktest && call Clean || exit /b 1 & popd
+pushd portswp && call Clean || exit /b 1 & popd
diff --git a/Source/Apps/Test/Makefile b/Source/Apps/Test/Makefile
index 7f511966..e1f78754 100644
--- a/Source/Apps/Test/Makefile
+++ b/Source/Apps/Test/Makefile
@@ -1,5 +1,5 @@
 OBJECTS = 
-SUBDIRS = DMAmon I2C inttest ppidetst ramtest tstdskng rzsz vdctest kbdtest ps2info 2piotst piomon banktest
+SUBDIRS = DMAmon I2C inttest ppidetst ramtest tstdskng rzsz vdctest kbdtest ps2info 2piotst piomon banktest portswp
 DEST = ../../../Binary/Apps/Test
 TOOLS =../../../Tools
 
diff --git a/Source/Apps/Test/portswp/Build.cmd b/Source/Apps/Test/portswp/Build.cmd
new file mode 100644
index 00000000..763cf712
--- /dev/null
+++ b/Source/Apps/Test/portswp/Build.cmd
@@ -0,0 +1,11 @@
+@echo off
+setlocal
+
+set TOOLS=../../../../Tools
+set PATH=%TOOLS%\tasm32;%PATH%
+set TASMTABS=%TOOLS%\tasm32
+
+tasm -t180 -g3 -fFF portswp.asm portswp.com portswp.lst || exit /b
+
+copy /Y portswp.com ..\..\..\..\Binary\Apps\Test\ || exit /b
+
diff --git a/Source/Apps/Test/portswp/Clean.cmd b/Source/Apps/Test/portswp/Clean.cmd
new file mode 100644
index 00000000..9ecb428f
--- /dev/null
+++ b/Source/Apps/Test/portswp/Clean.cmd
@@ -0,0 +1,6 @@
+@echo off
+setlocal
+
+if exist *.com del *.com
+if exist *.lst del *.lst
+if exist *.bin del *.bin
diff --git a/Source/Apps/Test/portswp/Makefile b/Source/Apps/Test/portswp/Makefile
new file mode 100644
index 00000000..81d334fc
--- /dev/null
+++ b/Source/Apps/Test/portswp/Makefile
@@ -0,0 +1,9 @@
+OBJECTS = portswp.com
+DEST = ../../../../Binary/Apps/Test
+TOOLS =../../../../Tools
+
+USETASM=1
+
+include $(TOOLS)/Makefile.inc
+
+TASM=$(BINDIR)/uz80as -t hd64180
diff --git a/Source/Apps/Test/portswp/portswp.asm b/Source/Apps/Test/portswp/portswp.asm
new file mode 100644
index 00000000..dd6d49c2
--- /dev/null
+++ b/Source/Apps/Test/portswp/portswp.asm
@@ -0,0 +1,595 @@
+;===============================================================================
+; PORTSWP - Sweep Ports
+;
+;===============================================================================
+;
+;	Author:  Wayne Warthen (wwarthen@gmail.com)
+;_______________________________________________________________________________
+;
+; Usage:
+;   PORTSWP
+;
+; Operation:
+;   Reads all ports (multiple ways) and displays values read
+;_______________________________________________________________________________
+;
+; Change Log:
+;   2023-02-14 [WBW] Initial release
+;_______________________________________________________________________________
+;
+; ToDo:
+;_______________________________________________________________________________
+;
+;===============================================================================
+; Definitions
+;===============================================================================
+;
+runloc	.equ	$C000		; Running location (upper memory required)
+stksiz	.equ	$40		; Working stack size
+;
+rmj	.equ	3		; intended HBIOS version - major
+rmn	.equ	1		; intended HBIOS version - minor
+;
+restart	.equ	$0000		; CP/M restart vector
+;
+#include "../../../HBIOS/hbios.inc"
+;
+;===============================================================================
+; Code Section
+;===============================================================================
+;
+	.org	$100
+;
+	; relocate worker code to upper memory
+	ld	hl,begin	; start of working code image
+	ld	de,runloc	; running location
+	ld	bc,size		; size of working code image
+	ldir			; copy to upper RAM
+	jp	runloc		; and go
+;
+; Start of working code
+;
+begin	.equ	$		; image loaded here
+;
+	.org	runloc		; now generate running location adresses
+;
+	; setup stack (save old value)
+	ld	(stksav),sp	; save stack
+	ld	sp,stack	; set new stack
+;
+	; initialization
+	call	init		; initialize
+	jr	nz,exit		; abort if init fails
+;
+	; process
+	call 	process		; do main processing
+	jr	nz,exit		; abort on error
+;
+exit:	; clean up and return to command processor
+	call	crlf		; formatting
+	ld	sp,(stksav)	; restore stack
+	;jp	restart		; return to CP/M via restart
+	ret			; return to CP/M w/o restart
+;
+; Initialization
+;
+init:
+	call	crlf2		; formatting
+	ld	de,msgban	; point to version message part 1
+	call	prtstr		; print it
+;
+	call	idbio		; identify active BIOS
+	cp	1		; check for HBIOS
+	jp	nz,errbio	; handle BIOS error
+;
+	ld	a,rmj << 4 | rmn	; expected HBIOS ver
+	cp	d		; compare with result above
+	jp	nz,errbio	; handle BIOS error
+;
+initx
+	; initialization complete
+	xor	a		; signal success
+	ret			; return
+;
+; Process
+;
+process:
+	call	crlf
+	ld	a,($FFE0)	; get current hbios bank id
+	ld	(orgbnk),a	; and save it
+	ld	a,0		; start with port 0
+	ld	(curport),a	; save it for use below
+	; Test for z180 using mlt
+	ld	de,$0506	; 5 x 6
+	mlt	de		; de = 30 if z180
+	ld	a,e		; result to A
+	cp	30		; check if multiply happened
+	jr	nz,loop		; if invalid, then Z80
+	or	$FF		; flag value for Z180
+	ld	(is180),a	; save it
+;
+loop:
+	call	crlf
+	ld	a,(curport)
+	call	prthex
+	ld	a,':'
+	call	prtchr
+;
+	di			; interrupts off
+;
+	ld	hl,vallist	; init value list pointer
+	call	portread	; read the port
+	call	portread	; do it again
+;
+	; restore possibly corrupted bank registers
+	ld	a,(orgbnk)	; get proper bank id
+	call	$FFF3		; restore it
+;
+	ei			; interrupts safe now
+;
+	ld	hl,vallist	; re-init value list pointer
+	ld	b,4		; print 4 values
+prtloop:
+	ld	a,' '
+	call	prtchr
+	ld	a,(hl)
+	call	prthex
+	inc	hl
+	djnz	prtloop
+;
+	; update port and loop as needed
+	ld	a,(curport)	; get current port
+	inc	a		; move to next
+	ld	(curport),a	; save it
+	jr	z,done		; done on wraparound
+	jr	loop		; loop until done
+;
+done:
+;
+	call	crlf2
+	ld	de,msgdone	; message to print
+	call	prtstr		; do it
+;
+	ret			; all done
+;
+;
+;
+portread:
+	ld	a,(is180)
+	or	a
+	jr	nz,portread_z180
+;
+portread_z80:	; user traditional "IN"
+	; read port using IN <portnum>
+	ld	a,(curport)	; get current port
+	ld	(port),a	; modify IN instruction
+	in	a,($FF)		; read the port
+port	.equ	$-1
+	ld	(hl),a		; save it
+	inc	hl		; bump value list pointer
+;
+	; read port using IN (C)
+	ld	a,(curport)	; get current port
+	ld	b,0		; in case 16 bits decoded
+	ld	c,a		; move to reg C
+	in	a,(c)		; read the port
+	ld	(hl),a		; save it
+	inc	hl		; bump value list pointer
+	ret
+;
+portread_z180:	; use "IN0"
+	; read port using IN <portnum>
+	ld	a,(curport)	; get current port
+	ld	(port1),a	; modify IN instruction
+	in0	a,($FF)		; read the port
+port1	.equ	$-1
+	ld	(hl),a		; save it
+	inc	hl		; bump value list pointer
+;
+	; read port using IN (C)
+	ld	a,(curport)	; get current port
+	ld	b,0		; in case 16 bits decoded
+	ld	c,a		; move to reg C
+	in	a,(c)		; read the port
+	ld	(hl),a		; save it
+	inc	hl		; bump value list pointer
+	ret
+;
+; Identify active BIOS.  RomWBW HBIOS=1, UNA UBIOS=2, else 0
+;
+idbio:
+;
+	; Check for UNA (UBIOS)
+	ld	a,($FFFD)	; fixed location of UNA API vector
+	cp	$C3		; jp instruction?
+	jr	nz,idbio1	; if not, not UNA
+	ld	hl,($FFFE)	; get jp address
+	ld	a,(hl)		; get byte at target address
+	cp	$FD		; first byte of UNA push ix instruction
+	jr	nz,idbio1	; if not, not UNA
+	inc	hl		; point to next byte
+	ld	a,(hl)		; get next byte
+	cp	$E5		; second byte of UNA push ix instruction
+	jr	nz,idbio1	; if not, not UNA, check others
+;
+	ld	bc,$04FA	; UNA: get BIOS date and version
+	rst	08		; DE := ver, HL := date
+;
+	ld	a,2		; UNA BIOS id = 2
+	ret			; and done
+;
+idbio1:
+	; Check for RomWBW (HBIOS)
+	ld	hl,(HB_IDENT)	; HL := HBIOS ident location
+	ld	a,'W'		; First byte of ident
+	cp	(hl)		; Compare
+	jr	nz,idbio2	; Not HBIOS
+	inc	hl		; Next byte of ident
+	ld	a,~'W'		; Second byte of ident
+	cp	(hl)		; Compare
+	jr	nz,idbio2	; Not HBIOS
+;
+	ld	b,BF_SYSVER	; HBIOS: VER function
+	ld	c,0		; required reserved value
+	rst	08		; DE := version, L := platform id
+;	
+	ld	a,1		; HBIOS BIOS id = 1
+	ret			; and done
+;
+idbio2:
+	; No idea what this is
+	xor	a		; Setup return value of 0
+	ret			; and done
+;
+; Print character in A without destroying any registers
+;
+prtchr:
+	push	bc		; save registers
+	push	de
+	push	hl
+	ld	e,a		; character to print in E
+	ld	b,BF_CIOOUT	; HBIOS function to output a character
+	ld	c,CIO_CONSOLE	; write to current console unit
+	call	HB_INVOKE	; invoke HBIOS via call
+	pop	hl		; restore registers
+	pop	de
+	pop	bc
+	ret
+;
+prtdot:
+;
+	; shortcut to print a dot preserving all regs
+	push	af		; save af
+	ld	a,'.'		; load dot char
+	call	prtchr		; print it
+	pop	af		; restore af
+	ret			; done
+;
+prtspace:
+;
+	; shortcut to print a space preserving all regs
+	push	af		; save af
+	ld	a,' '		; load dot char
+	call	prtchr		; print it
+	pop	af		; restore af
+	ret			; done
+;
+prtcr:
+;
+	; shortcut to print a dot preserving all regs
+	push	af		; save af
+	ld	a,13		; load CR value
+	call	prtchr		; print it
+	pop	af		; restore af
+	ret			; done
+;
+; Print a zero terminated string at (DE) without destroying any registers
+;
+prtstr:
+	push	de
+;
+prtstr1:
+	ld	a,(de)		; get next char
+	or	a
+	jr	z,prtstr2
+	call	prtchr
+	inc	de
+	jr	prtstr1
+;
+prtstr2:
+	pop	de		; restore registers
+	ret	
+;
+; Print a block of memory nicely formatted
+;  de=buffer address
+;
+dump_buffer:
+	call	crlf
+
+	push	de
+	pop	hl
+	inc	d
+	inc	d
+
+db_blkrd:
+	push	bc
+	push	hl
+	pop	bc
+	call	prthexword		; print start location
+	pop	bc
+	call	prtspace		;
+	ld	c,16			; set for 16 locs
+	push	hl			; save starting hl
+db_nxtone:
+	ld	a,(hl)			; get byte
+	call	prthex			; print it
+	call	prtspace		;
+db_updh:
+	inc	hl			; point next
+	dec	c			; dec. loc count
+	jr	nz,db_nxtone		; if line not done
+					; now print 'decoded' data to right of dump
+db_pcrlf:
+	call	prtspace		; space it
+	ld	c,16			; set for 16 chars
+	pop	hl			; get back start
+db_pcrlf0:
+	ld	a,(hl)			; get byte
+	and	060h			; see if a 'dot'
+	ld	a,(hl)			; o.k. to get
+	jr	nz,db_pdot		;
+db_dot:
+	ld	a,2eh			; load a dot
+db_pdot:
+	call	prtchr			; print it
+	inc	hl			;
+	ld	a,d			;
+	cp	h			;
+	jr	nz,db_updh1		;
+	ld	a,e			;
+	cp	l			;
+	jp	z,db_end		;
+db_updh1:
+; if block not dumped, do next character or line
+	dec	c			; dec. char count
+	jr	nz,db_pcrlf0		; do next
+db_contd:
+	call	crlf			;
+	jp	db_blkrd		;
+
+db_end:
+	ret
+;
+; Print the value in A in hex without destroying any registers
+;
+prthex:
+	push	af		; save AF
+	push	de		; save DE
+	call	hexascii	; convert value in A to hex chars in DE
+	ld	a,d		; get the high order hex char
+	call	prtchr		; print it
+	ld	a,e		; get the low order hex char
+	call	prtchr		; print it
+	pop	de		; restore DE
+	pop	af		; restore AF
+	ret			; done
+;
+; print the hex word value in bc
+;
+prthexword:
+	push	af
+	ld	a,b
+	call	prthex
+	ld	a,c
+	call	prthex 
+	pop	af
+	ret
+;
+; print the hex dword value in de:hl
+;
+prthex32:
+	push	bc
+	push	de
+	pop	bc
+	call	prthexword
+	push	hl
+	pop	bc
+	call	prthexword
+	pop	bc
+	ret
+;
+; Convert binary value in A to ascii hex characters in DE
+;
+hexascii:
+	ld	d,a		; save A in D
+	call	hexconv		; convert low nibble of A to hex
+	ld	e,a		; save it in E
+	ld	a,d		; get original value back
+	rlca			; rotate high order nibble to low bits
+	rlca
+	rlca
+	rlca
+	call	hexconv		; convert nibble
+	ld	d,a		; save it in D
+	ret			; done
+;
+; Convert low nibble of A to ascii hex
+;
+hexconv:
+	and	$0F	     	; low nibble only
+	add	a,$90
+	daa	
+	adc	a,$40
+	daa	
+	ret
+;
+; Print value of A or HL in decimal with leading zero suppression
+; Use prtdecb for A or prtdecw for HL
+;
+prtdecb:
+	push	hl
+	ld	h,0
+	ld	l,a
+	call	prtdecw		; print it
+	pop	hl
+	ret
+;
+prtdecw:
+	push	af
+	push	bc
+	push	de
+	push	hl
+	call	prtdec0
+	pop	hl
+	pop	de
+	pop	bc
+	pop	af
+	ret
+;
+prtdec0:
+	ld	e,'0'
+	ld	bc,-10000
+	call	prtdec1
+	ld	bc,-1000
+	call	prtdec1
+	ld	bc,-100
+	call	prtdec1
+	ld	c,-10
+	call	prtdec1
+	ld	e,0
+	ld	c,-1
+prtdec1:
+	ld	a,'0' - 1
+prtdec2:
+	inc	a
+	add	hl,bc
+	jr	c,prtdec2
+	sbc	hl,bc
+	cp	e
+	ret	z
+	ld	e,0
+	call	prtchr
+	ret
+;
+; Start a new line
+;
+crlf2:
+	call	crlf		; two of them
+crlf:
+	push	af		; preserve AF
+	ld	a,13		; <CR>
+	call	prtchr		; print it
+	ld	a,10		; <LF>
+	call	prtchr		; print it
+	pop	af		; restore AF
+	ret
+;
+; Get the next non-blank character from (HL).
+;
+nonblank:
+	ld	a,(hl)		; load next character
+	or	a		; string ends with a null
+	ret	z		; if null, return pointing to null
+	cp	' '		; check for blank
+	ret	nz		; return if not blank
+	inc	hl		; if blank, increment character pointer
+	jr	nonblank	; and loop
+;
+; Convert character in A to uppercase
+;
+ucase:
+	cp	'a'		; if below 'a'
+	ret	c		; ... do nothing and return
+	cp	'z' + 1		; if above 'z'
+	ret	nc		; ... do nothing and return
+	res	5,a		; clear bit 5 to make lower case -> upper case
+	ret			; and return
+;
+; Add the value in A to HL (HL := HL + A)
+;
+addhl:
+	add	a,l		; A := A + L
+	ld	l,a		; Put result back in L
+	ret	nc		; if no carry, we are done
+	inc	h		; if carry, increment H
+	ret			; and return
+;
+; Jump indirect to address in HL
+;
+jphl:
+	jp	(hl)
+;
+; Short delay functions.  No clock speed compensation, so they
+; will run longer on slower systems.  The number indicates the
+; number of call/ret invocations.  a single call/ret is
+; 27 t-states on a z80, 25 t-states on a z180
+;
+;			; Z80	Z180
+;			; ----	----
+dly64:	call	dly32	; 1728	1600
+dly32:	call	dly16	; 864	800
+dly16:	call	dly8	; 432	400
+dly8:	call	dly4	; 216	200
+dly4:	call	dly2	; 108	100
+dly2:	call	dly1	; 54	50
+dly1:	ret		; 27	25
+
+;
+; Errors
+;
+erruse:	; command usage error (syntax)
+	ld	de,msguse
+	jr	err
+;
+errprm:	; command parameter error (syntax)
+	ld	de,msgprm
+	jr	err
+;
+errbio:	; invalid BIOS or version
+	ld	de,msgbio
+	jr	err
+;
+err:	; print error string and return error signal
+	call	crlf2		; print newline
+;
+err1:	; without the leading crlf
+	call	prtstr		; print error string
+;
+err2:	; without the string
+;	call	crlf		; print newline
+	or	$FF		; signal error
+	ret			; done
+;
+;===============================================================================
+; Storage Section
+;===============================================================================
+;
+is180	.db	0		; non-zero for z180
+orgbnk	.db	0		; original bank id
+curport	.db	0		; current port being processed
+vallist .fill	8,0		; port values read
+;
+stksav	.dw	0		; stack pointer saved at start
+	.fill	stksiz,0	; stack
+stack	.equ	$		; stack top
+;
+; Messages
+;
+msgban	.db	"PORTSWP v1.0, 14-Feb-2023",13,10
+	.db	"Copyright (C) 2023, Wayne Warthen, GNU GPL v3",0
+msguse	.db	"Usage: PORTSWP",13,10
+msgprm	.db	"Parameter error (PORTSWP /? for usage)",0
+msgbio	.db	"Incompatible BIOS or version, "
+	.db	"HBIOS v", '0' + rmj, ".", '0' + rmn, " required",0
+str_sep	.db	": ",0
+;
+;msgcur	.db	"Initial Bank ID = 0x",0
+;msg80	.db	"Hello from bank 0x80!",0
+;msgxcal	.db	"Inter-bank procedure call test...",0
+msgdone	.db	"End of Port Sweep",0
+;
+;
+;
+size	.equ	$ - runloc
+;
+	.end