hp28s

Model:	-28S, differences from -28C

General:
	Name:			Advanced Scientific Calculator
	Code-Name:		Orlando
	Features:		?
	Firsts:			graphics objects, directories for
				user variables
	Introduction:
		Date:		1988-1-4
		Price:		$235
	Discontinuation:
		Date:		1992-4-1
		Price:		$195
	Production-Run:		?

Data:
	Data-Types-and-Sizes:	?
		10	binary integer	10.5		# 1010b
			  1-64 bits			# 765o
							# 987d
							# FEDh

Memory:
	Flags:			46	set by GETI and PUTI if they wrap
				47	double spaced printing
	User-RAM-Bytes:		32,400
	Total-RAM-Bytes:	32K
	ROM-Bytes:		128K

Physical:
	Processor:		Lewis, 1 MHz (uses two, one has CPU disabled)
	Chip-Count:		?

Key-Labels-Maroon-Maroon-Above::

Left

[ARRAY]	[BINARY][COMPLX][STRING][LIST]	[REAL]
[STACK]	[STORE]	[MEMORY][ALGBRA][STAT]	[PRINT]
|----- PROGRAM ------|
[CONTRL][BRANCH][TEST]	[]	CATALOG	UNITS
\<=	\>=	\->	\GS	\^o	\Gm
<	>	"	}	]	)
NEWLINE	\>>	\=/	?	\GaLOCK

Right (top row labels are in white)

INS	DEL	^	v	<	>
[]	[MODE]	[LOGS]	[PLOT]	[CUSTOM]PREV
EDIT	VIEW^	VIEWv	ROLL	SWAP
VISIT	COMMAND	UNDO	LAST	1/x
RCL	PURGE	\.S	d/dx	^
->NUM	CONT	%	%CH	\v/x
				 2
OFF	CLEAR	\pi	CONVERT	x

Programmable-Operations::

->LCD		put grob into LCD
c		speed of light constant
COMB		combinations
CRDIR		create directory
DGTIZ		activate interactive plot mode
HOME		move to home directory
LCD->		return LCD as a grob
MENU		select a built-in menu
PATH		returns current path
PERM		compute permutations
POS		less restrictive definition
VARS		return list of variables

Non-Programmable-Operations::

no +CMD
no +LAST
no +ML
no +UND
no -CMD
no -LAST
no -ML
no -UND
CMD		enable/disable LAST CMD mode
COMPLX		bring up menu
CONTRL		bring up menu
CUSTOM		custom menu
MENUS		toggles shifted and unshifted actions of A-R keys
ML		toggles multi-line display mode
ON + <- + ENTER, then S puts the machine into COMA mode (loses stack
		and halts timer, does not destroy memory)
ON + L		print screen
ON + NEXT	start keyboard test
no ON + v
no RDX.
RDX,		toggle radix
no SCAN
no STOP
UNDO		toggle undo saving
\Ga		toggles entry mode from immediate to alpha to algebraic
shift \Ga	 toggles menu lock

Menus::

BINARY:	DEC	HEX	OCT	BIN	STWS	RCWS
	RL	RR	RLB	RRB	R->B	B->R
	SL	SR	SLB	SRB	ASR
	AND	OR	XOR	NOT

LIST:	->LIST	LIST->	PUT	GET	PUTI	GETI
	POS	SUB	SIZE

MEMORY:	MEM	MENU	ORDER	PATH	HOME	CRDIR
	VARS	CLUSR

MODE:	STD	FIX	SCI	ENG	DEG	RAD
	CMD	UNDO	LAST	ML	RDX,	PRMD

PLOT:	STEQ	RCEQ	PMIN	PMAX	INDEP	DRAW
	PPAR	RES	AXES	CENTR	*W	*H
	STO\GS	RCL\GS	COL\GS	SCL\GS	DRW\GS
	CLLCD	DGTIZ	PIXEL	DRAX	CLMF	PRLCD

PRINT:	PR1	PRST	PRVAR	PRLCD	CR	TRAC
	PRSTC	PRUSR	PRMD

REAL:	NEG	FACT	RAND	RDZ	MAXR	MINR
	ABS	SIGN	MANT	XPON
	IP	FP	FLOOR	CEIL	RND
	MAX	MIN	MOD	%t

STAT:	\GS+	\GS-	N\GS	CL\GS	STO\GS	RCL\GS
	TOT	MEAN	SDEV	VAR	MAX\GS	MIN\GS
	COL\GS	CORR	COV	LR	PREDV
	UTPC	UTPF	UTPN	UTPT	COMB	PERM

STRING:	->STR	STR->	CHR	NUM	->LCD	LCD->
	POS	SUB	SIZE	DISP

USER:	user variables

Bugs/ROM-Versions::

2BB	first version

if you create a 256 x 256 matrix, you get memory lost

Notes::

Memory is now from an industry-standard chip instead of a -71B-type
chip.  A "Power Lost" message has been added.  The battery compartment
is lined with foam.  The display has non-glare glass.  One-key
operators are now entered into programs with spaces around them.  The
definitions of some units have been adjusted.  Program and variable
printing has been cleaned up and improved.

HP28S: Hardware I/O basics document at:

	http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=275

A special version was produced celebrating 100 years of the American
Mathematical Society.