hp97s

Model:	-97S, differences from -97A

General:
	Name:			I/O Calculator
	Code-Name:		Ricochet
	Family:			Topcat
	Firsts:			serial output, last Topcat
	Introduction:
		Date:		1977-12-1
		Price:		$1375
	Discontinuation:
		Date:		?
		Price:		?
	Production-Run:		?

Physical:
	I/O-Ports:		BCD serial input/ 4-bit output, compatible
				with TTL, DTL, CMOS, NMOS, and high-threshold
				logic families
	Temperature-Range:
		Operating:	10 to 40 deg C
		Charging:	10 to 40 deg C
		Storage:	-40 to 50 deg C


Notes::

This model was designed at HP Fort Collins, Colorado and not
Corvallis.  The code name referred to bouncing data in and out.

Claimed 3-6 hours of use from a full charge.  Recharge times: OFF 6
hours, ON 17 hours.

(The notes do not attempt to supply all line definitions and signal
timing information.)

Binary input values equate to instruactions as:

	0000	0
	0001	1
	0010	2
	0011	3
	0100	4
	0101	5
	0110	6
	0111	7
	1000	8
	1001	9
	1010	.
	1011	EEX
	1100	ENTER^
	1101	A (as in continue at label A)
	1110	CHS
	1111	no-op

Note that the assignment of 1111 to no-op means that unused line
blocks can be left unconnected.

Flags 0-3 are output.  All flags are controlled by their respective
SF/CF instructions.  In addition, flag 3 is set by the machine if
data entry is detected from the keyboard, so a clear flag 3 after an
A instruction means that input was from the serial interface.  Note
that this flag setting does not alter the value output on the F3-
line.

Connector is a 50-pin telephone-type.  Pinout is:

	GND	1		26	LE-
	F3-	2		27	LOAD-
	F2-	3		28	INHIBIT
	F1-	4		29	LOAD
	F0	5		30	T/C-
	I1	6		31	J1
	I2	7		32	J2
	I4	8		33	J4
	I8	9		34	J8
	G1	10		35	H1
	G2	11		36	H2
	G4	12		37	H4
	G8	13		38	H8
	E1	14		39	F1
	E2	15		40	F2
	E4	16		41	F4
	E8	17		42	F8
	C1	18		43	D1
	C2	19		44	D2
	C4	20		45	D4
	C8	21		46	D8
	A1	22		47	B1
	A2	23		48	B2
	A4	24		49	B4
	A8	25		50	B8