CAS40 data types¶

Data in the CAS40 protocol is composed a header, followed by data parts, all prefixed with 0x3A.

Headers are always 40 bytes long, and of the following format:

Offset	Size	Field name	Description	Values
0 (0x00)	1 B	Prefix	Header prefix.	`\x3A`
1 (0x01)	2 B	Type (TY)	File type.	See following sections.
3 (0x03)	36 B	Type-specific data	Data for which the format is specific to the type.	See the type description for the format of this component. If the type-specific data is less than 36 bytes, the rest is filled with `\xFF`.
39 (0x27)	1 B	Checksum (CS)

The type-specific data and count, size and format of data packets sent after the header depend on the type.

See the following subsections for more information.

`\x17\x17` AL End¶

This header represents an end of sequence when in AL mode. It is only used with the CASIOLINK protocol, when using the CAS40 header format, and when the AL data type has been sent and received at least once; see AL Mode for more information.

This is not followed by any data parts.

`\x17\xFF` End¶

This header represents an end of sequence. It is only used with the CASIOLINK protocol, when using the CAS40 header format.

This is not followed by any data parts.

Note

This prefix is common to all sentinels in the CAS40 variant, i.e. headers and data parts, of the size corresponding to the expected data part size.

Note

This data type does not end the communication when AL mode has been enabled; see AL Mode.

`A1` Dynamic Graph¶

Type-specific data is the following:

Offset	Size	Field name	Description	Values
0 (0x00)	1 B	Reserved		Set to `\0`.
2 (0x02)	2 B	Length (L)	Size of the data part, plus 2.	8-bit integer.

This is followed by 1 data part of L - 2 bytes, being the definition of the dynamic graph with a \xFF sentinel.

This data type is final.

`AA` Dynamic Graph in Bulk¶

This file type is actually the same as A1 Dynamic Graph, except it is in a context where multiple editor programs are being sent, i.e. the data type is non-final.

`AD` All Variable Memories¶

This data type contains all variable memories currently defined on the device.

Type-specific data is the following:

Offset	Size	Field name	Description	Values
0 (0x00)	2 B	Unknown		Set to `"CA"`.
2 (0x02)	2 B	Count (C)	Number of elements, including the sentinel.	Big endian 16-bit integer.

There are C times data parts of 22 bytes each, the last one being the sentinel, with the following data:

Offset	Size	Field name	Description	Values
0 (0x00)	2 B	Type	Data part type.	`\0\0` for the cells, `\x17\xFF` for the sentinel.
2 (0x02)	10 B	Value (real part)		CASIOLINK-style BCD
12 (0x0C)	10 B	Value (imaginary part)		CASIOLINK-style BCD

This data type is final.

`AL` All¶

This data type signals that the calculator is about to send all of its data.

This does does have type-specific data, and is not followed by any data parts.

Note

If this data type is received at least once, it means that all final data types become non-final, and that a special sentinel header is required; see AL Mode for more information.

`AM` Variable Memories¶

This is equivalent to AD All Variable Memories, but only returns variables designated using a letter or symbol.

`BU` Backup¶

Type-specific data for such files are the following:

Offset	Size	Field name	Description	Values
0 (0x00)	7 B	Backup Type (BUT)		Backup type, among: `TYPEA00`: fx-9700GH style backup (32768 bytes). `TYPEA02`: CFX-9800G style backup (32768 bytes).

Offset

Size

Field name

Description

Values

0 (0x00)

7 B

Backup Type (BUT)

Backup type, among:

TYPEA00: fx-9700GH style backup (32768 bytes).
TYPEA02: CFX-9800G style backup (32768 bytes).

There is one data part, for which the size depends on the backup type.

This data type is final.

`DC` Color Screenshot¶

Type-specific data for such files are the following:

Offset

Size

Field name

Description

Values

0 (0x00)

1 B

Height (H)

8-bit unsigned integer.

Usually set to 64, which can be translated as @ (hence some programs matching DC@).

1 (0x01)

1 B

Width (W)

8-bit unsigned integer.

2 (0x02)

1 B

Screenshot format

Screenshot format, among the following:

Value	Description
`\x11`	Multiple 1bpp picture format with CAS50 order and palette prefix

3 (0x03)

1 B

Direction (DR)

U (?)

4 (0x04)

1 B

Byte Direction

W (?)

5 (0x05)

1 B

Bit Weight (BW)

F (?)

6 (0x06)

1 B

Sheet count

Should be set to \x03.

Todo

Document the role of the different fields here!

This is followed by 3 data parts, each representing a monochrome picture with a one-byte prefix representing the color.

This data type is final.

`DD` Monochrome Screenshot¶

Type-specific data for such files are the following:

Offset

Size

Field name

Description

Values

0 (0x00)

1 B

Height (H)

8-bit unsigned integer.

Usually set to 64, which can be translated as @ (hence some programs matching DD@).

1 (0x01)

1 B

Width (W)

8-bit unsigned integer.

2 (0x02)

1 B

Screenshot format

Screenshot format, among the following:

Value	Description
`\x10`	1bpp monochrome picture format with CAS50 order.

3 (0x03)

1 B

Direction (DR)

D (?)

4 (0x04)

1 B

Byte Direction

W (?)

5 (0x05)

1 B

Bit Weight (BW)

F (?)

Todo

Document the role of the different fields here!

This is followed by a single data part representing the monochrome picture.

This data type is final.

`DM` Defined Memories¶

This is equivalent to AD All Variable Memories, but only returns defined memories.

`EN` Single Editor Program¶

Type-specific data for such files are the following:

Offset	Size	Field name	Description	Values
0 (0x00)	1 B	Reserved		Set to `\0`.
1 (0x01)	2 B	Data Length (DL)	Length of the program, plus 2 (i.e. you must subtract 2 from this number before transmitting)	Big endian 16-bit unsigned integer.
3 (0x03)	2 B	Reserved.		Should be set to `\xFF`.
5 (0x05)	12 B	File name (FN)	Name of the file for an editor program.	`HELLO\xFF\xFF\xFF\xFF\xFF\xFF\xFF`

This is followed by a single program being the program’s content.

This data type is final.

`EP` Single Password Protected Editor Program¶

Type-specific data for such files are the following:

Offset	Size	Field name	Description	Values
0 (0x00)	1 B	Reserved		Set to `\0`.
1 (0x01)	2 B	Data Length (DL)	Length of the program, plus 2 (i.e. you must subtract 2 from this number before transmitting)	Big endian 16-bit unsigned integer.
3 (0x03)	2 B	Reserved.		Should be set to `\xFF`.
5 (0x05)	12 B	File name (FN)	Name of the file for an editor program.	`HELLO\xFF\xFF\xFF\xFF\xFF\xFF\xFF`
17 (0x11)	12 B	File password (FP)	Password of the file for an editor program.	`WORLD\xFF\xFF\xFF\xFF\xFF\xFF\xFF`

This is followed by a single program being the program’s content.

This data type is final.

`F1` Single Function¶

Type-specific data is the following:

Offset	Size	Field name	Description	Values
0 (0x00)	1 B	Reserved		Set to `\0`.
1 (0x01)	2 B	Data Length (DL)	Length of the program, plus 2 (i.e. you must subtract 2 from this number before transmitting)	Big endian 16-bit unsigned integer.
3 (0x03)	2 B	Reserved.		Should be set to `\0`.

This is followed by a single data part being the program’s content.

This data type is final.

`F6` Multiple Functions¶

Type-specific data is the following:

Offset	Size	Field name	Description	Values
0 (0x00)	1 B	Reserved		Set to `\0`.
1 (0x01)	2 B	Data Length (DL)	Length of the program, plus 2 (i.e. you must subtract 2 from this number before transmitting)	Big endian 16-bit unsigned integer.
3 (0x03)	2 B	Reserved.		Should be set to `\0`.
5 (0x05)	2 B	Function 1 Length (FL1)		Big endian 16-bit length of the function 1 definition.
7 (0x07)	2 B	Function 2 Length (FL2)		Big endian 16-bit length of the function 2 definition.
9 (0x09)	2 B	Function 3 Length (FL3)		Big endian 16-bit length of the function 3 definition.
11 (0x0B)	2 B	Function 4 Length (FL4)		Big endian 16-bit length of the function 4 definition.
13 (0x0D)	2 B	Function 5 Length (FL5)		Big endian 16-bit length of the function 5 definition.
15 (0x0F)	2 B	Function 6 Length (FL6)		Big endian 16-bit length of the function 6 definition.

This is followed by a single data part with the contents of all of the functions.

This data type is final.

`FN` Single Editor Program in Bulk¶

This file type is actually the same as EN Single Editor Program, except it is in a context where multiple editor programs are being sent, i.e. the data is non-final.

`FP` Single Password Protected Editor Program in Bulk¶

This file type is actually the same as EP Single Password Protected Editor Program, except it is in a context where multiple editor programs are being sent, i.e. the data is non-final.

`G1` Graph Function¶

Type-specific data is the following:

Offset

Size

Field name

Description

Values

0 (0x00)

1 B

Reserved

Set to \0.

1 (0x01)

2 B

Length (L)

Length of the contents, plus two.

Big-endian 16-bit integer.

3 (0x03)

2 B

Unknown

Set to \0 by default.

5 (0x05)

2 B

Type (T)

Big-endian 16-bit integer, for which the values are:

Value	Description
`0x0000`	Unset
`0x0100`	Rect (`Y=...X`)
`0x0102`	Pol (`r=...θ`), with optional `0xF6` (`,`) separator.
`0x0103`	Parm (`Xt=...T`)
`0x0104`	Ineq (`Y>...X`)
`0x0105`	Ineq (`Y<...X`)
`0x0106`	Ineq (`Y≥...X`)
`0x0107`	Ineq (`Y≤...X`)

There is exactly 1 data part of L - 2 bytes, containing the source of the Graph Function.

This data type is final.

`GA` Graph Function in Bulk¶

This file type is actually the same as G1 Graph Function, except it is in a context where multiple graph functions are being sent, i.e. the data is non-final.

`GF` Factor¶

Type-specific data is the following:

Offset	Size	Field name	Description	Values
0 (0x00)	2 B	Unknown		Set to `"RA"`.
2 (0x02)	2 B	Unknown		Set to `\x00\x02`.

There is exactly 1 data part of 22 bytes, of the following format:

Offset	Size	Field name	Values
0 (0x00)	2 B	Reserved	Set to `\0`.
2 (0x02)	10 B	Xfact	CASIOLINK-style BCD
12 (0x0C)	10 B	Yfact	CASIOLINK-style BCD

This data type is final.

`GR` Range¶

Type-specific data is the following:

Offset	Size	Field name	Description	Values
0 (0x00)	2 B	Unknown		Set to `"RA"`.
2 (0x02)	2 B	Unknown		Set to `\x00\x09`.

There is exactly 1 data part of 92 bytes, of the following format:

Offset	Size	Field name	Values
0 (0x00)	2 B	Reserved	Set to `\0`.
2 (0x02)	10 B	Xmin	CASIOLINK-style BCD
12 (0x0C)	10 B	Xmax	CASIOLINK-style BCD
22 (0x16)	10 B	Xscale	CASIOLINK-style BCD
32 (0x20)	10 B	Ymin	CASIOLINK-style BCD
42 (0x2A)	10 B	Ymax	CASIOLINK-style BCD
52 (0x34)	10 B	Yscale	CASIOLINK-style BCD
62 (0x3E)	10 B	Tmin, θmin	CASIOLINK-style BCD
72 (0x48)	10 B	Tmax, θmax	CASIOLINK-style BCD
82 (0x52)	10 B	Tpitch, θpitch	CASIOLINK-style BCD

This data type is final.

`GT` Function Table¶

Type-specific data is the following:

Offset	Size	Field name	Description	Values
0 (0x00)	2 B	Reserved		Set to `"RA"`.
2 (0x02)	2 B	Length (L)	Length of the function definition, plus two.	Big endian 16-bit integer.
4 (0x04)	2 B	Count (C)		Big endian 16-bit integer.
6 (0x06)	2 B	Unknown		Set to `\0\0`.

There is C + 2 data parts, where:

The first data part is the source function from which the table is computed, which is L - 2 bytes long and includes a sentinel (\xFF).

The second data part are the table properties, which are 32 bytes long. They have the following format:

Offset	Size	Field name	Values
0 (0x00)	2 B	Reserved	Set to `\0\0`.
2 (0x02)	10 B	Start	CASIOLINK-style BCD
12 (0x0C)	10 B	End	CASIOLINK-style BCD
22 (0x16)	10 B	Pitch	CASIOLINK-style BCD

The next C data parts are the cells, which are 22 bytes long. They have the following format:

Offset

Size

Field name

Description

Values

0 (0x00)

2 B

Reserved

Set to \0\0.

2 (0x02)

10 B

X

CASIOLINK-style BCD

12 (0x0C)

10 B

Y

CASIOLINK-style BCD

This data type is final.

`M1` Single Matrix¶

Type-specific data is the following:

Offset	Size	Field name	Values
0 (0x00)	2 B	Reserved	Set to `"RA"`.
2 (0x02)	1 B	Width (W)	Width of the matrix.
3 (0x03)	1 B	Height (H)	Height of the matrix.

There are W times H + 1 data parts of 14 bytes each, the last one being the sentinel, with the following data:

Offset	Size	Field name	Description	Values
0 (0x00)	2 B	Type	Data part type.	`\0\0` for the cells, `\x17\xFF` for the sentinel.
2 (0x02)	1 B	X coordinate (X)	Horizontal coordinate of the cell, starting at 1.	8-bit integer.
3 (0x03)	1 B	Y coordinate (Y)	Vertical coordinate of the cell, starting at 1.	8-bit integer.
4 (0x04)	10 B	Value (V)	Value contained by the cell.	CASIOLINK-style BCD

This data type is final.

`MA` Single Matrix in Bulk¶

Equivalent to M1 Single Matrix, except:

There are W times H data parts instead of W times H, as the sentinel is not present;
The data type is not final.

`P1` Single Numbered Program¶

Type-specific data for such files are the following:

Offset

Size

Field name

Description

Values

0 (0x00)

1 B

Reserved.

Should be set to \0.

1 (0x01)

2 B

Data Length (DL)

Length of the program, plus 2 (i.e. you must subtract 2 from this number before transmitting)

Big endian 16-bit unsigned integer.

3 (0x03)

1 B

Program Type (PT)

Type of the program.

One of the following:

Value	Type
`0x02`	Store-Stats Data
`0x04`	Matrix
`0x10`	Standard Deviation
`0x20`	Linear Regression
`0x40`	Base-n
`0x80`	Draw stats graph

4 (0x04)

1 B

Reserved.

Should be set to \0.

This is followed by a single data part containing the program’s content.

This data type is final.

`PD` Polynomial Equation¶

Type-specific data is the following:

Offset	Size	Field name	Description	Values
0 (0x00)	2 B	Reserved		Set to `"RA"`.
2 (0x02)	2 B	Degree (D)		Big endian 16-bit integer.

The contents depends on the degree (D) field:

For degree 2, there is 1 data part which is 32 bytes long, and contains the components of the ax²+bx+c=0 equation, in the following format:

Offset

Size

Field name

Description

Values

0 (0x00)

2 B

Reserved

Set to \0\0

2 (0x02)

10 B

a

CASIOLINK-style BCD

12 (0x0C)

10 B

b

CASIOLINK-style BCD

22 (0x16)

10 B

c

CASIOLINK-style BCD

For degree 3, there is 1 data part which is 42 bytes long, and contains the components of the ax³+bx²+cx+d=0 equation, in the following format:

Offset	Size	Field name	Values
0 (0x00)	2 B	Reserved	Set to `\0\0`
2 (0x02)	10 B	a	CASIOLINK-style BCD
12 (0x0C)	10 B	b	CASIOLINK-style BCD
22 (0x16)	10 B	c	CASIOLINK-style BCD
32 (0x20)	10 B	d	CASIOLINK-style BCD

This data type is final.

`PZ` Multiple Numbered Programs¶

This file contains all 38 numbered programs from the program.

Type-specific data for such files are the following:

Offset	Size	Field name	Description	Values
0 (0x00)	1 B	Reserved.		Should be set to `\0`.
1 (0x01)	2 B	Data Length (DL)	Total data length for all programs, plus 2 (i.e. you must subtract 2 from this number before transmitting)	Big endian 16-bit unsigned integer.
3 (0x03)	2 B	Reserved.		Should be set to `\0`.

This is followed by 2 data parts:

A part of 190 bytes, used to include 38 times the type-specific data from P1 (for 38 programs).
A part containing data for all 38 programs concatenated, for which the length is equal to DL - 2.

See P1 Single Numbered Program for more information.

This data type is final.

`RT` Recursion Table¶

Type-specific data is the following:

Offset	Size	Field name	Description	Values
0 (0x00)	2 B	Reserved		Set to `"RA"`.
2 (0x02)	2 B	Length (L)	Length of the function definition, plus two.	Big endian 16-bit integer.
4 (0x04)	2 B	Count (C)		Big endian 16-bit integer.
6 (0x06)	2 B	Unknown		Set to `\0\0`.

There is C + 2 data parts, where:

The first data part is the source function from which the table is computed, which is L - 2 bytes long and includes a sentinel (\xFF).
The second data part are the table properties, which are 22 bytes long. They have the following format:

Offset

Size

Field name

Description

Values

0 (0x00)

2 B

Reserved

Set to \0\0.

2 (0x02)

10 B

nStart

CASIOLINK-style BCD

12 (0x0C)

10 B

nEnd

CASIOLINK-style BCD

The next C data parts are the cells, which are 32 bytes long. They have the following format:

Offset	Size	Field name	Values
0 (0x00)	2 B	Reserved	Set to `\0\0`.
2 (0x02)	10 B	n	CASIOLINK-style BCD
12 (0x0C)	10 B	an	CASIOLINK-style BCD
22 (0x16)	10 B	Σan	CASIOLINK-style BCD

This data type is final.

`SD` Simultaneous Equations¶

Type-specific data is the following:

Offset	Size	Field name	Values
0 (0x00)	2 B	Reserved	Set to `"RA"`.
2 (0x02)	1 B	Width (W)	8-bit integer.
3 (0x03)	1 B	Height (H)	8-bit integer.

There is W * H + 1 data parts, each 14 bytes long, of the following format:

Offset	Size	Field name	Description	Values
0 (0x00)	2 B	Type	Data part type.	`\0\0` for the cells, `\x17\xFF` for the sentinel.
2 (0x02)	1 B	X	Horizontal coordinate in the matrix, starting from 1.	8-bit integer.
3 (0x03)	1 B	Y	Vertical coordinate in the matrix, starting from 1.	8-bit integer.
4 (0x02)	10 B	Value for the cell.		CASIOLINK-style BCD

This data type is final.

`SR` Paired Variable Data¶

Type-specific data is the following:

Offset	Size	Field name	Description	Values
0 (0x00)	2 B	Reserved		Set to `"RA"`.
2 (0x02)	2 B	Count (C)	Number of elements, including the sentinel.	Big endian 16-bit integer.

There are C times data parts of 32 bytes each, the last one being the sentinel, with the following data:

Offset	Size	Field name	Description	Values
0 (0x00)	2 B	Type	Data part type.	`\0\0` for the cells, `\x17\xFF` for the sentinel.
2 (0x02)	10 B	X value		CASIOLINK-style BCD
12 (0x0C)	10 B	Y value		CASIOLINK-style BCD
22 (0x16)	10 B	f value		CASIOLINK-style BCD

This data type is final.

`SS` Single Variable Data¶

Type-specific data is the following:

Offset	Size	Field name	Description	Values
0 (0x00)	2 B	Reserved		Set to `"RA"`.
2 (0x02)	2 B	Count (C)	Number of elements, including the sentinel.	Big endian 16-bit integer.

There are C + 1 data parts of 22 bytes each, the last one being the sentinel, with the following data:

Offset	Size	Field name	Description	Values
0 (0x00)	2 B	Type	Data part type.	`\0\0` for the cells, `\x17\xFF` for the sentinel.
2 (0x02)	10 B	X value		CASIOLINK-style BCD
12 (0x0C)	10 B	f value		CASIOLINK-style BCD

This data type is final.

CAS40 data types¶

\x17\x17 AL End¶

\x17\xFF End¶

A1 Dynamic Graph¶

AA Dynamic Graph in Bulk¶

AD All Variable Memories¶

AL All¶

AM Variable Memories¶

BU Backup¶

DC Color Screenshot¶

DD Monochrome Screenshot¶

DM Defined Memories¶

EN Single Editor Program¶

EP Single Password Protected Editor Program¶

F1 Single Function¶

F6 Multiple Functions¶

FN Single Editor Program in Bulk¶

FP Single Password Protected Editor Program in Bulk¶

G1 Graph Function¶

GA Graph Function in Bulk¶

GF Factor¶

GR Range¶

GT Function Table¶

M1 Single Matrix¶

MA Single Matrix in Bulk¶

P1 Single Numbered Program¶

PD Polynomial Equation¶

PZ Multiple Numbered Programs¶

RT Recursion Table¶

SD Simultaneous Equations¶

SR Paired Variable Data¶

SS Single Variable Data¶

`\x17\x17` AL End¶

`\x17\xFF` End¶

`A1` Dynamic Graph¶

`AA` Dynamic Graph in Bulk¶

`AD` All Variable Memories¶

`AL` All¶

`AM` Variable Memories¶

`BU` Backup¶

`DC` Color Screenshot¶

`DD` Monochrome Screenshot¶

`DM` Defined Memories¶

`EN` Single Editor Program¶

`EP` Single Password Protected Editor Program¶

`F1` Single Function¶

`F6` Multiple Functions¶

`FN` Single Editor Program in Bulk¶

`FP` Single Password Protected Editor Program in Bulk¶

`G1` Graph Function¶

`GA` Graph Function in Bulk¶

`GF` Factor¶

`GR` Range¶

`GT` Function Table¶

`M1` Single Matrix¶

`MA` Single Matrix in Bulk¶

`P1` Single Numbered Program¶

`PD` Polynomial Equation¶

`PZ` Multiple Numbered Programs¶

`RT` Recursion Table¶

`SD` Simultaneous Equations¶

`SR` Paired Variable Data¶

`SS` Single Variable Data¶