What is the correct CRC-32 checksum for 400/800 OSB?

[ACML]

Is the CRC-32 checksum for rev B (NTSC)= 0e86d61d? I have this and another version that I believe starts with a "3". I'm guessing the one that starts with a "3" is the PAL version of the 400/800 B-ROM.

[russg]

Is the CRC-32 checksum for rev B (NTSC)= 0e86d61d? I have this and another version that I believe starts with a "3". I'm guessing the one that starts with a "3" is the PAL version of the 400/800 B-ROM.

I get:

 

3E28A1FE

 

The OSB from Atari800WinPlus 4.

 

Opps, I gues that's PAL, from my copy of OSB, the same as yours.

 

0E86D61D

Edited October 19, 2010 by russg

[ACML]

I think that 3E28A1FE is a PAL version of OS-B CRC-32 checksum. I believe that as the OS-A verion that came with Atari800Win and Xformeras has the PAL version CRC-32 checksum. An emulator wouldn't care whether its PAL or NTSC since there is no real hardware. Can anyone clarify this issue. My belief is that the CRC-32 checksum for NTSC 400/800 OS-B is 0e86d61d.

[russg]

I think that 3E28A1FE is a PAL version of OS-B CRC-32 checksum. I believe that as the OS-A verion that came with Atari800Win and Xformeras has the PAL version CRC-32 checksum. An emulator wouldn't care whether its PAL or NTSC since there is no real hardware. Can anyone clarify this issue. My belief is that the CRC-32 checksum for NTSC 400/800 OS-B is 0e86d61d.

I found this from Freddy Offenga:

 

Atari 8-bit Operating Systems

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 

Version 3.4, 2005-11-26

By Freddy Offenga

 

 

400/800 10kB OS roms

~~~~~~~~~~~~~~~~~~~~

 

Rev. TV Date CRC-32 Part Nr(s)

~~~~ ~~~~~ ~~~~~~~~~~~ ~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~

A NTSC 1979 0xc1b3bb02 CO12499A, CO14599A, CO12399B

A PAL 1979 0x72b3fed4 CO15199, CO15299, CO12399B

B NTSC 1981 0x0e86d61d CO12499B, CO14599B, 12399B

B PAL (?) (?) (?)

 

 

XL/XE 16kB OS roms

~~~~~~~~~~~~~~~~~~

 

Rev. System Date CRC-32 Part Nr(s)

~~~~ ~~~~~~ ~~~~~~~~~~~ ~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~

10 1200XL 10/26/1982 0xc5c11546 CO60616A, CO60617A

11 1200XL 12/23/1982 (?) CO60616B, CO60617B

1 600XL 03/11/1983 0x643bcc98 CO62024

2 XL/XE 05/10/1983 0x1f9cd270 CO61598B

3 800XE 03/01/1985 0x29f133f7 C300717

4 XEGS 05/07/1987 0x1eaf4002 C101687

 

 

(?) This information is missing. If someone can supply this info,

please write me an e-mail.

 

 

NOTES:

The 400/800 O.S's consist of three ROMs (two 4kB and one 2kB).

The 1200XL contains two ROMs for the OS (8k each), XL/XE's use a single

16k ROM and the 16k XEGS OS is stored in a 32k ROM (together with 8k

BASIC and 8k for Missile Command).

 

 

Origins of ROM information

~~~~~~~~~~~~~~~~~~~~~~~~~~

400/800 rev.A NTSC All information from OS board C012989 (Rev D) and

rom dumps.

400/800 rev.A PAL All info found in two Atari 400's and Atari 800

ROM module CX801.P

400/800 rev.B NTSC Information from a ROM dump and the rev.B source

listing. The part numbers were listed in the

catalog from 'Best Electronics'. According to

'Mapping the Atari' rev.B ROMs have a 'B' at the

end of the part number, therefore I figure these

part numbers are from rev.B.

400/800 rev.B PAL Could exist, since the NTSC version exists and

there's some conditional PAL/NTSC assembly in

the rev.B source code

1200XL rev.10 PAL/NTSC All info found in an Atari 1200XL. The XL/XE

rev.2 source code refers to it as rev.10.

'Best Electronics' calls it rev.A.

1200XL rev.11 PAL/NTSC Refered to rev.11 by the XL/XE source code.

'Best Electronics' calls it rev.B.

XL/XE rev.1 All info found in an Atari 600XL

XL/XE rev.2 All info found in an Atari 800XL

XL/XE rev.3 All info found in an 800XE

XL/XE rev.4 All info found in an Atari XE Game System

 

 

O.S. Authors and dates

~~~~~~~~~~~~~~~~~~~~~~

The following info is from the Atari XL/XE rev.2 source code.

 

Revision A (400/800)

D.Crane / A.Miller / L.Kaplan / R.Whitehead

 

Revision B (400/800)

Fix several problems.

M.Mahar / R.S.Scheiman

 

Revision 10 (1200XL)

Support 1200XL, add new features.

H.Stewart / L.Winner / R.S.Scheiman /

Y.M.Chen / M.W.Colburn 10/26/82

 

Revision 11 (1200XL)

Fix several problems.

R.S.Scheiman 12/23/82

 

Revision 1 (600XL/800XL)

Support PBI and on-board BASIC.

R.S.Scheiman / R.K.Nordin / Y.M.Chen 03/11/83

 

Revision 2 (600XL/800XL)

Fix several problems.

R.S.Scheiman 05/10/83

Bring closer to coding standard (object unchanged)

R.K.Nordin 11/01/83

 

 

Vapour-ware

~~~~~~~~~~~

The following OS roms originate from rare Atari 8-bit systems.

Since I don't own any of these (unfortunately), I don't have much

information about these roms. Who can help me?

 

I've got two 16K rom dumps from the 1450XLD. Both ID's are rev.3.

The first dated 3/23/1984 comes from the 'Pooldisk Too' CD-ROM

(filename: 1540os3.v0) and the second dated 6/21/1984 was send to

me by Nir Dary (filename: os1450.128). Main differences between

these two are in the first 3K ($C000 - $CBFF).

 

The XL/XE OS rev.3B is from an Atari from Arabia. It's probably based

on rev.3. There are changes in the fonts (Arab characters) and several

patches in the code. More info at:

http://www.savetz.com/vintagecomputers/arabic65xe/

 

Rev. Found in Size CRC-32 Date

~~~~ ~~~~~~~~ ~~~~~ ~~~~~~~~~~~ ~~~~~~~~~~

3 1450XLD 16kB 0x0d477aa1 3/23/1984

3 1450XLD 16kB 0xd425a9cf 6/21/1984

3B 65XE 16kB 0xf0a236d3 7/21/1984

 

 

References

~~~~~~~~~~

- The modified september Atari 400/800 computer operating system

listing, revision B, ©1982 Atari.

- The Atari O.S. source code rev.2, ©1984 Atari.

- Atari XL addendum Atari home computer system operating system

manual: supplement to Atari 400/800 technical reference notes.

- Best Electronics, catalog of Atari 8-bit parts.

- Mapping the Atari, revised edition, Ian Chadwick, Compute! books

publication, 1985.

 

 

Thanks to

~~~~~~~~~

- Nir Dary for the rev.2 source code, rom dumps and the 1200XL.

- Sijmen Schouten for his reconstructed 400/800 Rev.B source code.

- Stephen Sheppard for 400/800 Rev.A/NTSC information and rom dumps.

[Kr0tki]

0e86d61d is the correct checksum for the OSB NTSC OS.

 

The ROM with checksum 3e28a1fe isn't actually OSB PAL - its a patched version of OSB NTSC that was distributed together with the XFormer emulator, and it's believed to be taken from the Translator Disk, not from an actual Atari machine.

 

See also here, for info on how OSA/B checksums were computed by Atari themselves.