133 lines
6.4 KiB
Markdown
133 lines
6.4 KiB
Markdown
---
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layout: page
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title: IBM PC AT (Model 5170) ROMs
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permalink: /devices/pcx86/rom/5170/
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redirect_from:
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- /devices/pc/5170/
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- /devices/pc/bios/5170/
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- /devices/pc/rom/5170/bios/
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- /devices/pc/rom/5170/
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---
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IBM PC AT (Model 5170) ROM Revisions
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---
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There were three ROM BIOS revisions for the IBM PC AT, which we refer to as **[Rev 1](#ibm-pc-at-rom-bios-rev-1)**,
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**[Rev 2](#ibm-pc-at-rom-bios-rev-2)**, and **[Rev 3](#ibm-pc-at-rom-bios-rev-3)**. Each revision was used with a
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corresponding motherboard type (**Type 1**, **Type 2**, and **Type 3**, respectively), which in turn were used with
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corresponding 5170 models ([Models 68 and 99](/devices/pcx86/machine/5170/#models-68-and-99),
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[Model 239](/devices/pcx86/machine/5170/#model-239), and
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[Models 319 and 339](/devices/pcx86/machine/5170/#models-319-and-339), respectively).
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IBM PC AT ROM BIOS (Rev 1)
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---
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[ATBIOS-REV1.json](1984-01-10/ATBIOS-REV1.json) contains the original IBM PC AT BIOS, dated January 10, 1984
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("01/10/84"). It was produced for [5170 Models 68 and 99](/devices/pcx86/machine/5170/#models-68-and-99),
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announced August 14, 1984.
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Do we really think this PC AT BIOS was "finalized" a full 7 months before the PC AT was even announced, let alone
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available? I doubt it. I suspect the BIOS date string was simply never updated to reflect the date of the final
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change(s).
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From [http://minuszerodegrees.net/bios/BIOS_5170_10JAN84_6MHZ.zip](http://minuszerodegrees.net/bios/):
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This is the first BIOS for the IBM 5170.
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It is dated 10JAN84.
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It is found in type 1 motherboards running at 6 Mhz.
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U27 has the IBM part number of 6181028, and is 32K in size
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U47 has the IBM part number of 6181029, and is 32K in size
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8 bit checksum of 6181028 = 36
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8 bit checksum of 6181029 = CA
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--
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added = 00
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There are two BIN files in this ZIP file:
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1. BIOS_5170_10JAN84_U27_6181028_27256_6MHZ.BIN --> Use this to create a U27 using a 27256 EPROM (rated at 150nS or faster)
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2. BIOS_5170_10JAN84_U47_6181029_27256_6MHZ.BIN --> Use this to create a U47 using a 27256 EPROM (rated at 150nS or faster)
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The JSON-encoded ROM image that PCjs uses was created using the *FileDump* command-line *merge* option:
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filedump --file=http://archive.pcjs.org/devices/pcx86/rom/5170/BIOS_5170_10JAN84_U27_6181028_27256_6MHZ.BIN --merge=http://archive.pcjs.org/devices/pcx86/rom/5170/BIOS_5170_10JAN84_U47_6181029_27256_6MHZ.BIN --output=ATBIOS-REV1.json --overwrite
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Since a MAP file ([ATBIOS-REV1.map](1984-01-10/ATBIOS-REV1.map)) exists as well, it is automatically appended to the JSON file
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([ATBIOS-REV1.json](1984-01-10/ATBIOS-REV1.json)) when using a ROM input file (or JSON output file) with a matching filename.
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It is also possible to create a merged binary ROM image ([ATBIOS-REV1.rom](http://archive.pcjs.org/devices/pcx86/rom/5170/ATBIOS-REV1.rom))
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by adding *--format=rom* to the command-line (the default is *--format=json*).
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These operations can only be performed using the *FileDump* command-line interface; the *FileDump* API does not support
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either the *merge* option or the appending of MAP data. For the moment, the API can only dump unadorned ROM images; eg:
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http://localhost:8088/api/v1/dump/?file=http://archive.pcjs.org/devices/pcx86/rom/5170/ATBIOS-REV1.rom
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---
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IBM PC AT ROM BIOS (Rev 2)
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---
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[ATBIOS-REV2.json](1985-06-10/ATBIOS-REV2.json) contains the second IBM PC AT BIOS, dated June 10, 1985.
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This BIOS was produced for [5170 Model 239](/devices/pcx86/machine/5170/#model-239), announced October 10,
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1985. It increased the number of supported hard disk types from 15 to 23, fixed some bugs, and added support for 720Kb
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3.5-inch floppy diskette drives.
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From [http://minuszerodegrees.net/bios/BIOS_5170_10JUN85_6MHZ.zip](http://minuszerodegrees.net/bios/):
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This is the second BIOS for the IBM 5170.
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It is dated 10JUN85.
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It is found in type 2 motherboards running at 6 Mhz.
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U27 has the IBM part number of 6480090, and is 32K in size
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U47 has the IBM part number of 6480091, and is 32K in size
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8 bit checksum of 6480090 = 71
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8 bit checksum of 6480091 = 8F
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--
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added = 00
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There are two BIN files in this ZIP file:
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1. BIOS_5170_10JUN85_U27_6480090_27256.BIN --> Use this to create a U27 using a 27256 EPROM (rated at 150nS or faster)
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2. BIOS_5170_10JUN85_U47_6480091_27256.BIN --> Use this to create a U47 using a 27256 EPROM (rated at 150nS or faster)
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The JSON-encoded ROM image that PCjs uses was created using the *FileDump* command-line *merge* option:
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filedump --file=http://archive.pcjs.org/devices/pcx86/rom/5170/BIOS_5170_10JUN85_U27_6480090_27256.BIN --merge=http://archive.pcjs.org/devices/pcx86/rom/5170/BIOS_5170_10JUN85_U47_6480091_27256.BIN --output=ATBIOS-REV2.json --overwrite
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---
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IBM PC AT ROM BIOS (Rev 3)
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---
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[ATBIOS-REV3.json](1985-11-15/ATBIOS-REV3.json) contains the third (and last) IBM PC AT BIOS, dated November 15, 1985.
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This BIOS was produced for [5170 Models 319 and 339](/devices/pcx86/machine/5170/#models-319-and-339),
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announced April 2, 1986. It added support for 101-key keyboards and 1.44Mb 3.5-inch floppy diskette drives.
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Note that, although minuszerodegrees.net says this revision was found in "type 2 motherboards running at 8 Mhz",
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the [Vintage Computer Federation](http://www.vcfed.org/forum/showthread.php?26480) refers to the 8Mhz motherboards as
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"Type 3".
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From [http://minuszerodegrees.net/bios/BIOS_5170_15NOV85_8MHZ_VARIATION_2.zip](http://minuszerodegrees.net/bios/):
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This is the third BIOS for the IBM 5170.
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It is dated 15NOV85.
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It is found in type 2 motherboards running at 8 Mhz.
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U27 has the IBM part number of 61X9266, and is 32K in size
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U47 has the IBM part number of 61X9265, and is 32K in size
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8 bit checksum of 61X9266 = 10
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8 bit checksum of 61X9265 = F0
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--
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added = 00
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There are two BIN files in this ZIP file:
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1. BIOS_5170_15NOV85_U27_61X9266_27256.BIN --> Use this to create a U27 using a 27256 EPROM (rated at 150nS or faster)
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2. BIOS_5170_15NOV85_U47_61X9265_27256.BIN --> Use this to create a U47 using a 27256 EPROM (rated at 150nS or faster)
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The JSON-encoded ROM image that PCjs uses was created using the *FileDump* command-line *merge* option:
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filedump --file=http://archive.pcjs.org/devices/pcx86/rom/5170/BIOS_5170_15NOV85_U27_61X9266_27256.BIN --merge=http://archive.pcjs.org/devices/pcx86/rom/5170/BIOS_5170_15NOV85_U47_61X9265_27256.BIN --output=ATBIOS-REV3.json --overwrite
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