PCjs Machines
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IBM PC AT (Model 5170) ROM BIOS Sources
PCjs has created and archived a collection IBM PC AT ROM BIOS diskettes. Their contents are thanks to the PC DOS Retro website. Directory Listings and Version Notes are provided below.
[PCjs Machine "ibm5170-msdos320"]
Waiting for machine "ibm5170-msdos320" to load....
Directory of IBM PC AT BIOS Sources (V1)
Volume in drive A is 5170V1
Directory of A:\
5170V1 TXT 903 3-27-20 3:00p
ATLINK 151 3-27-20 3:00p
BIOS ASM 10150 3-27-20 3:00p
BIOS1 ASM 36439 3-27-20 3:00p
BIOS2 ASM 16874 3-27-20 3:00p
DISK ASM 35135 3-27-20 3:00p
DSEG SRC 9064 3-27-20 3:00p
DSKETTE ASM 50108 3-27-20 3:00p
EXE2BIN 77 3-27-20 3:00p
FILL ASM 123 3-27-20 3:00p
GDT_BLD ASM 2313 3-27-20 3:00p
IAPX286 MAC 4854 3-27-20 3:00p
KYBD ASM 24576 3-27-20 3:00p
ORGS ASM 25030 3-27-20 3:00p
POSTEQU SRC 14712 3-27-20 3:00p
PRT ASM 3856 3-27-20 3:00p
README TXT 3460 3-27-20 3:00p
RS232 ASM 6979 3-27-20 3:00p
SEGMENT SRC 28 3-27-20 3:00p
SIDT_BLD ASM 4935 3-27-20 3:00p
SYSDATA INC 3369 3-27-20 3:00p
SYSDATA MAC 1031 3-27-20 3:00p
SYSINIT1 ASM 2316 3-27-20 3:00p
TEST1 ASM 64948 3-27-20 3:00p
TEST2 ASM 53791 3-27-20 3:00p
TEST3 ASM 4385 3-27-20 3:00p
TEST4 ASM 8204 3-27-20 3:00p
TEST5 ASM 6487 3-27-20 3:00p
TEST6 ASM 14336 3-27-20 3:00p
TEST7 ASM 17478 3-27-20 3:00p
VERSIONS TXT 8490 3-27-20 3:00p
VIDEO1 ASM 59174 3-27-20 3:00p
32 file(s) 493776 bytes
712704 bytes free
Directory of IBM PC AT BIOS Sources (V2)
Volume in drive A is 5170V2
Directory of A:\
5170V2 TXT 803 3-27-20 3:00p
ATLINK 123 3-27-20 3:00p
BIOS ASM 7842 3-27-20 3:00p
BIOS1 ASM 45782 3-27-20 3:00p
BIOS2 ASM 22408 3-27-20 3:00p
DISK ASM 38284 3-27-20 3:00p
DSEG INC 7994 3-27-20 3:00p
DSKETTE ASM 71253 3-27-20 3:00p
EXE2BIN 81 3-27-20 3:00p
FILL ASM 123 3-27-20 3:00p
IAPX286 INC 1855 3-27-20 3:00p
KYBD ASM 30294 3-27-20 3:00p
ORGS ASM 34369 3-27-20 3:00p
POSTEQU INC 13474 3-27-20 3:00p
PRT ASM 5278 3-27-20 3:00p
README TXT 3460 3-27-20 3:00p
RS232 ASM 7981 3-27-20 3:00p
SYSDATA INC 3369 3-27-20 3:00p
TEST1 ASM 74982 3-27-20 3:00p
TEST2 ASM 56150 3-27-20 3:00p
TEST3 ASM 15698 3-27-20 3:00p
TEST4 ASM 24560 3-27-20 3:00p
TEST5 ASM 16263 3-27-20 3:00p
TEST6 ASM 12743 3-27-20 3:00p
VERSIONS TXT 8490 3-27-20 3:00p
VIDEO1 ASM 64799 3-27-20 3:00p
26 file(s) 568458 bytes
638976 bytes free
Directory of IBM PC AT BIOS Sources (V3)
Volume in drive A is 5170V3
Directory of A:\
5170V3 TXT 799 3-27-20 3:00p
ATLINK 123 3-27-20 3:00p
BIOS ASM 7842 3-27-20 3:00p
BIOS1 ASM 45791 3-27-20 3:00p
BIOS2 ASM 22408 3-27-20 3:00p
DISK ASM 38475 3-27-20 3:00p
DSEG INC 7994 3-27-20 3:00p
DSKETTE ASM 90867 3-27-20 3:00p
EXE2BIN 81 3-27-20 3:00p
FILL ASM 123 3-27-20 3:00p
IAPX286 INC 1855 3-27-20 3:00p
KYBD ASM 38104 3-27-20 3:00p
ORGS ASM 35847 3-27-20 3:00p
POSTEQU INC 14392 3-27-20 3:00p
PRT ASM 5345 3-27-20 3:00p
README TXT 3460 3-27-20 3:00p
RS232 ASM 8054 3-27-20 3:00p
SYSDATA INC 3369 3-27-20 3:00p
TEST1 ASM 75049 3-27-20 3:00p
TEST2 ASM 56221 3-27-20 3:00p
TEST3 ASM 15701 3-27-20 3:00p
TEST4 ASM 24580 3-27-20 3:00p
TEST5 ASM 16264 3-27-20 3:00p
TEST6 ASM 12743 3-27-20 3:00p
VERSIONS TXT 8490 3-27-20 3:00p
VIDEO1 ASM 65455 3-27-20 3:00p
26 file(s) 599432 bytes
607744 bytes free
5170V1 Notes (from PC DOS Retro)
IBM PC AT BIOS dated 01/10/84 based on the BIOS listings in the IBM PC AT Technical Reference dated March 1984.
The BIOS was originally built using IBM MASM 1.0.
Notes:
- FILL.ASM was added to properly link the BIOS, this defines the area between the end of the main BIOS code and the ORGS data at E000.
- IAPX286.MAC was derived based upon the generated code in the listings.
- The code at FF5A in ORGS.ASM is hidden from the BIOS listings with .XLIST.
- Using MASM 2.0, the code generated for line 1852 of TEST1.ASM will not match the original BIOS:
CMP WORD PTR ES:[DI],0FFFFH
MASM 1 generates: 26 81 3D FF FF
MASM 2 generates: 26 83 3D FF
Additional files:
FILL.ASM - see above
ATLINK - linker response file
EXE2BIN - DEBUG script to convert the EXE file to a BIN file
Steps to build the PC AT BIOS:
for %a in (*.asm) do masm %a;
link @atlink
debug < exe2bin
5170V2 Notes (from PC DOS Retro)
IBM PC AT BIOS dated 06/10/85 based on the BIOS listings in the IBM PC AT Technical Reference dated September 1985.
The BIOS was originally built using IBM MASM 2.0.
Notes:
- FILL.ASM was added to properly link the BIOS, this defines the area between the end of the main BIOS code and the ORGS data at E000.
- IAPX286.INC was derived based upon the generated code in the listings.
- In TEST1.ASM there is an invalid POP instruction with no operands which MASM 2.0 assembles as PUSH 0.
- The code at FF5A in ORGS.ASM is hidden from the BIOS listings with .XLIST.
Additional files:
FILL.ASM - see above
ATLINK - linker response file
EXE2BIN - DEBUG script to convert the EXE file to a BIN file
Steps to build the PC AT BIOS:
for %a in (*.asm) do masm %a;
link @atlink
debug < exe2bin
5170V3 Notes (from PC DOS Retro)
IBM PC AT BIOS dated 11/15/85 based on the BIOS listings in the IBM PC AT Technical Reference dated March 1986.
The BIOS was originally built using IBM MASM 2.0.
Notes:
- FILL.ASM was added to properly link the BIOS, this defines the area between the end of the main BIOS code and the ORGS data at E000.
- IAPX286.INC was derived based upon the generated code in the listings.
- In TEST1.ASM there is an invalid POP instruction with no operands which MASM 2.0 assembles as PUSH 0.
- The code at FF5A in ORGS.ASM is hidden from the BIOS listings with .XLIST.
Additional files:
FILL.ASM - see above
ATLINK - linker response file
EXE2BIN - DEBUG script to convert the EXE file to a BIN file
Steps to build the PC AT BIOS:
for %a in (*.asm) do masm %a;
link @atlink
debug < exe2bin