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IBM PS/2 System ROM Images

All ROM images are individually zipped to make file corruption easy to detect.

Direct access to the ROM image directory HERE.

ROM images dumped by David Beem, Louis Ohland, Tim Clarke, and others.
List created by Tomáš Slavotínek. Last update: 25 Nov 2024

Sticker P/N ROM Images ¹⁾	Internal P/N	Machine Model Planar/Complex Type	BIOS		Memory Device(s)			Notes
Sticker P/N ROM Images ¹⁾	Internal P/N	Machine Model Planar/Complex Type	Date	Rev.	Size	Type	Position	Notes
Model 25 [Type 8525]
00F2092 / 00F2093	00F2092 / 00F2093	25 (8086)	26 Jun 1987	0	2×32K	27256	U17 / U20	typically on Type 1 planar
00F2122 / 00F2123	00F2122 / 00F2123	25 (8086)	26 Jun 1987	0	2×32K	27256	U17 / U20	typically on Type 2 planar

For Model 25-286 ROMs see the Model 30 section below.

87F4794	87F4794 (96F7492 / 96F7493)	25 SX	09 Jan 1992	11h	1×128K	27C1024-150	U26
Model 30 [Type 8530]
68X1687 / 68X1627	68X1645 / 68X1693	30 (8086)	02 Sep 1986	0	2×32K	27256	U17 / U20	earliest known ISA PS/2 FW
61X8938 / 61X8937	61X8938 / 61X8937	30 (8086)	12 Dec 1986	1	2×32K	27256	U17 / U20
61X8940 / 61X8939	61X8940 / 61X8939	30 (8086)	05 Feb 1987	2	2×32K	27256	U17 / U20
33F4498 / 33F4499	33F4498 / 33F4499	30 (8086)	31 Jan 1989	4	2×32K	27256	U17 / U20

30F9580 / 30F9579	30F9580 / 30F9579	25-286 & 30-286 (Old)	25 Aug 1988	0	2×64K	27C512	ZM11 / ZM12
27F4092	30F9580 / 30F9579	25-286 & 30-286 (New)	25 Aug 1988	0	1×128K	TC531024P-15	ZM46	same as above, only combined
33F5381	33F5540 (57F1144 / 57F1145)	25-286 & 30-286 (New)	28 Jun 1989	2	1×128K	TC531024P-15	ZM46
33F5540	same contents as above
Model 35 SX and 40 SX [Type 8535 and 8540]
92F1502 / 92F1503	92F1500 / 92F1501	35 SX & 40 SX	04 Apr 1991	6	2×64K	27C512	U19 / U31
04G2022 / 04G2021	04G2020 / 04G2019	35 SX & 40 SX	25 Sep 1991	10h	2×64K	27C512	U19 / U31
10G4128 / 10G4127	Unknown	35 SX & 40 SX	14 Mar 1992*	Unk.	2×64K?	27C512?	U19 / U31	* one sticker says 14/03/92 (even) the other 12/03/92 (odd)
Model L40 SX [Type 8543]
95F4981	95F4981	L40 SX	27 Feb 1991	2	1×128K	27C010-200 ⁴⁾	U59 or U82	labeled "ER107"
95F6766	95F6766	L40 SX	26 Aug 1991	3	1×128K	27C010-200 ⁴⁾	U59 or U82
95F6768 ?	95F6768	L40 SX	13 Nov 1991	3	1×128K	27C010-200 ⁴⁾	U59 or U82	4 bytes had to be fixed manually
Model 50 / 50Z [Type 8550]
90X6816 / 90X6817 90X6815 / 90X6818 ²⁾	90X6816 / 90X6817 90X6815 / 90X6818 ²⁾	50	13 Feb 1987	0	4×32K	27256	ZM14 / ZM15 ZM13 / ZM16	same as Model 60 rev. 0 earliest known MCA PS/2 FW
90X7423 / 90X7426 90X7420 / 90X7429 ²⁾	same contents as above
Unknown	Unknown	50	09 May 1987	1	4×32K	27256	ZM14 / ZM15 ZM13 / ZM16

Unknown	Unknown	50Z	28 Feb 1988	2	2×64K	27512	ZM6 / ZM5
15F8366 / 15F8365	15F8366 / 15F8365	50Z	18 Apr 1988	3	2×64K	27512	ZM6 / ZM5
15F8362 / 15F8361	same contents as above
Model N51 SX / N51 SLC [Type 8551]
95F3744	95F3744	N51 SX	07 Mar 1992	4	1×128K	27C010	U19
49G2752	49G2752	N51 SX	18 Jun 1992	5	1×128K	27C010	U19

35G4645	35G4645	N51 SLC	15 Apr 1992	1	1×128K	27C010	U23
Model 55 SX / 55 LS [Type 8555]
33F8146 / 33F8145	33F8152 / 33F8153	55 SX	02 Nov 1988	0	2×64K	27C512	ZM41 / ZM40 or ZM44 / ZM43
92F0626 / 92F0627	same contents as above
33F8102 / 33F8103	33F8172 / 33F8171	55 SX	07 Jan 1989	1	2×64K	27C512	ZM41 / ZM40 or ZM44 / ZM43

84F6896 / 84F6897	84F6896 / 84F6897	55 LS	08 Feb 1990	0	2×64K	27C512	ZM41 / ZM40	requires ext. NVRAM (ZM33) same date as Model 65 SX rev. 0
84F7048 / 84F7047	84F7048 / 84F7047	55 LS	17 Aug 1990	0	2×64K	27C512	ZM41 / ZM40	requires ext. NVRAM (ZM33) same as above except for date, P/N & sum
Model 56 / 57 SX [Type 8556 and 8557]
92F1600	Unknown	56 / 57 SX	Unknown	Unk.	1×128K?	27C2048-150	U55
10G5029	10G5030	56 / 57 SX	07 Dec 1991	9	1×128K?	27C2048-150	U55
Model 56 / 57 SLC2/3 [Type 9556 and 9557]
39G2151	Unknown	56 / 57 SLC2/3	Unknown	Unk.	1×128K?	27C2048-150	U64	SLC2?
65G8608	71G3580	56 / 57 SLC2/3	29 Jul 1993	4	1×128K?	27C2048-150	U64	SLC3 only?
Model 60 [Type 8560]
90X6816 / 90X6817 90X6815 / 90X6818 ²⁾	90X6816 / 90X6817 90X6815 / 90X6818 ²⁾	60	13 Feb 1987	0	4×32K	27256	ZM101 / ZM111 ZM116 / ZM118	same as Model 50 rev. 0 earliest known MCA PS/2 FW
90X7423 / 90X7426 90X7420 / 90X7429 ²⁾	same contents as above
Model 65 SX [Type 8565]
64F3608 / 64F3611	64F3610 / 64F3613	65 SX	08 Feb 1990	0	2×64K	27C512	U90 / U91	same date as Model 55 LS rev. 0
Model 70 [Type 8570]
15F8302 / 15F8303	15F8306 / 15F8307	70 16 MHz (Long, Type 1)	11 Apr 1988	2 / 0*	2×64K	D27512-2	U170 / U169	* rev. 2 for Model 70 (16/20 MHz), rev. 0 for Model 80 (20 MHz)

33F4906	33F4907	70 20 MHz (Short, Type 2)	12 May 1988	3	1×128K	TC571001D-20 or Am27C100	U10	incomplete dump!
64F3513	64F3506	70 20 MHz (Short, Type 2)	15 Dec 1989	4	1×128K	TC571001D-20 or Am27C100	U10

33F9988 / 33F9987	33F9986 / 33F9985	70 386 25 MHz (-Axx, Type 3)	20 Feb 1989	1	2×64K	27C512-175	U58 / U57

64F3126 / 64F3125	64F3126 / 64F3125	70 486 25 MHz (-Bxx, Type 4)	01 Dec 1989	0	2×64K	27C512-175	U58 / U57
Model P70 [Type 8573]
38F5957 / 38F5958	38F5957 / 38F5958	P70 16 MHz (Old)	07 Feb 1989	0	2×64K	D27512-200	not marked (right / left)	board w/ swapped ROM stickers spotted (1 out of 3 samples so far)
65X1566 / 65X1565	65X1566 / 65X1565	P70 20 MHz (Old)	18 Jan 1989	0	2×64K	D27512-200	not marked (right / left)

56F7439	56F7439	P70 16 & 20 MHz (New)	16 Dec 1989	1 / 2*	1×128K	HN27C301G-20	not marked	* rev. 1 for 16 MHz, rev. 2 for 20 MHz
Model 76 / 77 [Types 9576 and 9577]
39G3299	39G3300	76/77 (Bermuda)	03 Aug 1992	3	1×128K	27C1001	U65
Model 80 [Type 8580]
72X7550 / 72X7553 72X7556 / 72X7559 ³⁾	72X7551 / 72X7554 72X7557 / 72X7560 ³⁾	80 16 MHz (Type 1)	30 Mar 1987	0	4×32K	27C256-120	U52 / U53 U54 / U55
90X8548 / 90X8549 90X8550 / 90X8551 ³⁾	same contents as above

15F6597 / 15F6600	15F6597 / 15F6600	80 20 MHz (Type 2)	07 Oct 1987	0	2×64K	27C512	U157 / U158
15F6637 / 15F6639	same contents as above

64F3084 / 64F3085	64F3088 / 64F3089	80 25 MHz (Type 3)	21 Nov 1989	1	2×64K	27C512-1JL	U140 / U141
64F4356 / 64F4355	64F4356 / 64F4355	80 25 MHz (Type 3)	15 Feb 1990	2	2×64K	27C512-1JL	U140 / U141
Model 90 / 95 / 5560 Processor Complexes [Types 8590, 9590, 8595, 9595, 5560]
57F2943	57F2995	Type 0-	19 Aug 1989	0	1×256K*	27C020-200	U49	* Stage 2 POST in ROM
84F9413	84F9413	Type 0	01 Aug 1990	0	1×128K	27C010-150	U21

64F4474	64F4474	Type 1 ("J" w/ Weitek)	24 Apr 1990	0	1×128K	27C010	U36
84F9154	84F9154	Type 1 (Weitek or "SOD" pads)	18 Jun 1990	0	1×128K	27C010	U36
84F9155	Unknown	Type 1 ("J" or "K" w/ Weitek)	Unknown	Unk.	1×128K	27C010	U36
91F9812	91F9812	Type 1 (non-"SOD")	09 Jan 1991	1	1×128K	27C010	U36 or U44
52G9509	10G7222	Type 1 (any but Upg-66)	03 Mar 1992	3	1×128K	27C010	U36 or U44	"Dual Booting Capability EPROM"
79F0181	79F0181	Type 1 (5561-W0x)	28 Aug 1990	0	1×128K	27C010	U13	Japanese

07G0463	07G0463	Type 2 (early "H")	08 Aug 1991	0	1×128K	27C010	U7
41G9361	41G9361	Type 2 ("H" or "L")	03 Mar 1992	3	1×128K	27C010	U7

35G2957	35G2957	Type 2 — 5560-Nxx / Upg-B	08 Jun 1992	2	1×128K	27C010	U7	5560 planar only

41G9251	Unknown	Type 3	Unknown	Unk.	Unk.	Unknown	U27
52G9619	52G7740	Type 3	18 Mar 1992	0	1×256K*	27C201	U27	* 128K image stored twice or chip incorrectly identified
ThinkPad 700 / 720 [Type 9552]
39G9996	39G9996	ThinkPad 700	03 Sep 1992	42h	1×256K	27C201	U16
"Gearbox" [Type 7552]
16F2288 / 16F2289	16F2288 / 16F2289	"Gearbox"	28 Aug 1987	1	2×32K	27256	U25 / U6	"UER 3.0"
16F1972 / 16F1971	16F1972 / 16F1971	"Gearbox"	16 Aug 1988	2	2×32K	27256	U25 / U6	"UER 3.1"
"Gearbox 800" [Type 7568]
91F8150	91F8150	"Gearbox 800" (C40)	21 Jun 1991	0	1×128K	27C010-200	U1
10G7021	10G7021	"Gearbox 800" (D40)	07 Jun 1992	10h	1×128K	27C010-200	U1
Remote Control Unit [Type 5494]
03F0312 / 03F0313	02F9518 / 02F9653	Remote Control Unit	28 Jan 1992	19h	2×64K	27C512	U77 / U78	bad checksum?

Notes:

The order of the split image files is:
   even (low) / odd (high)
The even ROM is connected to the low eight bits of the data bus and contains even bytes (0, 2, 4...)
   Significant bytes: FFF8h: jmp instr. (EAh), FFFFh: machine model (F8h or FCh)
The odd ROM is connected to the high eight bits of the data bus and contains odd bytes (1, 3, 5...)
   Significant bytes: FFFFh: segment checksum byte
ROMs that are part of the same even / odd pair are read concurrently (at the same time).
To the system this configuration appears as a single 16-bit wide ROM chip.
ROM subsytem consisting of 4 memory chips and a 16-bit data bus. Image order:
even / odd (seg. #1)
even / odd (seg. #2)
ROM subsytem consisting of 4 memory chips and a 32-bit data bus. Image order:
even #1 / odd #1 (low word)
even #2 / odd #2 (high word)

Content created and/or collected by:
Louis F. Ohland, Peter H. Wendt, David L. Beem, William R. Walsh, Tatsuo Sunagawa, Tomáš Slavotínek, Jim Shorney, Tim N. Clarke, Kevin Bowling, and many others.

Ardent Tool of Capitalism is maintained by Tomáš Slavotínek.
Last update: 03 Dec 2024 - Changelog | About | Legal & Contact