HP Calculator Chips

part number	models	description	vendor(s)	notes
00031-80008	31E, 32E, 33E, 37E	RAM		markings "0031 A0008SGB" in 33E, "0031 B0008SGB" in 31E replaced by 00031-80012 in 32E
00031-80012	32E	RAM
00048-80063	48G/GX, 38G, 39G, 40G, 49G	Saturn processor (Yorke)	NEC D3004GD
00065-60218	65	hybrid (ARC, CTC, RAM, program store, clock driver, CRC)	HP
00080-60106	80	ROM hybrid, seven 256*10 chips	HP	replaced by 1813-0024?
1130-0536	10, 19C	Sting series LED display module
1810-0146	55, 65	quad inductor hybrid
1810-0147	55, 65	quad inductor hybrid
1810-0236	10, 19C, 91, 92, 95C, 97	hybrid circuit for motor speed control
1810-0252	92	3K resistor network for display
1813-0024	80	ROM hybrid, seven 256*10 chips	HP	replaced by 1818-0076 and 1818-0077
1818-0006	35	ROM, 256*10	AMI	early buggy release, with -0017 and -0020
1818-0011	45	ARC	Mostek MK6020P	replaced by 1820-0848
1818-0012	35, 80	CTC	AMI, Mostek MK6021	replaced by 1818-0078
1818-0017	35	ROM, 256*10	AMI	early buggy release, with -0006 and -0020
1818-0020	35	ROM, 256*10	AMI	early buggy release, with -0006 and -0017
1818-0024	35	ROM, 256*10	AMI
1818-0026	35	ROM, 256*10	AMI, Mostek MK6024L
1818-0027	35	ROM, 256*10	AMI	replaced by 1818-0028?
1818-0028	35	ROM, 256*10		replaces 1818-0027?
1818-0057	45	ROM, 1024*10	AMI
1818-0058	46	ROM, 1024*10	AMI
1818-0059	46	ROM, 1024*10	AMI
1818-0067	81	ROM, 1024*10	AMI
1818-0068	46, 81	ROM, 1024*10	AMI
1818-0069	81	ROM, 1024*10	AMI
1818-0070	81	ROM, 1024*10	AMI
1818-0071	81	ROM, 1024*10	AMI
1818-0072	81	ROM, 1024*10	AMI
1818-0073	65	ROM, 1024*10	Mostek MK6111P
1818-0074	65	ROM, 1024*10	Mostek MK6112P
1818-0075	65	ROM, 1024*10	Mostek MK6113P
1818-0076	80	ROM, 1024*10		replaces 1813-0024
1818-0077	80	ROM, 1024*10		replaces 1813-0024
1818-0078	35, 45, 55, 70, 80	CTC	AMI, Mostek MK6021P
1818-0082	45	ROM, 1024*10	AMI	replaces ???
1818-0116	70	ROM, 1024*10	AMI
1818-0117	70	ROM, 1024*10	AMI
1818-0118	55	ROM, 1024*10	Mostek MK6134P
1818-0119	55	ROM, 1024*10	AMI
1818-0120	55	ROM, 1024*10	AMI
1818-0129	21	ROM/anode driver	AMI, Mostek
1818-0153	25	ROM/anode driver	AMI, Mostek	replaced by 1818-0168
1818-0154	25, 25C	ROM	AMI, Mostek MK60126N
1818-0163	22	ROM/anode driver	AMI
1818-0164	22	ROM	AMI
1818-0168	25, 25C	ROM/anode driver	AMI	replaces 1818-0153
1818-0190	91	ROM/anode driver	AMI
1818-0191	91	ROM/anode driver	AMI
1818-0192	91	ROM/anode driver	AMI
1818-0225	97	ROM/anode driver		not compatible with AMI ACT (1820-1596), replaced by 1818-0267
1818-0226	67, 97	ROM/RAM	Mostek MK60172N	replaced by 1818-0551
1818-0227	67	ROM/anode driver	Mostek MK60033N	replaced by 1818-0268
1818-0228	67, 97	ROM/RAM	Mostek MK60171N	replaced by 1818-0550
1818-0229	97	ROM/RAM
1818-0230	97	ROM/RAM
1818-0231	67	ROM/RAM	Mostek MK60176N
1818-0232	67	ROM/RAM	Mostek MK60175N
1818-0233	97	ROM
1818-0267	97	ROM/anode driver		replaces 1818-0225
1818-0268	67	ROM/anode driver	Mostek MK60038N	replaces 1818-0227
1818-0290	95C	ROM
1818-0291	95C	ROM
1818-0295	95C	ROM
1818-0296	95C	ROM
1818-0297	95C	ROM/anode driver
1818-0345	92	ROM/anode driver	Mostek MK60040N
1818-0346	92	ROM/RAM	Mostek MK60181N
1818-0347	92	ROM/RAM	Mostek MK60182N
1818-0349	92	ROM/RAM	Mostek MK60183N
1818-0350	92	ROM	AMI
1818-0351	92	ROM/RAM	Mostek MK60184N
1818-0376	19C, 29C	ROM	AMI
1818-0377	19C, 29C	ROM	AMI, Mostek
1818-0378	29C	ROM/anode driver		replaced by 1818-0431
1818-0379	19C, 29C	ROM/RAM	AMI, Mostek MK60185
1818-0387	19C	ROM	Mostek MK60142N
1818-0431	29C	ROM/anode driver	AMI	replaces 1818-0378
1818-0432	19C	ROM/anode driver	Mostek	replaces ???
1818-0498	82938A	2716 EPROM	Intel	Series-80 HP-IL interface firmware
1818-0550	67, 97	ROM/RAM		fixes trig bugs, replaces 1818-0228
1818-0551	67, 97	ROM/RAM		fixes trig bugs, replaces 1818-0226
1818-1396	85	16K DRAM		(U9 through U19, CRT assembly U13 through U16) - industry standard 4116?
1818-1886	82909A	64K DRAM	Hitachi HM4864P-3
1820-0848	35, 45, 46, 80, 81	ARC	AMI	replaced by 1820-1169
1820-0849	35	CTC	AMI
1820-0853	35	anode driver
1820-0854	35, 80	cathode driver
1820-0855	35, 80	clock driver		8 pin DIP, only marked "0855", requires external clamp diodes, replaced by 1820-1127
1820-0993	45, 46, 70 , 81	RAM, 10*56	Mostek MK6036P	replaced by 1820-1393
1820-0994	46, 81	printer driver
1820-1029	35, 45, 46, 55, 65, 80, 81	anode driver
1820-1061	35, 45, 46, 81	cathode driver		replaced by 1820-1226
1820-1127	35, 46, 80, 81	clock driver		8 pin DIP, only marked "1127", doesn't require external clamp diodes, replaces 1820-0855
1820-1128	35, 45, 55, 70, 80	clock driver and reset, 16 pin DIP
1820-1169	35, 45, 55, 70, 80	ARC	AMI, Mostek MK6020P
1820-1226	35, 55	cathode driver
1820-1382	21, 22, 25, 25C, 27, 29C	cathode driver	HP
1820-1393	55	RAM, 10*56	Mostek MK6036P
1820-1396	21	ACT	AMI	replaced by 1820-1523
1820-1523	21, 22, 25, 25C	ACT	AMI, Mostek MK6215N, MK6215P
1820-1564	22, 25, 91	RAM, 8*56	AMI, Mostek MK6220N
1820-1596	21, 22, 25, 29C, 67, 91, 92, 95C, 97	ACT	AMI, Mostek MK6216N
1820-1629	19C, 91, 92, 95C, 97	cathode driver
1820-1630	25C	RAM, 8*56, static	Synertek	replaced by 1820-1843
1820-1680	91	PIK	Mostek MK62181N
1820-1723	19C, 97	PIK		replaced by 1820-1952
1820-1741	21, 22, 25, 25C, 29C	ACT	AMI, Mostek MK6217N
1820-1749	67	cathode driver
1820-1751	67, 97	CRC	Mostek MK6250N
1820-1812	67, 97	ACT	Mostek MK6218N	replaced by 1820-1596 or 1820-2530
1820-1843	25C	RAM, 8*56, static	Synertek
1820-1886	25C, 95C	RAM, 16*56, static	AMI	double the density of the 1820-1843. replaced by 5061-0469
1820-1895	95C	PIK
1820-1896	92	PIK	Mostek MK62182A
1820-1952	19C, 97	PIK		replaces 1820-1723
1820-1983	29C, 22, 25, 25C	power-on reset, battery low comparator	AMD	8-pin DIP
1820-2028	19C, 67	ACT	AMI
1820-2105	33E	processor
1820-2105-A	31E	processor		replaced by 1820-2105-B
1820-2105-B	31E, 33C	processor		replaced by 1MA4-0001
1820-2122	37E	processor
1820-2122-A	38E	processor
1820-2162	34C, 38C, 32E	processor	AMI
1820-2162-A	34C, 38C, 32E	processor	AMI
1820-2271	82938A	8039 microprocessor
1820-2291	82950A	unknown 24-pin, modem?	Motorola
1820-2298	82900A	MK3880N-4 (Z-80 CPU, 4 MHz)	Mostek
1820-2424	82937A	HP-IB buffer, 24 pin	Motorola
1820-2437	82937A	8049 microcontroller, HP-IB interface	Intel
1820-2438	82939A, 82950A	8049 microcontroller, serial interface/modem	Intel
1820-2443	82939A	INS8250 UART	National Semiconductor
1820-2530	67, 97	ACT
1820-2531	82950A	unknown 40-pin, UART? possibly 16450	National Semiconductor
1820-2673	82161A	3870 microcontroller, HP-IL tape drive
1820-2704	82162A	3870 series microcontroller, HP-IL thermal printer
1820-2737	82163A	8048 microcontroller, HP-IL video interface
1820-2771	82905	3870 series microcontroller, HP-IL dot matrix printer (Epson MX-80)
1820-2809	82165A	3870 microcontroller, HP-IL to GPIO converter
1820-2810	82166A, 82166C	3870 microcontroller, HP-IL to GPIO converter
1820-3084	82169A	8048 microcontroller, HP-IL to HP-IB converter
1820-3218	82164A	8048 microcontroller, HP-IL to RS-232 converter
1820-6519	82440B	M80C50-253 microcontroller, IR printer	OKI
1826-0158	65	card reader sense amplifier
1826-0180	82143A	NE555 timer (unconfirmed)
1826-0287	19C, 97	printer-related
1826-0322	67, 97, 82104A	card reader sense amplifier
1826-0566	41C	power supply		replaced by 1826-0953
1826-0953	41C	power supply		replaces 1826-0566
1858-0044	19C, 91, 97	quad NPN transistor, TPQ3904? used as anode drivers and printhead drivers
1858-0050	67	CA3082 NPN 7-transistor array	RCA
1990-0335	67	five-digit LED display module		replaced by 5082-7405
1990-0495	21, 22, 25, 25C, 27	Woodstock series LED display module
1990-0559	29C	Woodstock series LED display module
1990-0657	3xE, 3xC	Spice series LED display module
5061-0428	27	ACT, NMOS
5061-0430	27	2K*10 ROM/anode driver, NMOS
5061-0459	27	1K*10 ROM / 16*56 RAM, 16*56, NMOS
5061-0466	27	ACT, NMOS
5061-0469	19C, 25C, 29C, 95C	RAM, 16*56, CMOS static	HP	replaces 1820-1886
5061-0474	10	CPU/ROM/RAM/display driver/printer control
5061-7255	41C	HP-41CV halfnut display/ROM/RAM hybrid
5061-7285		HP-41 Advantage ROM version A
5061-7292		HP-41 Advantage ROM version B
5082-7405	67	five-digit LED display module		replaces 1990-0335
1LA2-0001	82104A	CRC
1LA3		Nut ROM, 4K*10		replaced by 1LE9
1LA3-0015	41C	ROM 0
1LA3-0016	41C	ROM 1
1LA3-0022	41C	ROM 2
1LA3-0033	41C	ROM 0
1LA4	41C	display driver
1LA5-0001	41C	Nut CPU		replaced by 1LE3-002, 1LF5-0002
1LA7	41C, 41CV	Nut RAM, 16*56
1LA7-0001	41C, 41CV	RAM, 16*56		status registers
1LA7-0002	41C
1LA7-0003	41C
1LA7-0004	41C
1LA7-0005	41C
1LB3-0003	many HP-IL	HP-IL interface chip, microcontroller interface		replaced by 1LR4-0002
1LB3-0303	75C, 75D	HP-IL interface chip, HP-75 bus interface
1LB4	82143A	NPIC interface chip (for 41C)
1LB6	82160A	HP-IL interface chip (for 41C)
1LB7-0001	41C, 41CV	ROM 0
1LB7-0002	41C, 41CV	ROM 1
1LB7-0003	41C, 41CV	ROM 2
1LB7-0030	82104A	card reader ROM
1LB7-0038	41C, 41CV	ROM 0
1LB7-0039	41C, 41CV	ROM 1
1LB7-0040	41C, 41CV	ROM 2
1LB7-0050	82104A	card reader ROM
1LB9-0001	33C	CMOS ROM/RAM
1LB9-0002	34C	CMOS ROM/RAM
1LB9-0003	38C	CMOS ROM/RAM
1LD2	75C	clock/keyboard
1LD3	75C	card reader
1LD4	75C	ROM
1LD7	75C	display driver
1LE2	1xC	R2D2: Voyager 6K*10 ROM/43*56 RAM/display driver
1LE2-0308	12C	RAM/ROM/display driver
1LE2-0321	15C	RAM/ROM/display driver
1LE2-0322	16C	RAM/ROM/display driver
1LE3-0002	41C, 41CV	Nut CPU		replaced by 1LF5-0002
1LE4	75C	Capricorn CPU
1LE5-0002	75C	address register
1LE6	75C	bus buffer
1LE7-0001	41C/CV/CX	RAM, 64*56		replaced by 1LH5-0001
1LE7-0002	41CV/CX	RAM, 64*56		replaced by 1LH5-0002
1LE7-0003	41CV/CX	RAM, 64*56		replaced by 1LH5-0003
1LE7-0004	41CV/CX	RAM, 64*56		replaced by 1LH5-0004
1LE7-0005	41CV/CX	RAM, 64*56
1LE7-0006	41CX	RAM, 64*56
1LE7-0007	41CX	RAM, 64*56		replaced by 1LH5-0007
1LE9		ROM, 4K*10		replaces 1LA3
1LE9-0006	41C/41CV	ROM 0 rev G
1LE9-0007	41C/41CV	ROM 1 rev F
1LE9-0008	41C/41CV	ROM 2 rev F
1LF1	75C	display controller
1LF2-0001	71B	Saturn CPU		replaced by 1LK7
1LF3	71B	display
1LF4-0001	82163A	video chip
1LF5-0002	41C	Nut CPU		relaces 1LA5-0001
1LF5-0003	41C	Halfnut CPU		surface mount version of 1LF5-0002
1LF5-0301	1xC	Voyager Nut processor		replaced by 1LM2-0001
1LF6-0001	41CX, 82182A	timer (Phineas)
1LG7	71B etc. (in hybrid)	Saturn ROM, 32K*4
1LG7-0064	9807A Integral	Saturn ROM, 32K*4
1LG8-0001	71B etc. (in hybrid)	Saturn RAM, 2K*4
1LG9	41C	Nut ROM, 12K*10
1LG9-0001	41C, 41CV	ROM 0
1LG9-0008	41CX	ROM 0
1LG9-0011	41CX	ROM 1
1LH1	1xC	Voyager 6K*10 ROM/43*56 RAM/display driver
1LH1-0302	15C	RAM/ROM		used only as memory expansion, display driver not bonded out
1LH1-0304	12C	RAM/ROM/display
1LH1-0305	11C	RAM/ROM/display
1LH1-0306	15C	RAM/ROM/display
1LH5-0001	41C/CV/CX	RAM, 64*56		replaces 1LE7-0001
1LH5-0002	41CV/CX	RAM, 64*56
1LH5-0003	41CV/CX	RAM, 64*56
1LH5-0004	41CV/CX	RAM, 64*56
1LH5-0007	41CX	RAM, 64*56
1LJ7-0011	9807A Integral	HP-IL ThinkJet printer control, Saturn based
1LK7	71B, 18C, 28C	Saturn CPU		replaces 1LF2-0001
1LL3-0005	9807A Integral	display controller
1LM2-0001	1Cx	Voyager Nut processor		replaces 1LF5-0002
1LP2	18C, 28C	Saturn RAM/Display/Timer (Centipede)
1LP3	18C, 28C	Saturn ROM, 128K*4		one in 18C, two in 28C
1LP7	9807A Integral	HP-HIL slave
1LQ4	3rd party 71B accessories	Saturn bus to bytewide memory controller
1LQ9	1xC	Voyager Nut CPU/6K*10 ROM/43*56 RAM/display driver
1LQ9-0321	11C	single-chip
1LQ9-0322	12C	single-chip		replaced by 1RR2-0001
1LQ9-0325	15C	two-chip		used with 1LH1-0302
1LR2	17B, 17BII, 19B, 19BII, 27S, 28S, 42S	Saturn CPU/ROM/Display Driver, 64KB ROM (Lewis)		two each in 19B, 19BII, 28S, with CPU disabled in one
1LR3-nnnn	14B	Saturn CPU/ROM/RAM/Display Driver, 512B RAM, 16KB ROM (Sacajawea)
1LR3-nnnn	22S
1LR3-nnnn	32S
1LR3-nnnn, 00032-80029	32SII		NEC D3003GF-012
1LR4-0002	many	HP-IL interface chip		replaces 1LB3-0003
1LT8	48S/SX	Saturn processor (Clarke)
1LU7-0006	10B	Saturn CPU/ROM/RAM/Display Driver, 256B RAM, 10KB ROM (Bert)	HP
1LU7-0303	20S		HP
1LU7-nnnn	21S
1MA1	30E series	ROM, or (less likely?) ROM/RAM
1MA1-0002	31E	memory		replaced by 1MA3-0001
1MA1-0003	33E	memory
1MA1-0004	33E	memory		replaced by 1MA1-0204
1MA1-0005	38E	memory
1MA1-0007	38E	memory		replaced by 1MA3-0013?
1MA1-0008	37E	memory
1MA1-0009	32E	memory
1MA1-0010	32E	memory
1MA1-0012	3??	memory
1MA1-0013	38E	memory
1MA1-0014	34C	memory
1MA1-0015	34C	memory
1MA1-0204	33E	memory		replaces 1MA1-0004
1MA1-0209	32E	memory
1MA2-0002	85	RAM controller (U8)
1MA3-0001	31E	memory
1MA3-0002	33E	memory		replaces 1MA1-0003
1MA3-0003	38E	memory		replaces 1MA1-0007
1MA3-0004	32E	memory
1MA3-0005	38C	memory
1MA3-0006	38C	memory
1MA4-0001	33E	processor		replaces 1820-2105
1MA5-0101	85	CRT controller (CRT assembly U12)
1MA6-0001	85	tape controller (U1 of tape drive assembly)
1MA7-0060	85	ROM 0 (U4)
1MA7-0063	85	ROM 3 (U7)
1MA7-0066	85	ROM 2 (U6)
1MA7-0068	85	ROM 1 (U5)
1MA8-0101	85	I/O buffer (U1)
1MA9-0101	85	printer controller (U5 of printer assembly)
1MB1-0001	85	Capricorn CPU (U2)
1MB2-0001	85	keyboard controller (U3)
1MB5-0101	82937A, 82938A, 82939A, 82950A	bus translator
1MB5-0102	82900A	bus translator
1MC2-0101	82909A	memory controller, 128K RAM for Series 80
1MC4-0003	85B	memory controller, 64K RAM for HP-85b (U8)
1RC8-6001	9807A Integral	HP-HIL slave
1RD2-6001	9807A Integral	HP-HIL host
1RR2-0001	12C	single-chip		replaces 1LQ9-0322, replaced by 2AF1-0001
2AF1-0001	12C	single-chip	Agilent	replaced 1RR2-0001

Glossary

ACT

Arithmetic Control and Timing

ARC

Arithmetic and Register Circuit

CRC

Card Reader Control

CTC

Control and Timing Circuit

NPIC

Nut Peripheral Interface Chip

PIK

Printer Interface/Keyboard

R2D2

ROM, RAM, and Display Driver

Saturn Notes

The original Saturn processor used in the 71B was the 1LF2. It provides the base "level 0" instruction set.

The processor was redesigned in a newer CMOS process for lower voltage operation and reduced power consumption, resulting in the 1LK7. This was used in the 18C, 28C, and in 71B units with serial numbers of 2623A00000 or higher A few new instructions were added, yielding the "level 1" instruction set.

The final upgrade to the prcoessor core resulted in the "level 2" instruction set, which offered many new instructions. This core was used in all later Saturn processors, including the Lewis (1LR2), Sacajawea (1LR3), Clarke (1LT8), Bert (1LU7), and Yorke (00048-80063).

Acknowledgements

Thanks to the following people for helping collect this information:

• Luiz Cláudio
• Tony Duell
• Patrick Earhart
• Bernhard Emese
• Bernhard Engl
• Christoph Giesselink
• Dave Hicks
• Peter Monta
• Nelson Sicuro
• Mark Sims
• Randy Sloyer
• Ken Sumrall

My apologies if I've omitted anyone.