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{{Oscilloscope Sidebar|
{{Oscilloscope Sidebar  
title=Tektronix 7854|
|manufacturer=Tektronix
image=tek7854.jpg|
|series=7000-series scopes
caption=Tektronix 7854 on a [[K213]] cart|
|model=7854
introduced=1980 |
|image=tek7854.jpg
discontinued=1990 |
|caption=Tektronix 7854 on a [[K213]] cart
summary=400 MHz waveform-processing scope|
|introduced=1980  
manuals=
|discontinued=1990  
* [http://w140.com/070-2874-01.pdf Tektronix 7854 Manual (PDF, OCR)]
|summary=400 MHz waveform-processing scope
* [http://w140.com/7854_manual_change_info_d.pdf Tektronix 7854 Manual Change Information (PDF)]
|designers=Tom Rousseau;Les Larson;Jack Collins;Ellen Deleganes;Jim Schlegel;Gary Fladstol;Val Garuts;Tim Holte;Burt Johnson;Bruce Kingsland;Wes Kosta;Jim Tallman;Kirk Wimmer
* [[Media:Tektronix_070-2873-00.pdf | 7854 Operators Manual (PDF)]]
|manuals=
* [http://w140.com/7854_test_point_and_adj_locations_d.pdf Tektronix 7854 Test Points and Adjustment Locations (PDF)]
* [[Media:070-2873-00.pdf |  7854 Operators Manual           ]]
* [http://w140.com/7854_schematics_d.pdf Tektronix 7854 Schematics (cleaned up, PDF)]
* [[Media:070-2874-01.pdf |  7854 Service Manual, Sept. 1981 ]]
'''Application Notes'''
 
* [http://w140.com/tek_7854_diagnostic_with_067-0911-00.pdf Tektronix 7854 Diagnostic Troubleshooting with the 067-0911-00 (PDF)]
* [[Media:Tektronix 7854 Manual Change Info D.pdf                   | 7854 Manual Change Information            ]] through Jan 1991
* [http://www.davmar.org/TE/Tek7854/Tek7854-AN-SPSBasic.pdf Talking to the 7854 scope with TEK SPS BASIC] (PDF)
* [[Media:Tektronix 7854 Test Point and Adjustment Locations D.pdf | 7854 Test Points and Adjustment Locations ]]
* [[Media:7854 Application Programs.pdf|7854 Application Programs (PDF)]]
* [[Media:Tektronix 7854 Schematics D.pdf                           | 7854 Schematics                           ]]
* [[Media:Tek_AX4864_7854_keyboard_guide.pdf|Waveform Processing Keyboard Guide (PDF, OCR)]]
 
* [[Media:Tek_AX4382_7854_wp1310_01.pdf|WP1310 Waveform Processing System (PDF, OCR)]]
'''Modifications'''
* [[Media:Tek_AX4425_7854_WP1310_02.pdf|WP1310 Signal Processing System (PDF, OCR)]]
* [[Media:040-1066-00.pdf | 040-1066-00: Vertical Pickoff Amplifier Drift Improvement ]] (1982)
* [[Media:42AX-4682.pdf|7854 Programming Techniques (PDF, OCR)]]
* [[Media:045-0056-00.pdf | 045-0056-00: Firmware update 1.03                        ]] (1983)
* [[Media:Tek_AX4281_7854_measurement_variety.pdf|7854 Measurement Variety (PDF, OCR)]]
 
* [[Media:Tek_AX4440_7854_onboard_digital_processing.pdf|7854 onboard digital processing (PDF, OCR)]]
'''Troubleshooting'''
* [[Media:Tek_7854_42W6767_tdr_mps_package_sm.pdf|7854TDR and 7854MPS package (PDF, OCR)]]
* [[Media:070-2875-00.pdf | 7854 Test Procedures using the 067-0911-00 & up Diagnostic Test Interface Volume 1 Service ]]
* [[Media:42W-5334.pdf|7854 Automated TDR testing (PDF, OCR)]]
* [[Media:070-3887-00.pdf | 7854 Test Procedures using the 067-0911-00 & up Diagnostic Test Interface Volume 2 Service ]]
* [[Media:Tek_42W67321_Tekmap_7854_measurement.pdf|TekMAP 7854 Measurement Software (PDF, OCR)]]
* [[Media:070-2876-00.pdf | 7854 Diagnostic Troubleshooting using the 067-0911-00 & up Diagnostic Test Interface        ]]
* [http://www.hakanh.com/dl/docs/kitinstructions/040-1066-00.pdf Tektronix 040-1066-00 Vertical Pickoff Amplifier Drift Improvement (PDF)]
* [[Media:070-2972-00.pdf | 7854 Signature Analysis Tables using 067-0911-00                                            ]]
* [http://www.hakanh.com/dl/docs/kitinstructions/045-0056-00.pdf Tektronix 045-0056-00 Firmware update (PDF)]
* [[Media:070-3801-00.pdf | 7854 Diagnostic Memory service manual                                                        ]]
 
'''Other Info'''
'''Other Info'''
* [[Media:Tekniques 15Dec1980 vol4 no8 7854excerpt.pdf|7854-Related Excerpt from Tekniques Vol 4 No 8 (PDF)]]
* [[Media:Tekniques 15Dec1980 vol4 no8 7854excerpt.pdf       | 7854-Related Excerpt from Tekniques Vol 4 No 8                     ]]
* [[Media:Tek 7854 article garuts tallman.pdf|Article on the 7854 by Val Garuts and Jim Tallman (PDF)]]
* [[Media:Tek 7854 eis signature page.pdf                   | Tektronix 7854 Engineering Instrument Specification Signature Page ]]
* [[Media:Tek 7854 eis signature page.pdf|Tektronix 7854 Engineering Instrument Specification Signature Page (PDF, needs OCR)]]
* [[Media:Tek_7854_42W5198_specs_orderinginfo.pdf           | 7854 specifications and ordering information                       ]]
* [[Media:Tek_7854_42W5198_specs_orderinginfo.pdf|7854 specifications and ordering information (PDF, OCR)]]
* [[Media:7854 source 1v02 1982 cover.pdf                   | Tektronix 7854 Source Code                                         ]]
* [[Media:7854 source 1v02 1982 cover.pdf|Tektronix 7854 Source Code (PDF)]]
* [[Media:Tek 7854 wizard workshop.pdf                      | Tektronix Wizard Workshop Articles Relating to the 7854            ]]
* [[Media:Tek 7854 factory analog calibration procedure.pdf  | Tektronix 7854 Factory Analog Calibration Procedure                ]]
* [[Media:Tek 7854 factory digital calibration procedure.pdf | Tektronix 7854 Factory Digital Calibration Procedure              ]]
* [[Media:Tek 7854 board test procedures.pdf                | Tektronix 7854 Board Test Procedures                              ]]
* [[Media:Tek 7854 npi.pdf                                  | Tektronix 7854 New Product Introduction Review                    ]]
* [[Media:Dennis Tillman 7104-7854 SMPS Dummy Load.pdf      | Dummy load for troubleshooting 7854 and 7104 SMPS (Dennis Tillman) ]]
}}
}}
The '''Tektronix 7854 Waveform Processing Oscilloscope''', introduced in 1980, is a 400 MHz combined analog / digital  
The '''Tektronix 7854 Waveform Processing Oscilloscope''', introduced in 1980, is a 400 MHz combined analog / digital  
mainframe in the 7000 series that takes two vertical and two horizontal [[7000-series_plug-ins|7000-series plug-ins]].
mainframe in the 7000 series that takes two vertical and two horizontal [[7000-series_plug-ins|7000-series plug-ins]].
In addition to a conventional analog (real time) scope, it contains an equivalent-time sampling 10-bit digitizer and a  
In addition to a conventional analog (real time) scope, it contains an equivalent-time sampling 10-bit digitizer and a programmable waveform processor with GPIB interface.  
programmable waveform processor with GPIB interface. Single-shot, pretrigger acquisition is possible with the special [[7B87]] time base using real-time sampling.   
Single-shot, pretrigger acquisition is possible with the special [[7B87]] time base using real-time sampling.   
The project manager for the 7854 was [[Tom Rousseau]].
The project manager for the 7854 was [[Tom Rousseau]].
During early development, before it was given the name "7854", the product was referred to as the "Smart Scope",
and the digital processing was called the "smarts".


The waveform processor can be programmed using a detachable calculator-style keyboard, using postfix operators
The waveform processor can be programmed using a detachable calculator-style keyboard, using postfix operators ("[[wikipedia:Reverse Polish notation|reverse Polish notation]]" like [[wikipedia:HP-35|HP calculators]]) that operate on entire waveforms, not just individual numbers.
("reverse Polish notation" like HP calculators) that operate on entire waveforms, not just individual numbers.
 
{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | Bandwidth | (analog) 400 MHz }}
{{Spec | Bandwidth         | (analog) 400 MHz }}
{{Spec | Fastest cal. sweep | 500 ps }}
{{Spec | Fastest cal. sweep | 500 ps/Div }}
{{Spec | Sample rate | 500 kHz (stores repetitive waveforms up to 400 MHz) }}
{{Spec | Sample rate       | 500 kHz (stores repetitive waveforms up to 400 MHz) }}
{{Spec | Resolution | 10 bit }}
{{Spec | Resolution         | 10 bit }}
{{Spec | Acquisition depth | 128, 256, 512 or 1024 points }}
{{Spec | Acquisition depth | 128, 256, 512 or 1024 points }}
{{Spec | Memory capacity | 2048 waveform points in up to 16 waveforms (optional expansion to 5120 points and 40 waveforms) }}
{{Spec | Memory capacity   | 2048 waveform points in up to 16 waveforms (optional expansion to 5120 points and 40 waveforms) }}
{{Spec | Single shot | events and pretrigger up to 50 µs/div ("2.5 µs/point") with the [[7B87]] Time Base}}
{{Spec | Single shot       | events and pretrigger up to 50 µs/div ("2.5 µs/point") with the [[7B87]] Time Base}}
{{Spec | CRT | [[154-0644-05]] ([[Phosphor|P-31]]) or [[154-0893-09]] ([[Phosphor|P-11]]); cathode −3 kV, anode +21 kV, [[distributed deflection plates|distributed vertical deflection plates]] }}
{{Spec | CRT               | [[154-0644-05]] ([[Phosphor|P31]]) or [[154-0893-09]] ([[Phosphor|P11]]); cathode −3 kV, anode +21 kV, [[distributed deflection plates|distributed vertical deflection plates]] }}
{{Spec | Features |
{{Spec | Features |
* Signal Averaging
* Signal averaging
* Cursor measurements
* Cursor measurements
* Waveform parameter measurements  
* Waveform parameter measurements  
* GPIB Interface (Standard)
* GPIB interface (standard)
* Waveform calculation operators - add, multiply, square root, log, abs  
* Waveform calculation operators - add, multiply, square root, log, abs  
* Internal RPN programming language (Reverse Polish Notation)
* Internal RPN programming language (Reverse Polish Notation)
* Keystroke Programming (Up to 2000 Keystrokes with Option 2D)
* Keystroke programming (up to 2000 keystrokes with option 2D)
* programmable text display on screen
* Programmable text display on screen
}}
{{Spec | Options |
* Option 02: X-Y Phase Correction
* Option 03: EMC Modification
* Option 78: P11 Phosphor
* Option 2D: 4K Expanded memory storage for up to 40 waveforms and 2000 keystrokes
}}
}}
{{Spec | Power consumption | 230 W }}
{{Spec | Weight | 42 lbs / 19 kg }}
{{EndSpecs}}
{{EndSpecs}}


==Internals==
==Documents==
The acquisition system uses what Tektronix termed a "display-oriented random sampling digitizing technique".
{{Documents|Link=7854}}
It simultaneously digitizes a pair of X and Y signal values at a rate of 3.5 µs/point, using Schottky diode bridge
based sample/hold circuits and a single 10-bit successive-approximation ADC.  The Y sample value is then
written into the memory location addressed by the X value, using DMA.
 
The CPU in the 7854 is a [https://en.wikipedia.org/wiki/Texas_Instruments_TMS9900 Texas Instruments TMS9900 16-bit microprocessor],
known from the infamous TI-99/4 home computer of the late 70s, with 32+6KByte ROM and 8KByte RAM.
 
The firmware consists of mask ROMs, an FPLA, and patch EPROMs.  These ROMs (particularly the early ones from Mostek) are a common point-of-failure. Several remedies exist, [[7854rom|outlined here]].
 
==Software==
 
* http://w140.com/tek_7854_pcbasic.zip
* http://w140.com/tek_7854_sw.zip


==Prices==
==Prices==
Line 85: Line 86:
! Year
! Year
! 1981
! 1981
! 1984
! 1990
! 1990
|-
|-
! Catalog price
! Catalog price
| $10,500
| $10,500
| $14,230
| $17,000
| $17,000
|-
|-
! 2019 value
! In 2023 Dollars
| $29,360
| $35,500
| $33,060
| $42,000
| $39,900
|}
|}


Line 105: Line 109:
* [[067-0914-00]] Extender Board 80-Pin (used with the A27-MPU and A28-RAM Boards)
* [[067-0914-00]] Extender Board 80-Pin (used with the A27-MPU and A28-RAM Boards)
* [[067-0915-00]] Extender Board 124-Pin (used with the A26-Control Logic and A29-Display Boards)
* [[067-0915-00]] Extender Board 124-Pin (used with the A26-Control Logic and A29-Display Boards)
==Software==
* [[Media:42W-5802.pdf|Application Note 42W-5802, BASIC Software Programs for Communicating Between the 7854 and IBM PC]], 1985 (OCR)
* [[Media:Tek_7854_sw.zip|7854 software in BASIC]]
* [[Media:Fftprog.zip | FFT program]]


==Links==
==Links==
* [[Media:Tek 7854 design team.pdf|Tek 7854 Design Team]]
* ''[[Media:Handshake winter 1980 1981.pdf|Talking to the 7854 Oscilloscope with TEK SPS BASIC]]'' in ''Handshake'', Winter 1980/81
* [[Media:Tek 7854 design team.pdf|Tek 7854 Design Team]] Note: The graduation cap on the Engineering Release cake (page 8) signifies that it is the "Smart Scope".
* [https://www.curiousmarc.com/instruments/tek-7854-oscilloscope Tek 7854 @ curiousmarc] (with links to videos)
* [https://www.curiousmarc.com/instruments/tek-7854-oscilloscope Tek 7854 @ curiousmarc] (with links to videos)
* [http://amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_mainframe/7854.html Tek 7854 @ amplifier.cd]
* [https://amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_mainframe/7854.html Tek 7854 @ amplifier.cd]
* [http://www.barrytech.com/tektronix/tek7000/tek7854.html Tek 7854 @ barrytech.com]
* [https://groups.io/g/TekScopes/topic/7854_roms_the_whole_story/73320555 7854 ROMs, the whole story] @ TekScopes groups.io
* [https://vintagetek.org/7854-mostek-mkb36000-rom-repairs Mostek ROM Repairs @ vintagetek.org]
* [https://vintagetek.org/7854-mostek-mkb36000-rom-repairs Mostek ROM Repairs @ vintagetek.org]
* [https://paulcarbone.com/blog/tektronix-7854/ overview of ROM repair options @ paulcarbone.com]
* [https://paulcarbone.com/blog/tektronix-7854/ overview of ROM repair options @ paulcarbone.com]
==Internals==
The acquisition system uses what Tektronix termed a "display-oriented random sampling digitizing technique".
It simultaneously digitizes a pair of X and Y signal values at a rate of 3.5 µs/point, using sample/hold circuits based on Schottky diode bridges, and a single 10-bit successive-approximation ADC.  The Y sample value is then written into the memory location addressed by the X value, using DMA (direct memory access, i.e. bypassing the CPU).
The CPU in the 7854 is a [[Texas Instruments TMS9900]] 16-bit microprocessor, known from the infamous TI-99/4 home computer of the late 70s, with 32+6KByte ROM and 8KByte RAM.
The firmware consists of mask ROMs, an FPLA, and patch EPROMs.  These ROMs (particularly the early ones from Mostek) are a common point-of-failure. Several remedies exist, see the [[7854/Repairs|Repairs]] page.


==Pictures==
==Pictures==
Line 130: Line 149:
Tek 7854 a2.jpg|A2 Mode Switch
Tek 7854 a2.jpg|A2 Mode Switch
Tek 7854 mode switch.jpg|A2 Mode Switch
Tek 7854 mode switch.jpg|A2 Mode Switch
Tek 7854 aux reg.jpg|A7 Aux Reg
Tek_7854_AUX_REG-A7.jpg|The A7 / Auxiliary regulator
Tek 7854 aux reg.jpg|A different revision of the A7 board
Tek 7854 main interface.jpg|A11 Main Interface
Tek 7854 main interface.jpg|A11 Main Interface
Tek 7854 a15b.jpg|A15 Signal Output
Tek 7854 a15b.jpg|A15 Signal Output
Line 142: Line 162:
Tek 7854 t1.jpg|A21 Z-Axis
Tek 7854 t1.jpg|A21 Z-Axis
Tek 7854 digitizer.jpg|A25 Digitizer
Tek 7854 digitizer.jpg|A25 Digitizer
Tek 7854 a26.jpg |A26 Control Logic Board
Tek_7854_CONTROL_LOGIC-A26.jpg| A26 Control Logic Board
Tek 7854 a26.jpg |A26 Control Logic Board  
Tek 7854 logic.jpg|A26 Control Logic Board
Tek 7854 logic.jpg|A26 Control Logic Board
Tek_7854_MPU-A27.jpg|A27 MPU
Tek_7854_MPU-A27.jpg|A27 MPU
Line 149: Line 170:
Tek 7854 a28.jpg|A28 RAM Board with option 2D (RAM Expansion)
Tek 7854 a28.jpg|A28 RAM Board with option 2D (RAM Expansion)
A29.jpg|A29 Display Board
A29.jpg|A29 Display Board
Tek 7854 gpib.jpg|A30 GPIB
Tek_7854_GPIB-A30.jpg|A30 / GPIB board
Tek 7854 gpib.jpg|A30 GPIB, different revision
A31.jpg|A31 ROM Board
A31.jpg|A31 ROM Board
Tek 7854 a32.jpg|A32 Rear Panel Connector
Tek 7854 a32.jpg|A32 Rear Panel Connector
Line 159: Line 181:
7854_pattern_program.png | Program for generating Alignment Pattern
7854_pattern_program.png | Program for generating Alignment Pattern
Tek_7854_rise_time.jpg | Mainframe rise time measured with [[067-0587-02]]
Tek_7854_rise_time.jpg | Mainframe rise time measured with [[067-0587-02]]
Tek_microlab_connected_7854_01.jpg|7854 diagnostics system with [[MicroLab I]]
</gallery>
</gallery>


Line 170: Line 193:
! colspan="3"|Purpose
! colspan="3"|Purpose
|-
|-
! 0000...3FFE
|align="center"| 0000...3FFE
! 8k
|align="center"| 8k
! U100+U110
|align="center"| U100, U110
! colspan="3"|ROM
|align="center" colspan="3"|ROM
|-
|-
! 4000...7FFE
|align="center"| 4000...7FFE
! 8k
|align="center"| 8k
! U200+U210
|align="center"| U200, U210
! colspan="3"|ROM
|align="center" colspan="3"|ROM
|-
|-
! 8000...8FFE
|align="center"| 8000...8FFE
! 2k
|align="center"| 2k
! U300+U310
|align="center"| U300, U310
! colspan="3"|PATCH ROM “for future use”
|align="center" colspan="3"|PATCH ROM “for future use”
|-
|-
! 9000...9FFE
|align="center"| 9000...9FFE
! 2k
|align="center"| 2k
! U400+U410
|align="center"| U400,U410
! colspan="3"|PATCH + ROM
|align="center" colspan="3"|PATCH + ROM
|-
|-
!
!
Line 197: Line 220:
! 8k RAM
! 8k RAM
|-
|-
! A000...A7FE
|align="center"| A000...A7FE
! 1k
|align="center"| 1k
! U510+U520+U530+U540
|align="center"| U510,U520,U530,U540
! x
|align="center"| x
! x
|align="center"| x
! x
! x
|-
|-
! A800...AFFE
|align="center"| A800...AFFE
! 1k
|align="center"| 1k
! U610+U620+U630+U640
|align="center"| U610,U620,U630,U640
!
|align="center"|
! x
|align="center"| x
! x
|align="center"| x
|-
|-
! B000...B7FE
|align="center"| B000...B7FE
! 1k
|align="center"| 1k
! U710+U720+U730+U740
|align="center"| U710,U720,U730,U740
!
|align="center"|
!
|align="center"|
! x
|align="center"| x
|-
|-
! B800...BFFE
|align="center"| B800...BFFE
! 1k
|align="center"| 1k
! U810+U820+U830+U840
|align="center"| U810,U820,U830,U840
!
|align="center"|
!
|align="center"|
! x
|align="center"| x
|-
|-
! C000...C7FE
|align="center"| C000...C7FE
! 1k
|align="center"| 1k
! U110+U120+U130+U140
|align="center"| U110,U120,U130,U140
!
|align="center"|
!
|align="center"|
! x
|align="center"| x
|-
|-
! C800...CFFE
|align="center"| C800...CFFE
! 1k
|align="center"| 1k
! U210+U220+U230+U240
|align="center"| U210,U220,U230,U240
!
|align="center"|
!
|align="center"|
! x
|align="center"| x
|-
|-
! D000...D7FE
|align="center"| D000...D7FE
! 1k
|align="center"| 1k
! U310+U320+U330+U340
|align="center"| U310,U320,U330,U340
!
|align="center"|
! x
|align="center"| x
! x
|align="center"| x
|-
|-
! D800...DFFE
|align="center"| D800...DFFE
! 1k
|align="center"| 1k
! U410+U420+U430+U440
|align="center"| U410,U420,U430,U440
! x
|align="center"| x
! x
|align="center"| x
! x
|align="center"| x
|-
|-
! E000...E37E
|align="center"| E000...E37E
!
|align="center"|
!
|align="center"|
! colspan="3"|GPIB, Keyboards, Digitizer,...
|align="center" colspan="3"|GPIB, Keyboards, Digitizer,...
|-
|-
! E380...FFFE
|align="center"| E380...FFFE
!
|align="center"|
!
|align="center"|
! colspan="3"|Reserved for Diagnostic Interface
|align="center" colspan="3"|Reserved for Diagnostic Interface
|}
|}


===Devices with combined RAM+ROM Board (SN >= B100000)===
===Devices with combined RAM+ROM Board (SN >= B100000)===
Line 273: Line 295:
! Purpose
! Purpose
|-
|-
! 0000...7FFE
|align="center"| 0000...7FFE
! 16k
|align="center"| 16k
! U220+U320
|align="center"| U220,U320
! ROM
|align="center"| ROM
|-
|-
! 8000...9FFE
|align="center"| 8000...9FFE
! 4k
|align="center"| 4k
! U200+U300
|align="center"| U200,U300
! ROM for future use
|align="center"| ROM for future use
|-
|-
! A000...DFFE
|align="center"| A000...DFFE
! 8k
|align="center"| 8k
! U400+U410
|align="center"| U400,U410
! RAM
|align="center"| RAM
|-
|-
! E000...E37E
|align="center"| E000...E37E
! 4k
|align="center"| 4k
!
|align="center"|
! GPIB, Keyboards, Digitizer,...
|align="center"| GPIB, Keyboards, Digitizer,...
|-
|-
! E380...FFFE
|align="center"| E380...FFFE
!
|align="center"|
!
|align="center"|
! Reserved for Diagnostio Interface
|align="center"| Reserved for Diagnostic Interface
|}
|}


===Devices with installed Diagnostic Boards (all serial numbers)===
===Devices with installed Diagnostic Boards (all serial numbers)===
Line 308: Line 329:
! Purpose
! Purpose
|-
|-
! 0000...0FFE
|align="center"| 0000...0FFE
! 2k
|align="center"| 2k
! U430+U330
|align="center"| U430,U330
! ROM
|align="center"| ROM
|-
|-
! 1000...1FFE
|align="center"| 1000...1FFE
! 2k
|align="center"| 2k
! U410+U310
|align="center"| U410,U310
! ROM
|align="center"| ROM
|-
|-
! 2000...2FFE
|align="center"| 2000...2FFE
! 2k
|align="center"| 2k
! U200+U100
|align="center"| U200,U100
! ROM
|align="center"| ROM
|-
|-
! 3000...3FFE
|align="center"| 3000...3FFE
! 2k
|align="center"| 2k
! U220+U120
|align="center"| U220,U120
! ROM
|align="center"| ROM
|-
|-
! 4000...4FFE
|align="center"| 4000...4FFE
! 2k
|align="center"| 2k
! U420+U320
|align="center"| U420,U320
! ROM
|align="center"| ROM
|-
|-
! 5000...5FFE
|align="center"| 5000...5FFE
! 2k
|align="center"| 2k
! U400+U300
|align="center"| U400,U300
! ROM
|align="center"| ROM
|-
|-
! 6000...6FFE
|align="center"| 6000...6FFE
! 2K
|align="center"| 2K
! U210+U110
|align="center"| U210,U110
! ROM
|align="center"| ROM
|-
|-
! 7000...7FFE
|align="center"| 7000...7FFE
! 2K
|align="center"| 2K
!
|align="center"|
! ROM for future use
|align="center"| ROM for future use
|-
|-
! 8000...7FFE
|align="center"| 8000...7FFE
! 4k
|align="center"| 4k
!
|align="center"|
! Not used
|align="center"| Not used
|-
|-
! 9800...9FFE
|align="center"| 9800...9FFE
!
|align="center"|
!
|align="center"|
! RAM in Microlab I, disabled when standard ROM is in 7854
|align="center"| RAM in Microlab I, disabled when standard ROM is in 7854
|-
|-
! A000...DFFE
|align="center"| A000...DFFE
! 2...8k
|align="center"| 2...8k
!
|align="center"|
! RAM – see tables above
|align="center"| RAM – see tables above
|-
|-
! E000...E37E
|align="center"| E000...E37E
!
|align="center"|
!
|align="center"|
! GPIB, Keyboards, Digitizer,...
|align="center"| GPIB, Keyboards, Digitizer,...
|-
|-
! E380...E39E
|align="center"| E380...E39E
!
|align="center"|
!
|align="center"|
! BKREGCS Breakpoint address register chip select
|align="center"| BKREGCS Breakpoint address register chip select
|-
|-
! E3A0...E3BE
|align="center"| E3A0...E3BE
!
|align="center"|
!
|align="center"|
! CTREGCS control register chip select
|align="center"| CTREGCS control register chip select
|-
|-
! E3C0...E3DE
|align="center"| E3C0...E3DE
!
|align="center"|
!
|align="center"|
! BKDATA breakpoint data latch
|align="center"| BKDATA breakpoint data latch
|-
|-
! E3E0
|align="center"| E3E0
!
|align="center"|
!
|align="center"|
! F/P Display Data
|align="center"| F/P Display Data
|-
|-
! E3E2
|align="center"| E3E2
!
|align="center"|
!
|align="center"|
! F/P Display Data
|align="center"| F/P Display Data
|-
|-
! E3E4
|align="center"| E3E4
!
|align="center"|
!
|align="center"|
! F/P Keyboard Data
|align="center"| F/P Keyboard Data
|-
|-
! E3E6
|align="center"| E3E6
!
|align="center"|
!
|align="center"|
! F/P Keyboard flag reset
|align="center"| F/P Keyboard flag reset
|-
|-
! E3E8
|align="center"| E3E8
!
|align="center"|
!
|align="center"|
! Terminal I/O Control
|align="center"| Terminal I/O Control
|-
|-
! E3EA
|align="center"| E3EA
!
|align="center"|
!
|align="center"|
! Terminal I/O Data
|align="center"| Terminal I/O Data
|-
|-
! E3EC
|align="center"| E3EC
!
|align="center"|
!
|align="center"|
! Cassette I/O Control
|align="center"| Cassette I/O Control
|-
|-
! E3EE
|align="center"| E3EE
!
|align="center"|
!
|align="center"|
! Cassette I/O Data
|align="center"| Cassette I/O Data
|-
|-
! E3F0
|align="center"| E3F0
!
|align="center"|
!
|align="center"|
! Modem I/O Control
|align="center"| Modem I/O Control
|-
|-
! E3F2
|align="center"| E3F2
!
|align="center"|
!
|align="center"|
! Modem I/O Data
|align="center"| Modem I/O Data
|-
|-
! E3F4...E3FE
|align="center"| E3F4...E3FE
!
|align="center"|
!
|align="center"|
! ONBDIO on board input/output to microlab I
|align="center"| ONBDIO on board input/output to microlab I
|-
|-
! E400...E7FE
|align="center"| E400...E7FE
!
|align="center"|
!
|align="center"|
! RAM in Microlab I
|align="center"| RAM in Microlab I
|-
|-
! E800...EFFE
|align="center"| E800...EFFE
!
|align="center"|
! U120+U225
|align="center"| U120,U225
! ROM - bank switched by PROMBK
|align="center"| ROM - bank switched by PROMBK
|-
|-
! F000...FFFE
|align="center"| F000...FFFE
!
|align="center"|
! U220+U320
|align="center"| U220,U320
! ROM - bank switched by PROMBK
|align="center"| ROM - bank switched by PROMBK
|}
|}


 
==Components==
 
{{Parts|7854}}




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