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{{Oscilloscope Sidebar| | {{Oscilloscope Sidebar | ||
|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 | ||
* [ | |summary=400 MHz waveform-processing scope | ||
|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: | |manuals= | ||
* [ | * [[Media:070-2873-00.pdf | 7854 Operators Manual with manual changes at the end ]] | ||
* [[Media:070-2873-00 vintagetek.pdf | 7854 Operators Manual color scan without manual changes ]] | |||
* [[Media:070-2874-01.pdf | 7854 Service Manual, Sept. 1981 ]] | |||
* [ | |||
* [[Media:Tektronix 7854 Manual Change Info D.pdf | 7854 Manual Change Information ]] through Jan 1991 | |||
* [[Media:7854 | * [[Media:Tektronix 7854 Test Point and Adjustment Locations D.pdf | 7854 Test Points and Adjustment Locations ]] | ||
* [[Media: | * [[Media:Tektronix 7854 Schematics D.pdf | 7854 Schematics ]] | ||
* [[Media: | |||
'''Modifications''' | |||
* [[Media: | * [[Media:040-1066-00.pdf | 040-1066-00: Vertical Pickoff Amplifier Drift Improvement ]] (1982) | ||
* [[Media:045-0056-00.pdf | 045-0056-00: Firmware update 1.03 ]] (1983) | |||
* [[Media: | |||
* [[Media: | '''Troubleshooting''' | ||
* [[Media: | * [[Media:070-2875-00.pdf | 7854 Test Procedures using the 067-0911-00 & up Diagnostic Test Interface Volume 1 Service ]] | ||
* [[Media: | * [[Media:070-3887-00.pdf | 7854 Test Procedures using the 067-0911-00 & up Diagnostic Test Interface Volume 2 Service ]] | ||
* [[Media:070-2876-00.pdf | 7854 Diagnostic Troubleshooting using the 067-0911-00 & up Diagnostic Test Interface ]] | |||
* [ | * [[Media:070-2972-00.pdf | 7854 Signature Analysis Tables using 067-0911-00 ]] | ||
* [[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 | * [[Media:Tekniques 15Dec1980 vol4 no8 7854excerpt.pdf | 7854-Related Excerpt from Tekniques Vol 4 No 8 ]] | ||
* [[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 | * [[Media:Tek_7854_42W5198_specs_orderinginfo.pdf | 7854 specifications and ordering information ]] | ||
* [[Media:Tek_7854_42W5198_specs_orderinginfo.pdf|7854 specifications and ordering information | * [[Media:7854 source 1v02 1982 cover.pdf | Tektronix 7854 Source Code ]] | ||
* [[Media:7854 source 1v02 1982 cover.pdf|Tektronix 7854 Source Code ( | * [[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. | ||
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 ("[[wikipedia:Reverse Polish notation|reverse Polish notation]]" like [[wikipedia:HP-35|HP calculators]]) that operate on entire waveforms, not just individual numbers. | |||
Project manager for the 7854 was [[Tom Rousseau]]. | |||
{{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| | {{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 | * Signal averaging | ||
* Cursor measurements | * Cursor measurements | ||
* Waveform parameter measurements | * Waveform parameter measurements | ||
* GPIB | * 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 | * Keystroke programming (up to 2000 keystrokes with option 2D) | ||
* | * 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}} | ||
== | ==Documents== | ||
{{Documents|Link=7854}} | |||
{{PatentLinks|7854}} | |||
==Prices== | ==Prices== | ||
Line 85: | Line 90: | ||
! Year | ! Year | ||
! 1981 | ! 1981 | ||
! 1984 | |||
! 1990 | ! 1990 | ||
|- | |- | ||
! Catalog price | ! Catalog price | ||
| $10,500 | | $10,500 | ||
| $14,230 | |||
| $17,000 | | $17,000 | ||
|- | |- | ||
! | ! In 2023 Dollars | ||
| $ | | $35,500 | ||
| $ | | $42,000 | ||
| $39,900 | |||
|} | |} | ||
Line 105: | Line 113: | ||
* [[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) | ||
* [ | * [https://amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_mainframe/7854.html Tek 7854 @ amplifier.cd] | ||
* [ | * [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] | ||
* [https://www.youtube.com/watch?v=2YkJoh8SiMU Tektronix 7854] / [https://www.youtube.com/watch?v=74xNSRc63M8 Tektronix 7854 power supply troubleshooting] by tuopeek @ YouTube | |||
==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. | |||
==Design Team== | |||
* Project Manager: [[Tom Rousseau]] | |||
* Engineering: | |||
** Instrument Concept: [[Val Garuts]] | |||
** System architecture, testability and training: [[Jim Tallman]] | |||
** Digitizer: [[Les Larson]] | |||
** Interface and CRT circuits: [[Wes Kosta]] | |||
** Display and MPU circuits: [[Gary Fladstol]] | |||
** Power supplies and memories: [[Kirk Wimmer]] | |||
** High speed analog circuits: [[Tim Holte]] | |||
** Sampler: [[Jack Collins]] | |||
** Firmware: [[Burt Johnson]], [[Jim Schlegel]], [[Ellen Deleganes]] | |||
** Mechanical design: [[Mark Anderson]], [[Ed Wolf]] | |||
** Evaluation: [[Greg Rogers]], [[Ray Blohm]], [[Roy Kaufman]], [[Mike Mraz]], [[Kathy Rudyk]], [[Gill Stephens]], [[Jim Peterson]] | |||
** Prototype & pilot builds: [[Bettie Turnbull]] | |||
** Technician: [[Bruce Kingsland]] | |||
** ECB: [[Betty Spohn]], [[Bob Chandler]], [[Hilde Bradley]], [[Ann Stephenson]], [[Lurene Lange]], [[Lois Sanders]] | |||
* Marketing: | |||
** Manager: [[Bob Roth|Bob Roth (Bar)]] | |||
** Applications Specialist: [[Clark Foley]] | |||
* Manufacturing: | |||
** Manager: [[Garry Johnson]], [[Howard Nutt]] | |||
** Technicians: [[Ernie Johnson]], [[Bob Simpson]] | |||
** Assemblers: [[Edna Harding]], [[Reba Norris]] | |||
** Engineer: [[Randy Nolan]] | |||
** Production Test Engineer: [[Mike Massey]], [[Bill Cox]], [[Norm Church]] | |||
* Factory Service: [[Dick Freshour]] | |||
* Manuals: [[Vern Litvin]], [[Rose Hill]], [[Ray Kennedy]], [[Paul Vankat]] | |||
==Pictures== | ==Pictures== | ||
Line 162: | Line 216: | ||
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 169: | Line 224: | ||
|- | |- | ||
! Address Range | ! Address Range | ||
! Size | ! Size<br>(16 bit) | ||
! ICs | ! ICs | ||
! colspan="3"|Purpose | ! colspan="3"|Purpose | ||
|- | |- | ||
|align="center"| 0000...3FFE | |||
|align="center"| 8k | |||
|align="center"| U100, U110 | |||
|align="center" colspan="3"|ROM | |||
|- | |- | ||
|align="center"| 4000...7FFE | |||
|align="center"| 8k | |||
|align="center"| U200, U210 | |||
|align="center" colspan="3"|ROM | |||
|- | |- | ||
|align="center"| 8000...8FFE | |||
|align="center"| 2k | |||
|align="center"| U300, U310 | |||
|align="center" colspan="3"|PATCH ROM “for future use” | |||
|- | |- | ||
|align="center"| 9000...9FFE | |||
|align="center"| 2k | |||
|align="center"| U400,U410 | |||
|align="center" colspan="3"|PATCH + ROM | |||
|- | |- | ||
! | ! | ||
Line 200: | Line 255: | ||
! 8k RAM | ! 8k RAM | ||
|- | |- | ||
|align="center"| A000...A7FE | |||
|align="center"| 1k | |||
|align="center"| U510,U520,U530,U540 | |||
|align="center"| x | |||
|align="center"| x | |||
|align="center"| x | |||
|- | |- | ||
|align="center"| A800...AFFE | |||
|align="center"| 1k | |||
|align="center"| U610,U620,U630,U640 | |||
|align="center"| | |||
|align="center"| x | |||
|align="center"| x | |||
|- | |- | ||
|align="center"| B000...B7FE | |||
|align="center"| 1k | |||
|align="center"| U710,U720,U730,U740 | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| x | |||
|- | |- | ||
|align="center"| B800...BFFE | |||
|align="center"| 1k | |||
|align="center"| U810,U820,U830,U840 | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| x | |||
|- | |- | ||
|align="center"| C000...C7FE | |||
|align="center"| 1k | |||
|align="center"| U110,U120,U130,U140 | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| x | |||
|- | |- | ||
|align="center"| C800...CFFE | |||
|align="center"| 1k | |||
|align="center"| U210,U220,U230,U240 | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| x | |||
|- | |- | ||
|align="center"| D000...D7FE | |||
|align="center"| 1k | |||
|align="center"| U310,U320,U330,U340 | |||
|align="center"| | |||
|align="center"| x | |||
|align="center"| x | |||
|- | |- | ||
|align="center"| D800...DFFE | |||
|align="center"| 1k | |||
|align="center"| U410,U420,U430,U440 | |||
|align="center"| x | |||
|align="center"| x | |||
|align="center"| x | |||
|- | |- | ||
|align="center"| E000...E37E | |||
|align="center"| | |||
|align="center"| | |||
|align="center" colspan="3"|GPIB, Keyboards, Digitizer,... | |||
|- | |- | ||
|align="center"| E380...FFFE | |||
|align="center"| | |||
|align="center"| | |||
|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 272: | Line 326: | ||
|- | |- | ||
! Address Range | ! Address Range | ||
! Size | ! Size<br>(16 bit) | ||
! ICs | ! ICs | ||
! Purpose | ! Purpose | ||
|- | |- | ||
|align="center"| 0000...7FFE | |||
|align="center"| 16k | |||
|align="center"| U220,U320 | |||
|align="center"| ROM | |||
|- | |- | ||
|align="center"| 8000...9FFE | |||
|align="center"| 4k | |||
|align="center"| U200,U300 | |||
|align="center"| ROM for future use | |||
|- | |- | ||
|align="center"| A000...DFFE | |||
|align="center"| 8k | |||
|align="center"| U400,U410 | |||
|align="center"| RAM | |||
|- | |- | ||
|align="center"| E000...E37E | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| GPIB, Keyboards, Digitizer,... | |||
|- | |- | ||
|align="center"| E380...FFFE | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| Reserved for Diagnostic Interface | |||
|} | |} | ||
===Devices with installed Diagnostic Boards (all serial numbers)=== | ===Devices with installed Diagnostic Boards (all serial numbers)=== | ||
Line 307: | Line 360: | ||
|- | |- | ||
! Address Range | ! Address Range | ||
! Size | ! Size<br>(16 bit) | ||
! ICs | ! ICs | ||
! Purpose | ! Purpose | ||
|- | |- | ||
|align="center"| 0000...0FFE | |||
|align="center"| 2k | |||
|align="center"| U430,U330 on<br>067-0961-00 | |||
|align="center"| ROM | |||
|- | |- | ||
|align="center"| 1000...1FFE | |||
|align="center"| 2k | |||
|align="center"| U410,U310 on<br>067-0961-00 | |||
|align="center"| ROM | |||
|- | |- | ||
|align="center"| 2000...2FFE | |||
|align="center"| 2k | |||
|align="center"| U200,U100 on<br>067-0961-00 | |||
|align="center"| ROM | |||
|- | |- | ||
|align="center"| 3000...3FFE | |||
|align="center"| 2k | |||
|align="center"| U220,U120 on<br>067-0961-00 | |||
|align="center"| ROM | |||
|- | |- | ||
|align="center"| 4000...4FFE | |||
|align="center"| 2k | |||
|align="center"| U420,U320 on<br>067-0961-00 | |||
|align="center"| ROM | |||
|- | |- | ||
|align="center"| 5000...5FFE | |||
|align="center"| 2k | |||
|align="center"| U400,U300 on<br>067-0961-00 | |||
|align="center"| ROM | |||
|- | |- | ||
|align="center"| 6000...6FFE | |||
|align="center"| 2K | |||
|align="center"| U210,U110 on<br>067-0961-00 | |||
|align="center"| ROM | |||
|- | |- | ||
|align="center"| 7000...7FFE | |||
|align="center"| 2K | |||
|align="center"| | |||
|align="center"| ROM for future use | |||
|- | |- | ||
|align="center"| 8000...97FE | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| Not used when 067-0961-00 is installed | |||
|- | |- | ||
|align="center"| 9800...9FFE | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| RAM in Microlab I, disabled when standard ROM is in 7854 | |||
|- | |- | ||
|align="center"| A000...DFFE | |||
|align="center"| 2...8k | |||
|align="center"| | |||
|align="center"| RAM – see tables above | |||
|- | |- | ||
|align="center"| E000...E37E | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| GPIB, Keyboards, Digitizer,... | |||
|- | |- | ||
|align="center"| E380...E39E | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| BKREGCS Breakpoint address register chip select | |||
|- | |- | ||
|align="center"| E3A0...E3BE | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| CTREGCS control register chip select | |||
|- | |- | ||
|align="center"| E3C0...E3DE | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| BKDATA breakpoint data latch | |||
|- | |- | ||
|align="center"| E3E0 | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| F/P Display Data | |||
|- | |- | ||
|align="center"| E3E2 | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| F/P Display Data | |||
|- | |- | ||
|align="center"| E3E4 | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| F/P Keyboard Data | |||
|- | |- | ||
|align="center"| E3E6 | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| F/P Keyboard flag reset | |||
|- | |- | ||
|align="center"| E3E8 | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| Terminal I/O Control | |||
|- | |- | ||
|align="center"| E3EA | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| Terminal I/O Data | |||
|- | |- | ||
|align="center"| E3EC | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| Cassette I/O Control | |||
|- | |- | ||
|align="center"| E3EE | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| Cassette I/O Data | |||
|- | |- | ||
|align="center"| E3F0 | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| Modem I/O Control | |||
|- | |- | ||
|align="center"| E3F2 | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| Modem I/O Data | |||
|- | |- | ||
|align="center"| E3F4...E3FE | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| ONBDIO on board input/output to microlab I | |||
|- | |- | ||
|align="center"| E400...E7FE | |||
|align="center"| | |||
|align="center"| | |||
|align="center"| RAM in Microlab I | |||
|- | |- | ||
|align="center"| E800...EFFE | |||
|align="center"| 1k | |||
|align="center"| U120,U225 on<br>067-0911-00 | |||
|align="center"| The 2k ROM is bank switched here by PROMBK | |||
|- | |- | ||
|align="center"| F000...FFFE | |||
|align="center"| 2k | |||
|align="center"| U220,U320 on<br>067-0911-00 | |||
|align="center"| ROM | |||
|} | |} | ||
==Components== | |||
{{Parts|7854}} | |||