Manual / Guide

EAI-1000 Diagnostic Routines (Section 8.11–8.13 and Diagnostic Box Reference)

This document is an extracted section (pages 8.25 onward) from the EAI-1000 reference manual covering the use of the diagnostic box and diagnostic software routines for troubleshooting the EAI-1000 hybrid analog computer. It describes the diagnostic box hardware — a 40-way flat-cable peripheral that replaces the HCI microprocessor card to isolate faults — and provides a numbered test matrix covering data bus/RAM storage, keyboard reading, device selection for the analog bus, A/D conversion, and the display panel. Each test entry specifies the switch settings ([AB], [CD], [EF]), the pass/fail criteria observable via oscilloscope or the indicator register, and details on chip-level failure modes (IC42, IC38, IC35, RAM chips 8111/8085/8212, EPROMs, and TTL buffers).

Manufacturer: EAI
System: EAI-1000
Type: Manual / Guide
Language: English
Learning track: machine reference
Pages: 13

EAI-1000
EAI
diagnostics
troubleshooting
microprocessor interface
analog-digital conversion

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8.11 8.12 Page 8.25 How to Troubleshoot the EAI-1000 Using Diagnostic Routines The diagnostic routines exist as a program module which can be used in a standard HCI installation. The HCI board complete with diagnostic program module is also mounted in a "diagnostic box" containing switches and indicator lamps which are extended from the HCI and replace the standard HCI LED indicators and control Switches. The diagnostic box is connected to the EAI-1000 by means of a 40 way flat strip cable. The cable plugs into the microprocessor card socket. Thus it replaces the microprocessor card and immediately seperates the two main possible areas of malfunction,. viz. the microprocessor board and control board. ; . Use of Diagnostic Routines This diagnostic program is most effectively used in conjunction with the preceeding descriptions of section 8. The objective of the diagnostics is to offer a pass/fail test where possible. This is not always possible as a large portion of the functions of the microprocessor are "write" functions and there is no facility to test for successfull operation other than by operator observation either visually in tests of the display or with an oscilloscope. All such write or read diagnostics are continuous loop operations so that they can be synchronously displayed on an oscilloscope by triggering on the appropriate chip select. The tests are arranged such that no test requires the successful operation of functions to be tested later. Unless the operator is sure of the appropriate test, he should start from the initial test and continue through successive tests until a fault is observed. TERMINOLOGY The terminology relating to integrated circuits, integrated circuit pin indentification and switch nomenclator for the HCI and diagnostic box is defined on page 1 of the quick reference "EAI-1000 diagnostic" brochure. Page 8.26 The following 7 fault areas are covered: 8.12.1 8.12.2 8.12.3 8.12.4 8.12.5 8.12.6 8.12.7 8.13 Data Bus/Program Storage/Ram storage Keyboard reading Device selection for access to analog bus A/D conversion Display Mode Control (no diagnosties - see section 8.7) Overload monitoring (no diagnostics - see section 7.1) Data Bus/Program Storage/Ram Storage Faults If an EAI-1000 is malfunctioning because of a failure of DATA BUS peripheral/program storage or RAM storage the insertion of the diagnostic box itself may indicate the problem. The user should note that the diagnostic box will run the standard EAI-1000 program when switch [A] is set to zero. In the instance that the standard program run from the diagnostic box does not operate the machine effectively the control board ata bus may be the cause of the problem or the data bus buffers IC42 or IC38. In this case the user should start with the diagnostic box self test diagnostics, which will verify the data bus buffers 1C42 and 1C38. If the diagnostic routines are executed correctly, this indicates that the fault lies in the control board section of the data bus or associated chip: select decoders. The diagnostics are: 1) Test of diagnostic box data bus {AB] = [10] or [11] or [12] 2) Diagnostic box program storage [AB] = [13] 3) Diagnostic box ram storage [AB] = [1E] See diagnostic "Description of Tests" for necessary details. Page 8.27 In the instance that the insertion of the diagnostic box solves the problem, the original microprocessor board would seem at fault. In this case the Eproms can be pulled from the socket and tested on the diagnostic box -using the appropriate ROM eheecksum diagnostic. In this case remember that the 2758 is a 1K byte device. Be careful to select not only the diagnostic for the correct device but also for the correet address range. If the Eproms are giving the correct checksums then a chip replacement proceedure is recommended. Replace chips on the microprocessor board in the following order of most probable failure and test the board after each replacement. 1. RAM chips (8111) 2. 8085 chip 3. 8212 chip 4. The three TTL chips; both 74LS138 and the 74LS04. If the standard program is not operating successfully, try to use the control board section of the data bus. This can be done by using a "display" diagnostic such as [21] [N1Ng9] [04]. In this diagnostic the value Nj,No are taken from switch pair [CD] and continuously written into the first and second seven segment display digits to the right of the decimal point. 1) CHIP SELECTS Only the following chip selects should be enabled. (81LS95 enables are active low) 1C38/1,19 1C41/1,19 DSW 6 (active low) NO OTHER CHIP SELECTS SHOULD MOVE OR BE ENABLING OTHER CHIPS 2) DATA BUS If the chip selects are as above but the display is not working or is showing incorrect characters then one can assume (providing the display is not malfunctioning) that one or more tristate outputs are not in the high inpedence state when they should be, therefore, the bus drive is faulty or a data bus peripheral IC input is leaking power onto the bus. Often the failing data bus line can be detected by the difference between the data on [C] or [D] and the display and in such a case the appropriate pin on the various chip outputs driving the data bus can be snipped until the display write routine is operating correctly. NOTE: BINARY VALUES GREATER THAN 9 WRITTEN TO THE DISPLAY CAUSE IT TO BLANK. - Page 8.28 8.13.1 Keyboard Reading The keyboard test [AB] = [21], [CD] = [ON], [EF] = [92] is quite self explanatory when used in eonjunciton with the explanation of operation found in section 8.03. The indicator register simply registers the column which the selected row [N] contacts upon keypress e.g., when switch pair [CD] contain the ROW address "0" (that is N=O) and the key "7" is pressed the light Lg will illuminate. 8.13.2 Device Selection for Access to Analog Bus The following switch settings will cause the selected field and function to be written to the respective registers IC18 and 1C22, 19 of the control board. The latches are independently addressed so diagnostic: [21] [XN] [09] loads IC18 with field address "N" [21] [Ny,N,] [OA] loads IC22, 29 with function address. (See diagnostic definitions for values Nj,N9). With the field registers set and examined with an oscilloscope _ to ensure it holds the correct field address, the diagnostic [21] [XX] [90] can be used to examine the field valid signal (see diagnostic definition) with an invalid field address ([CD] = [OF] for example) the status register should read [49]; D3 is "ON". The switches on the diagnostic box are best changed with "RESET" on the keyboard depressed. This ensures that no spurious signals occur which may inadvertently change the registers. , If the machine continually goes into halt a failed field valid signal trensistor may be giving a continuous output low. In this case the microprocessor cannot establish a maximum field number and will go into HALT mode. On the REV4 EPROM program for the standard 1000 the machine will-also write [.01] on the value display of the computer display panel. All HCI installations will also write this value on the display for this fault. The HALT state of the microprocessor can be deter- mined by examination of pins 33 and 29 of the microprocessor, both are "low" for HALT mode. On machines with RV3 program or lower the machine will execute "Reset" subroutine but then remain insensitive to all input of keyboard or serial communi- cation channel origin commands. Page 8.29 8.13. 3Analog to Digital Conversion The Analog input to the A to D converter is supplied by two operational amplifiers which control the gain and zero of the analog conversion to digital code. The actual analog input magnitude should be about 1.175 volts for a Reference Voltage (5 Volt) Input. The sequence of events is as follows: As a quick test of the A/D use diagnostic [22] [XX] [XX] - see diagnostic definitions. This test ensures that the A/D converter is giving a conversion. If the test fails or the conversion value is considered incorrect the remaining diagnostics should be used. 1) Cheek for the presence of a "start conversion" pulse with diagnostic [21][XX][00] A/D commence conversion mono- stable (IC35) is strobed which puts out a 2.0 microsecond (approximate) pulse. 2) Confirm that the A/D busy signal goes high when conver- sion is commenced. Use diagnostic [22] [XX] [XX]. Refer to the diagnostie definition. 3) Confirm that the A/D busy signal goes low for conversion complete and the microprocessor initiates a read of the high byte and then a low byte (A/D converter has output of twos complement, 13 bit word). Each of the read operations ean be tested using [21] [XX] [93] and [21] - [XX] [94]. the value obtained is displayed on the indicator register. 8.13.4 Display Panel The display is a simple memory mapped output port off the data bus. It is important to note that the data bus has two buffer stages. 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