WHAT WE DO ACISS Systems, Inc. Provides fully integrated information management and analysis solutions for the organization and dissemination of the vast amounts of information collected and utilized by law enforcement and other investigative organizations. Since 1984, ACISS Systems has worked to become an industry leader in developing scalable solutions to meet the unique needs of law enforcement. Our solutions are currently being utilized across the United States by agencies with deployments of all sizes, from a 5 officer narcotics unit to multi-agency, multi jurisdictional, statewide, and regional intelligence sharing initiatives.
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ACIS Software Traceability ACIS Software Traceability MASSACHUSETTS INSTITUTE OF TECHNOLOGY CENTER FOR SPACE RESEARCH CAMBRIDGE, MASSACHUSETTS 02139 REVISION LOG TITLE: DOC. Software Requirements Traceability Matrix 36-02402 Revision Date (mm/dd/yy) ECO No.
Page(s) Affected Reason Approval 01 -/-/-All PDR Release 02 05/18/95 - All CDR Release # Reference Requirement Description CEI Rev 06 Test Meth Team Test Objectives References to SRS Rev B CEI 3.1.3 Science Modes CEI 3.1.3.1 CCD Readout Modes 1 CEI 3.1.3.1-1 Simultaneous reading of a minimum of 6 data streams from spectral or imaging CCDs D5 QA Verify that all (6 imaging & 6 spectroscopy) CCD's are supplying data in timed exposure RAW mode. ¤ 3.2.2.3.19 Table 16 Table 17 D5 QA Verify that each science run is uniquely identified. ¤ 3.2.1.3.12 D5 QA Verify that the number of exposures is correct. ¤ 3.2.1.3.12 2 CEI 3.1.3.1-2 'Each channel shall collect data from CCDs at max rate 166,666 12 bit words / sec' T7 HW Design tests to verify that the CCDs can maintain the commanded data rate.
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Verify that the pixels are being copied to the FEP image memories, that overclocks are being extracted and stored, and that vertical retrace interrupts are being sent to the FEPs. TBD CEI 3.1.3.1 a) Timed Exposure Mode 3 CEI 3.1.3.1 a)-1 Be able to command exposure time between 0.1 and 10 sec R8 SW Inspect Detailed Design Specification to check that the times have been implemented.
¤ 3.2.2.3.1, Table 11 D5 QA Verify that command times of 0.1, 0.2, 5.0, 9.9 and 10.0 seconds are included in tests. Inspect ACIS time tags in their output streams.
¤ 3.2.2.3.1 4 CEI 3.1.3.1 a)-2 Image to Framestore operation take - 60 msec T7 HW This is not subject to verification by flight software. It will be tested by ACIS EGSE during hardware integration. N/A 5 CEI 3.1.3.1 a)-3.i Framestore read operation = one per 32 seconds. ¤ 3.2.3.3.1, Table 26 ¤ 3.2.3.3.18, Table 32 CEI 3.1.3.2 c) Bright Source Imaging Mode 38 CEI 3.1.3.2 c)-1 'Loss of temporal, spatial, or spectral resolution employed to fit telemetry rates' D5 SW During the CEI 3.1.3.2 a)-e.i) and ii) tests, verify that, if a FEP is unable to keep up with the input data rate, entire frames are skipped by all FEPs. ¤ 3.2.3.3.1, Table 26 ¤ 3.2.3.3.18, Table 32 39 CEI 3.1.3.2 c)-2 Processing shall terminate if output data rate exceeds 24 kbps S1 SW Refer to CEI 3.1.3.2 c)-1. N/A 40 CEI 3.1.3.2 c)-3 Processing shall not resume until buffer overflow is eliminated S1 SW Refer to CEI 3.1.3.2 c)-1.
N/A 41 CEI 3.1.3.2 c)-4 Buffer size and overflow actions TBD TBD SW Verify during CEI 3.1.3.2 a)-e.i) and CEI 3.1.3.2 a)- e.i) testing that FEP and BEP buffer sizes ( TBD until HW CDR) are adequate to meet CEI requirements. ¤ 3.2.2.3.1, Table 11 ¤ 3.2.2.3.11 ¤ 3.2.2.3.23, Table 24 CEI 3.1.3.2 d) Bright Source Spectroscopy Mode 42 CEI 3.1.3.2 d)-1 Provide specialized data compression for TGS observations A2 SW Verify two-exposure-time operation in timed-expo sure faint event mode during SW integration tests, using 'image loader' and test images (from CD-R set). ¤ 3.2.2.3.1, Table 11 ¤ 3.2.2.3.22, Table 22 43 CEI 3.1.3.2 d)-2 Compression shall preserve X-ray intensity as a function of position N/A N/A Since the compression is in the time domain, and is non-destructive, this requirement is automatically met.
N/A CEI 3.1.3.2 e) Calibration and Diagnostic Modes 44 CEI 3.1.3.2 e)-1 All calibration modes shall function when ACIS is at focus or next in line for focus D5 SW Verify that bias maps can be computed, and raw his togram mode executed in next-in-line mode (500 baud telemetry). ¤ 3.2.2.3.20, Table 18 ¤ 3.2.2.3.24, Table 25 45 CEI 3.1.3.2 e)-2 Full telemetry will be utilized D5 SW Verify that ACIS telemetry packets use optimal bit- packing. ¤ 3.2.1.3.10 D5 SW Verify that bias maps and raw pixels are compressed efficiently (see reference 1). ¤ 3.2.2.3.19, Table 20 ¤ 3.2.2.3.24, Table 25 ¤ 3.2.3.3.17, Table 30 D5 QA During all tests, tally the percentage of telemetry that is unused, i.e.
Contains inter-packet pad bytes. 46 CEI 3.1.3.2 e)-2-i 'Mode must provide information on system per formance, noise, CCD charge' D5 SW Verify that the calibration modes accurately report pixel and overclock values (raw mode) and their sta tistics (histogram mode) from test images (from CD- R via loader). ¤ 3.2.2.3.19, Table 20 ¤ 3.2.2.3.20, Table 18 47 CEI 3.1.3.2 e)-2-ii 'transfer efficiency, CCD Dark current, spectral resolution,' T7 SW Analyze test images using the 'image loader' & CD- R files.
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Verify that the resulting data packets are ade quate for science calibration, e.g. That the measured bias values and width of particular spectral lines is the same as that derived from the same data frames by the ACIS calibration team. ¤ 3.2.2.3.1, Table 11 ¤ 3.2.2.3.22, Table 22 48 CEI 3.1.3.2 e)-2-iii 'energy-to-pulse height gain, CCD quantum effi ciency, background event rate' T7 SW Analyze test images using the 'image loader' & CD- R files. Verify that the resulting data packets are ade quate for science calibration, e.g.
That the energy, QE, event rate, etc., of particular spectral lines is the same as that derived from the same data frames by the ACIS calibration team. ¤ 3.2.2.3.1, Table 11 ¤ 3.2.2.3.22, Table 22 49 CEI 3.1.3.2 e)-3 Mode shall be capable of full frame transmission D5 SW Conduct tests of raw mode timed-exposure and con tinuously clocked telemetry.
Verify that all pixels are being reported. Generals zero hour free download. ¤ 3.2.2.3.1, Table 11 ¤ 3.2.2.3.19, Table 20 ¤ 3.2.3.3.1, Table 26 ¤ 3.2.3.3.17, Table 30 50 CEI 3.3.10 Software will be compatible to AXAF-I IAW Science Instrument ICD S1 - See below. N/A CEI 3.7.5 Flight Software Subsystem CEI 3.7.5.1 General 51 CEI 3.7.5.1-1-i 'SW will conform to CQ-5330.1, MM-8075.1 and NMI-2410.6' R8 QA This is ensured by following the directives in the ACIS Software Quality Assurance Plan.
¤ 1.2 52 CEI 3.7.5.1-1-ii Implement SI control and redundancy manage ment D5 QA This is not subject to verification by flight software, which is unaware of redundancy state. It will be tested by ACIS EGSE during hardware integration. N/A 53 CEI 3.7.5.1-2 Provide for on-orbit changes and memory dump capability D5 SW Verify the action of the code patch and memory load/ dump commands. ¤ 3.2.8 (memory) ¤ 3.2.11 (patch) V4 QA Verified that all memories can be examined and mod ified at their address limits. ¤ 3.2.8 (memory) ¤ 3.2.11 (patch) 54 CEI 3.7.5.1-3-i Implement CCD readout modes D5 SW/ QA Conduct tests of all science operating modes.
¤ 3.2.2 (timed) ¤ 3.2.3 (continuous) 55 CEI 3.7.5.1-3-ii Implement modes of section 3.1.3 S1 QA Ensure that tests have been performed in all imple mented science modes. ¤ 3.2.2 (timed) ¤ 3.2.3 (continuous) CEI 3.7.5.3 Functions CEI 3.7.5.3-a Executive 56 CEI 3.7.5.3-a(1) Interrupt Service R8 QA Review SI code to ensure that interrupts are handled. N/A 57 CEI 3.7.5.3-a(2) Power-on/initialization D5 HW This is not subject to verification by flight software.
It will be tested by ACIS EGSE during hardware integration. N/A 58 CEI 3.7.5.3-a(3) Scheduler R8 QA Review SI code to verify the presence of a scheduler. N/A 59 CEI 3.7.5.3-a(4) Mode control N/A N/A Redundant requirement. Refer to CEI 3.1.3. N/A 60 CEI 3.7.5.3-a(5) Service routine R8 QA Verify ACIS memory examination and modification capabilities.
¤ 3.2.8 61 CEI 3.7.5.3-a(6) Utility D5 QA Verify software housekeeping commands and telem etry. ¤ 3.2.9 CEI 3.7.5.3-b Communication 62 CEI 3.7.5.3-b(1) Command Processing R8 QA Redundant requirement.
Refer to TRW 3.6.1.1.1.2. N/A 63 CEI 3.7.5.3-b(2) Telemetry control processing R8 QA Redundant requirement. Refer to CEI 3.1.3. N/A CEI 3.7.5.3-c Redundancy Management 64 CEI 3.7.5.3-c(1) Fault detection and isolation TBD QA Refer to SW FMEA 36-01104. N/A 65 CEI 3.7.5.3-c(2) Periodic Self Test D5 QA Needs to be designed.
TBD 66 CEI 3.7.5.3-c(3) Hardware reconfiguration R8 QA This is not subject to verification by flight software. It will be tested by ACIS EGSE during hardware integration. N/A CEI 3.7.5.4 Fault Management 67 CEI 3.7.5.4-1-i Capable to detect and isolate faults TBD QA Refer to SW FMEA 36-01104. N/A 68 CEI 3.7.5.4-1-ii Reconfigure redundant units D5 GSE This is not subject to verification by flight software. It will be tested by ACIS EGSE during hardware integration. N/A 69 CEI 3.7.5.4-1-iii Report status D5 SW Verify that reboot status is accurately reported in test telemetry. ¤ 3.2.9.3.5, Table 64 QA Verify that DEA software housekeeping is accurately reported.
¤ 3.2.10.3.1, Table 66 70 CEI 3.7.5.4-1-iv Provide sufficient data to OTS to verify instru ment operation TBD This is not subject to verification by flight software. It will be tested by ACIS EGSE during hardware integration. N/A 71 CEI 3.7.5.4-1-v Provide sufficient data to ground controller in critical situations TBD This is not subject to verification by flight software. It will be tested by ACIS EGSE during hardware integration. N/A CEI 3.7.5.5 Periodic Self Test 72 CEI 3.7.5.5-1 Provide for self test of computational elements D5 SW Verify the action of raw frame (in timed-exposure and continuous modes) and histogram commands (timed-exposure mode only).
¤ 3.2.2.3.19 ¤ 3.2.2.3.20 ¤ 3.2.3.3.17 CEI 3.7.6 Data and Command Subsystem 73 CEI 3.7.6-1 AXAF-I Observatory, SI ICD, TRW, Oct 11 1994. Command formats shall be compatible with AXAF-I to SI ICD S1 - See below. N/A # Reference Requirement Description AXAF-I Observatory - SI ICD Sep 23 1993 Test Meth Team Test Objectives References to SRS, Rev B TRW 3.6.1 Commands TRW 3.6.1.1 SI Commanding 74 TRW 3.6.1.1-a-2 Stored commands for 72 hrs - 2000 command words I3 ASC QA Memo from Paul Plucinsky, ASC, regarding ACIS stored command sizes, June 1994. Verify that the science command and parameter block lengths do not violate the assumptions used in reference. N/A TRW 3.6.1.1.1 ACIS-OBC Ground Software TRW 3.6.1.1.1.1 Buffer size 75 TRW 3.6.1.1.1.1-a-1 ACIS Commands stored in OBC not exceed 10K bytes I3 ASC QA Verify that the science command and parameter block lengths do not violate the assumptions used in reference 1. N/A TRW 3.6.1.1.1.2 Command Formats TRW 3.6.1.1.1.2-1. ACIS commands received by OBC shall con sist of.
76 TRW 3.6.1.1.1.2-1.a Table loads in format of Table 3.6-1 + a com mand D5 EGSE This is not subject to verification by flight soft ware. It will be tested by ACIS EGSE during hardware integration. ¤ 3.1.4.1 (OBC com mand interface) 77 TRW 3.6.1.1.1.2-2. Table loads shall be LT 513 bytes (TBR) D5 QA Verify that ACIS can accept table loads that contain less than 512 bytes of data.
¤ 3.1.4.1 (OBC com mand interface) 78 TRW 3.6.1.1.1.2-3. SW Command shall initiate transmission of a specific ACIS table. TBD EGSE This is not subject to verification by flight soft ware.
It will be tested by ACIS EGSE during hardware integration. N/A 79 TRW 3.6.1.1.1.2-4. OBC shall issue the ACIS table load as regular 16 bit commands. TBD QA Verify that ACIS SW can accept all valid com mands, and reject invalid commands, with the appropriate software housekeeping responses. ¤ 3.1.4.1 (OBC command interface) ¤ 3.2.9.3.1 (com mand echoing) ¤ 3.2.9.3.6 (ACIS software aborts) 80 TRW 3.6.1.1.1.2-4.-i. To the RCTU address assigned to ACIS TBD EGSE This is not subject to verification by flight soft ware. It will be tested by ACIS EGSE during hardware integration.
N/A TRW 3.6.1.1.1.3 ACIS operations 81 TRW 3.6.1.1.1.3.1 ACIS commanded identically in standby and normal observation modes: N/A HW This is not an ACIS requirements. N/A TRW 3.6.1.1.1.3.2 Memory Uplink Mode: TRW 3.6.1.1.1.3.2-a-1 During large amounts of ACIS memory trans fers.
82 TRW 3.6.1.1.1.3.2-a-1-i ACIS and OBC shall be configured to pass 512 byte packets directly to ACIS I3 QA Verify that ACIS can be loaded by 512 byte packets. ¤ 3.2.12 (uplink load command) 83 TRW 3.6.1.1.1.3.2-a-1-ii Packets can be temporarily buffered N/A - This is an OBC requirement. It is not subject to verification by ACIS flight software. N/A 84 TRW 3.6.1.1.1.3.2-a-2 Memory transfers and other OBC uplinks can be mixed TBD EGSE This is an OBC requirement.
It is not subject to verification by ACIS flight software. N/A 85 TRW 3.6.1.1.1.3.2-b-1 This mode is not a special mode for OBC TBD - This is an OBC requirement. It is not subject to verification by ACIS flight software.
N/A TRW 3.6.1.2 ACIS Processor Loads 86 TRW 3.6.1.2-a-1 Observatory memory capable of loading data into ACIS. N/A - This is an OBC requirement. It is not subject to verification by ACIS flight software. N/A 87 TRW 3.6.1.2-a-2 Memory load on the order of 32K by 24 bit. D5 QA This is an OBC requirement. It is not subject to verification by ACIS flight software.
N/A TRW 3.6.2 SI Telemetry TRW 3.6.2.1 SI Science Data 88 TRW 3.6.2.1-a-1 Data transmitted to ground via major frames IAW Fig 3.6-1 and 3.6-2 S1 QA This is not subject to verification by flight soft ware. It will be tested by ACIS EGSE during hardware integration.
N/A 89 TRW 3.6.2.1-a-2 Major Frame shall provide mean science + header data rate of 24 kbps D5 SW Verify that the BEP can keep up with 24Kbaud output rate. ¤ 3.1.4.4 (modes and data rates) D5 QA Verify ACIS performance at 24 Kbaud output rate. ¤ 3.1.4.4 (modes and data rates) 90 TRW 3.6.2.1-a-3 Major frame called science data packet and does not include aspect data N/A - This is not subject to verification by flight soft ware. N/A 91 TRW 3.6.2.1-a-5 Science packets collected in serial 8 bit words by RCTU N/A HW This is not subject to verification by flight soft ware.
It will be tested by ACIS EGSE during hardware integration. N/A 92 TRW 3.6.2.1-b-1 Data packets shall include 24 word (192 bits) header IAW Table 3.6-2 D5 EGSE This is not subject to verification by flight soft ware. N/A 93 TRW 3.6.2.1-b-2 Header supplied by observatory merged with data in CDM N/A - This is not subject to verification by flight soft ware. N/A 94 TRW 3.6.2.1-b-2-i Definition of Earth Centered Inertial Coordi nate system N/A - This is not subject to verification by flight soft ware. N/A 95 TRW 3.6.2.1-c-1 Telemetry modes 1 and 2 have identical formats IAW Fig 3.6-2 D5 EGSE Construct tests to verify that ACIS telemetry packets are identical in the two modes.
¤ 3.1.4.3 (telemetry formats) 96 TRW 3.6.2.1-c-2 Mode 1 ACIS data mode @ 24 kbps + 500 bps of HRC cal data D5 QA Construct tests to verify that ACIS can gener ate telemetry at 24 kbps. ¤ 3.1.4.4 (modes and data rates) 97 TRW 3.6.2.1-c-2 Mode 2 HRC data mode @ 24 kbps + 500 bps of ACIS cal data D5 QA Construct tests to verify that ACIS can gener ate calibration data at 500 bps.
¤ 3.1.4.4 (modes and data rates) TRW 3.6.2.2 SI Engineering Data 98 TRW 3.6.2.2-1 SI provide housekeeping data in operational mode to RCTU D5 HW Hardware housekeeping is sent directly to the RCTU and is not subject to verification by flight software. Construct tests to verify the content of DEA housekeeping telemetry. ¤ 3.1.4.5 (discrete commands) ¤ 3.2.10.3 (DEA housekeeping) 99 TRW 3.6.2.2-1-i Housekeeping data rate 512 bits per every major data frames (approx.
32 secs) D5 QA Hardware housekeeping is sent directly to the RCTU and is not subject to verification by flight software. Construct tests to verify the bit rate of DEA housekeeping telemetry.
¤ 3.1.4.5 (discrete commands) ¤ 3.2.10.3 (DEA housekeeping) 100 TRW 3.6.2.3-2 ACIS put data on AXAF-I data bus via RCTU N/A HW/ SW This is not subject to verification by flight soft ware. N/A TRW 3.6.2.3 SI Calibration Data 101 TRW 3.6.2.3-1 SI provide calibration data =.5 kbps of insert field of major data frame D5 SW Verify that raw histogramming mode is intended to work at 500 bps. ¤ 3.1.4.3 (telemetry formats) D5 QA Conduct a test of raw histogramming mode at 500 bps. ¤ 3.1.4.4 (modes and data rates) 102 TRW 3.6.2.3-1-ii Calibration data taken not at telescope focus D5 SW Conduct a test of raw histogramming mode at 500 bps. Verify that full histograms can be read out at that speed.
¤ 3.1.4.4 (modes and data rates) 103 TRW 3.6.2.3-2 Data shall include 2 word header/major data frame I3 QA Verify inclusion of latched microsecond clock in first 32 bits of ACIS data within each sci ence frame. ¤ 3.1.4.6 (ACIS timestamps) TRW 3.6.2.4 Telemetry Synchronization 104 TRW 3.6.2.4-1 CCDM shall provide prime and redundant major frame pulses to FPSIs N/A HW This is not subject to verification by flight soft ware. N/A 105 TRW 3.6.2.4-1-i Major frame pulses appear at the beginning of telemetry major frame N/A This is not subject to verification by flight soft ware. N/A TRW 3.6.2.5 Telemetry Mode Change 106 TRW 3.6.2.5-a CCDM command via serial command channel to indicate telemetry mode change D5 QA Verify that ACIS will accept serial CCDM commands.
¤ 3.1.4.4 (modes and data rates) 107 TRW 3.6.2.5-b Mode change occurs at issuance of next major frame sync signal. I3 QA Verify that ACIS will not drop telemetry dur ing a mode change. ¤ 3.1.4.4 (modes and data rates) TRW 3.6.3 Central Timing 108 TRW 3.6.3-a-1 AXAF-I central clock relatable to UTC within 100 microsecs N/A - This requirement does not concern ACIS flight software. N/A 109 TRW 3.6.3-a-2 AXAF-I clock resolution of 1 microsec N/A - This requirement does not concern ACIS flight software. N/A 110 TRW 3.6.3-c-1 CCDM provide prime and redundant 1.024 MHz clocks to FPSs N/A HW This requirement does not concern ACIS flight software. N/A 111 TRW 3.6.3-c-1-i '1.024 MHz clocks to be used by 'Microsecond Counter'in the SIs' N/A HW This requirement does not concern ACIS flight software. N/A 112 TRW 3.6.3-c-2 X-Ray event time tag with count from Micro second Counter R8 QA Verify that the correct microsecond time tags are included in timed and continuous exposure telemetry packets.
Table 21 (timed exposures) Table 33 (continu ous clocking) 113 TRW 3.6.3-c-2-i Time tag indicates elapsed time from beginning of major frame pulse D5 SW Verify that the correct microsecond time tags are included in timed and continuous exposure telemetry packets. Ees software free download. ¤ 3.1.4.6 (ACIS timestamps) 114 TRW 3.6.3-c-3 Resolution of Microsecond Counter specified in ACIS CEI Specification.
R8 QA see CEI 3.1.3.2 a)-d-i and ii. N/A 115 TRW 3.6.3-d-1 CCDM provide redundant science header pulses at begin of every Major frame N/A - This requirement does not concern ACIS flight software.
N/A 116 TRW 3.6.3-d-1-i and every 2.05 seconds thereafter. N/A - This requirement does not concern ACIS flight software.
Top 4 Download periodically updates software information of acis full versions from the publishers, but some information may be slightly out-of-date. Using warez version, crack, warez passwords, patches, serial numbers, registration codes, key generator, pirate key, keymaker or keygen for acis license key is illegal. Download links are directly from our mirrors or publisher's website, acis torrent files or shared files from free file sharing and free upload services, including Rapidshare, MegaUpload, YouSendIt, Letitbit, DropSend, MediaMax, HellShare, HotFile, FileServe, LeapFile, MyOtherDrive or MediaFire, are not allowed! Your computer will be at risk getting infected with spyware, adware, viruses, worms, trojan horses, dialers, etc while you are searching and browsing these illegal sites which distribute a so called keygen, key generator, pirate key, serial number, warez full version or crack for acis. These infections might corrupt your computer installation or breach your privacy. Acis keygen or key generator might contain a trojan horse opening a backdoor on your computer.
Version 2017 1.0 / July 2016 (and ), and Website The 3D ACIS Modeler ( ACIS) is a developed by (formerly Spatial Technology), part of. ACIS is used by many software developers in industries such as (CAD), (CAM), (CAE), architecture, engineering and construction (AEC), (CMM), and shipbuilding. ACIS provides software developers and manufacturers the underlying 3D modeling functionality. ACIS features an openC architecture that enables robust, 3D modelling capabilities. ACIS is used to construct applications with hybrid modeling features, since it integrates, and functionality with both, and a rich set of geometric operations.
Contents. History As a geometric kernel, ACIS is a second generation system, coming after the first generation. There are several versions about what the word ACIS actually stands for, or whether it is an at all. The most popular version is that ACIS stands for Alan, Charles, Ian's System (Alan Grayer, Charles Lang and Ian Braid as part of Three-Space Ltd.), or Alan, Charles, Ian and Spatial (as the system was later on sold to Spatial Technology, now ). However, when askedthe creators of ACIS would simply suggest that its name was derived from (See also ). In 1985 Charles Lang and Ian Braid (creators of and Romulus-D) formed Three-Space Ltd. (, ) which had been retained by Dick Sowar's Spatial Technology (which had been founded by Sowar in 1986) to develop the ACIS solid modeling kernel for Spatial Technology's Strata CAM software.
The first version of ACIS was released in 1989 and was quickly licensed by for integration into its ME CAD software. In late 2000, around the time when Spatial was acquired by, the ACIS file format changed slightly and was no longer openly published. Architecture A is a functionally specialized unit of software—a collection of software items (functions, classes, etc.) grouped together to serve some distinct purpose.
It serves as a constituent part of a whole software system or product. A product is one or more software components that are assembled together and sold as a package. Components can be arranged in different combinations to form different products. The ACIS product line is designed using software component technology, which allows an application to use only the components it requires. In some cases, more than one component is available (either from Spatial or third party vendors) for a given purpose, so application developers can use the component that best meets their needs. For example, several rendering components are available from Spatial, and developers use the one that works best for their platform or application.