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Motorola 68881 - Wikipedia, the free encyclopedia The Motorola 68881 was a floating-point coprocessor chip that was utilized in some computer systems that used the 68020 or 68030 CPU. The addition of the 68881 chip added substantial cost to the computer, but added a floating point unit that could rapidly perform floating point math calculations. Notable computers including 68881 or 68882 FPUs included the Sun 3 from Sun Microsystems, the Macintosh II family of computers from Apple Computer, and the Commodore Amiga 3000. en.wikipedia.org /wiki/68881   (443 words)

RT PC Advanced Processor Model 115 In this mode, communication between the 68881 and CPU takes place by reading and writing to the 68881's registers, called Coprocessor Interface Registers (CIRS) These are basically registers that you map into the CPU's address space, much like you map a PIA (6520) registers into the 6502's address space. Another interesting feature of the 68881 is that it can be configured to work with an 8 bit data bus, with some decrease in performance as compared to its default 32 bit data bus configuration-- of course. Additionally, the 68881 can have a separate clock attached to it, running at either a faster or slower speed than the rest of the system, due to the asynchronous nature of the chip. www.gilanet.com /ohlandl/6152/RT-PC_Adv_Processor_115.html   (496 words)

compile_mac The 68K case is further complicated by the fact that code may or may not compiled to use a 68881 math coprocessor. In coding a Macintosh user function, if you make a pointer by dereferencing a handle argument, you should dereference it again after calling back to a function internal to MacAnova since its location in memory may have been changed by the call back. The resource type should be 'MV6c' or 'MV6n', depending on whether you are compiling to use a 68881 math coprocessor. www.stat.umn.edu /macanova/html_help/node563.htm   (1099 words)

Why QuickBASIC's "Generate 68881 Code" Option Dims Out This feature prevents you from generating 68881 instructions for a machine that could not have this chip. A program compiled with the 68020 and 68881 options requires the presence of the 68881 math-coprocessor chip at run time. The 68881 chip must not be on an accelerator board; it must be built into the Macintosh as standard equipment. support.microsoft.com /kb/37301   (192 words)

Using and Porting the GNU Compiler Collection (GCC) - M680x0 Options This results in code which can run relatively efficiently on either a 68020/68881 or a 68030 or a 68040. The generated code does use the 68881 instructions that are emulated on the 68040. The generated code does use the 68881 instructions that are emulated on the 68060. www.cs.queensu.ca /software_docs/gnudev/gcc/gcc_17.html   (630 words)

68881 co-processor - AtariAge Forums I was wondering if anyone knows of any polygonal games that use the 68881 or 68882 if available to increase their speed as well. In F030 and TT, the FPU works as a co-processor, and in that respect, the 68881 and 68882 is 100% compatible. I started doing the research becuase after discovering that it was a 68882 instead of 68881 chip, I attempted to load the 68882 version of the Phoenix Object renderer and it crashes with about a dozen bombs. www.atariage.com /forums/index.php?showtopic=77295   (1914 words)

[No title]   (Site not responding. Last check: 2007-11-06) With the '030 in connection to an st-compatible 68881 card, the internal caches of the cpu have to be switched off, due to a (documented) bug in the caching logic of the 68030. I make use of the fact that the 68881 handles floating point exceptions in a self consistant manner: Overflows are represented by a signed infinity, operations leading to undefined results like 0/0 will be represented by a NAN (not a number) symbol. There is no exit on the appearence due to floating point exceptions, due to two reasons: (a) the 68881 is able to use these symbols in a logical and self consistent manner in the computations. www.umich.edu /~archive/atari/Gnustuff/Tos/881/aa.gnu.881   (541 words)

kbAlertz: (65942) - If a program is compiled with the Generate 68881 Code option under QuickBasic (b) (binary math ...   (Site not responding. Last check: 2007-11-06) kbAlertz: (65942) - If a program is compiled with the Generate 68881 Code option under QuickBasic (b) (binary math version) and it attempts to raise 0 (zero) to the power of 0 (zero), the program will return 0 (zero) instead of the correct answer, which is 1. If a program is compiled with the "Generate 68881 Code" option under QuickBasic (b) (binary math version) and it attempts to raise 0 (zero) to the power of 0 (zero), the program will return 0 (zero) instead of the correct answer, which is 1. If the sample program below is compiled with the "Generate 68881 Code" option (from the Options command in the Run menu of QuickBasic binary math version), the program will return an erroneous result (0). www.kbalertz.com /kb_65942.aspx   (504 words)

BUG: Divide by Zero Hangs on SE/30 If Compiled w/ 68881 Option Dividing by zero in a Macintosh QuickBasic (b) (binary math version) program compiled with the "Generate 68881 Code" option can cause a Macintosh SE/30 (with a 68881 installed) to hang. The problem does not occur on a Macintosh II computer with a 68881 installed. The following program, when compiled with the "Generate 68881 Code" option (from the Options command in the Run menu) causes the computer to hang after a key is pressed. support.microsoft.com /kb/65941   (243 words)

68881 Zip Code Detailed Profile - residents and real estate info Vehicles available in 68881 zip code in owner-occupied houses: Estimate of home value of owner-occupied houses in 2000 in zip code 68881: Additional information about hotels, doctors, dentists, jobs, apartments, real estate, travel attractions, weather, and many interactive features are coming soon. www.city-data.com /zips/68881.html   (105 words)

sun3.html Sun Microsystem's was an early adopter of the powerful Motorola 68000 series which were utilized in Sun 3 workstation line. Most of the Sun 3 Series uses a 68020 with a 68881 math coprocessor, while later models use a 68030 with a 68882 math coprocessor. A propietary MMU is used for the 68020 dubbed the Sun-MMU, while the 68030 use the built-in MMU. www.angelfire.com /ca2/tech68k/sun3.html   (662 words)

kbAlertz: (71240) - Below is an example of a problem using the STRING$(32767,32) function when compiled with the ... Below is an example of a problem using the STRING$(32767,32) function when compiled with the Generate 68020 Code or Generate 68881 Code option. When you compile without the Generate 68020 Code or Generate 68881 Code options, or if you changed the string assignment to a$ = STRING$(32766,32), no problem occurs. When tested with System version 6.04 using QuickBasic version 1.00, a system bomb ID=3 occurs when the program is compiled with either the 68020 or 68881 options. kbalertz.com /kb_71240.aspx   (611 words)

[No title]   (Site not responding. Last check: 2007-11-06) This state could be either the 68881 or * the fpa. This variable * cause all the appropriate code to be included. It is defined * here instead of in the makefile since we do not know for sure * that an 68881 or fpa will be in the system. www.cs.cmu.edu /~jh6p/classes/studio/gcc-2.5.8/include/sun3x/reg.h   (358 words)

[No title] J100 (pins 5-6 of a block on the left side, beyond the 68881) "Cache disable". UNJUMPED J2505 (pins 7-8 of a block on the left side, beyond the 68881) Jump for a type-1 Ethernet transceiver, unjump for a type-2. J3102 (pins 3-4 of block on the left side, beyond the 68881) Jump for 4M CPU. jedi.ks.uiuc.edu /~johns/links/comp/smcchw.txt   (12922 words)

Allen Systems - 68332 Based Single Board Computer Resources on the card can be considered as five separate subsections: 68332 microcontroller, memory section, 68881 FPU (optional), processor supervisory circuit, 88C681 DUART, and daughterboard expansion connector. A 2 by 20 pin header is available for adding custom user circuitry or as a connection point for the optional daughterboards. Note that this socket is unpopulated as the board is shipped from the factory. www.allen-systems.com /cp332.htm   (323 words)

Sun Archive System Overview A few later models had 68030's, but by that time Sun was already moving toward SPARC processors. All models either have a 68881 or 68882 FPU installed stock or at least have a socket for one. A version of the 3/60 with no onboard framebuffer and limited to 12M of RAM (4M of 256K SIMMs and 8M of 1M SIMMs). www.sun3arc.org /text/general.phtml   (802 words)

[No title]   (Site not responding. Last check: 2007-11-06) All registers that the compiler knows about must be given numbers, even those that are not normally considered general registers. For the 68000, we give the data registers numbers 0-7, the address registers numbers 010-017, and the 68881 floating point registers numbers 020-027. The 68881 registers can't hold anything if 68881 use is disabled. www.cs.cmu.edu /~jh6p/classes/studio/gcc-2.5.8/config/m68k/m68k.h   (3598 words)

68882 FPU in a Sun 3 System:   (Site not responding. Last check: 2007-11-06) Fortunately the 68882 FPU and the 68881 FPU are functionally and pin-out compatible. Just take the 68881 out of it's socket and put a 68882 in. The removal of the CPU board (501-1208 4MB Sun 3004 CPU, 16.67MHz 68881) went smoothly, sorry, I didn't take any pictures (I'll have to do so next time). www.obsolyte.com /sun3/68882.html   (355 words)

Technical Note OS510: Math Function Q&As Our program generates NAN(030) on a 68040 but generates NAN(255) on a 68030 with a 68881 FPU, causing it to work differently on a Macintosh Quadra than on a Macintosh IIfx. Is this a bug or are there supposed to be differences in numerical results between the emulated code and the hardware code? What can be a bit puzzling is why you'd get such a return if you're compiling with the 68881 flag. developer.apple.com /technotes/os/os_510.html   (341 words)

FBENCH: Floating Point Benchmark This was compiled to call subroutines for floating point, and the machine contained an 80287 which was used by the subroutines. I was unable to determine whether SANE was using the 68881 chip or not. Since the coprocessor was present, the library is supposed to use in-line floating point code. www.fourmilab.ch /fbench/fbench.html   (1405 words)

Linux on a Q950? No timing differences seemed to lurk in the 68881 versus non-68881 version. Therefore if you've an old mac hosting squeak that you could host linux on, then you would be better off, since a 42% improvement performance lurks. I'll look at posting the 68881 version of the macos squeak later this week. www.smalltalkconsulting.com /html/linuxOnAQ950.html   (615 words)

Westerville, NE 68881   (Site not responding. Last check: 2007-11-06) Westerville, NE Nebraska 68881 Current and Forecast WeatherWesterville, NE Nebraska 68881 Current and Forecast Weather and Pollen Forecast from Pollen.com. Westerville, Nebraska (68881), Lat: 41.40N, Lon: 99.38W ICAO Used: KBBW. Westerville, Nebraska (68881), Lat: 41.40N, Lon: 99.38W Wx Zone: NEZ038 ICAO Used: KBBW. www.bigletterlist.net /z/NE-68881.htm   (627 words)

Macintosh IIx - Wikipedia, the free encyclopedia The Macintosh IIx was introduced by Apple in 1988 as an incremental update of the original Macintosh II model. It replaced the Motorola 68020 CPU and 68881 FPU of the II with a 16 MHz 68030 CPU and 68882 FPU (running at the same clock speed); and the 800 KB floppy drive with the 1.44 MB SuperDrive. The initial price of the IIx was US$7,769 or $9,300 for a version with the 40 MB hard disk drive. en.wikipedia.org /wiki/Macintosh_IIx   (196 words)

MicroMac Thunder Accelerator MicroMac's Thunder accelerator is the perfect hardware upgrade for your Macintosh LC, LCII (Performa 400/405/410/430) or Color Classic computer. The Thunder accelerator features a 32MHz 68030 processor and a 16MHz 68881 FPU (math coprocessor) to speed up CPU performance and math calculations. With the Thunder accelerator you are able to enjoy a new level of performance from your Macintosh. www.micromac.com /products/thunder.html   (385 words)

68881 - Cherry Red Silk Table Lamp Shades (via CobWeb/3.1 planetlab1.cs.virginia.edu)   (Site not responding. Last check: 2007-11-06) 68881 - Cherry Red Silk Table Lamp Shades (via CobWeb/3.1 planetlab1.cs.virginia.edu) Sized 8" top x 16" bottom x 12" height; 7" top x 14" bottom x 11" height; 6" top x 12" bottom x 9" height; standard chip on 4" top x 8" bottomm x 7" height. Standard finial top except for the stand bulb clip on with a height of 7". www.specialtylampshades.com.cob-web.org:8888 /catalog/68881_-_cherry_red_silk_table_lamp_shades_4171827.htm   (80 words)

Bass Fishing Report #68881 for Keowee, South Carolina on 2/23/2002 Bass Fishing Report #68881 for Keowee, South Carolina on 2/23/2002 Fishing Report #68881 for Keowee, South Carolina on 2/23/2002 Had a club tournement Saturday caught 5 spots around Crowe Creek. www.wmi.org /bassfish/reports/68881.htm   (53 words)

Atari Ghostscript Files   (Site not responding. Last check: 2007-11-06) gs020881.zoo - This contains an executable of GS 2.61 compiled for the 68030 and the 68881 coprocessor, intended for the TT. gs68881.zoo - This executable of 2.61 supports 68000 machines with 68881 coprocessors. This should include upgraded ST, and STE machines. godel.ph.utexas.edu /Members/timg/gs/WhichFiles.html   (457 words)

comp.sys.3b1 FAQ part1 - 5.2. Can I put a 68881 math coprocessor in my machine?   (Site not responding. Last check: 2007-11-06) Can I put a 68881 math coprocessor in my machine? AT&T had listed a 68881 feature as being available for the UNIX PC, but it was never fully developed. Parent document is top of "comp.sys.3b1 FAQ part1" unixpc.taronga.com /faq/part1/faq-doc-41.html   (113 words)

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