carter@cat23.cs.wisc.edu (Gregory Carter) (04/01/91)
The Mega STE Revision B motherboard: -------------------------------------------------------------------------- | BACK VELCRO LITHIUM BAT | | | | 8530 FDC(UNDERNEATH HDC) | | POWER SUPPLY | | BIG SQUARE CHIP??? HARD DISK | | <-- VME CAGE ENTRANCE--> CONTROLLER | | VME SUPPORT CHIPS UNIT SELECTOR | | | | 68000 MMU?? 4 | | SIMM | | ACIA's 68881 MODULES | | GLUE?? (UNDER HARD DISK)| | | | | | 2 EPROMS/TOS | | FLOPPY DISK | |SERIES OF UNKNOWN CHIPS FRONT 8 DIP SWITCH BANK | -------------------------------------------------------------------------- Well, this is preliminary, but its the best I could do, I have an early machine, amazingly NO JUMPERS anywhere, the board is very clean. Everything is pretty much socketed like in most early machines. There were quite a few chips I didn't understand, I didn't for example see the 68901. It must have been on the board somewhere, the MB is huge, though! I thought it was hilarious that I own the only ATARI machine with BUILT in VELCRO! The 10 Year Lithium battery is held in place by a big piece of velcro where the scsi would be on the TT. I didn't think I had a 68881, but I do. WHY, and if it will ever be of any use, who knows. I think Atari could have saved themselves some money though by dumping the blitter and math coprocessor. It really is stupid on a 16MHz M68000. The FDC is socketed underneath the Hard Disk Controller, and the drive I have is an EPSON drive, very quite, nice. I couldn't tell if it was an 1.4 meg drive or not, I forgot the serial number. I bet it isn't though. Lots of conspicuous large SQUARE chips on the board, many I do not know anything about. I suspect some were VME support chips. Others..WHO KNOWS. Ripping the machine open is not too hard...amazing, the hard disk is attached sort of half hazard. It SITS ontop of the SIMMS! You have to be careful NOT to squish your SIMMS or BREAK them off when you set the DRIVE BACK IN THE CASE. ONE screw on the bottom of the machine detaches the hard disk. The ribbon cable is quite long, so that you can pull the drive out and detach it. You have a double power cable extender that you must detach from the MB power supply. YOU CANNOT detach the cable from the drive, we tried no go. Even more bizarre, the top of the case is GLUED to the hard disk!!! I suppose if you want to add a 60/80 megabyte drive, it will have to be RE-GLUED!!! But it would be possible to change the drive no el problemo. Interesting, the power supply on my machine was rated at 70Watts PS case, though my docs say 90W??. When you pop the top of the case, the floppy drive is attached to the top of the case via three screws that are mounted through the drive to 4 posts on the top cover. Very easy to change the drive. Well, here is some software I wrote, I got the basic information from joe gaudreau@SUN who was kind enough to give me the information to make this possible. It switches the MEGA STE into 16Mhz during bootup so boottime is noticeably shorter. Here is the program: table !"#$%&'()*+,-./0123456789:;<=>? @ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_ begin 644 d:\turbo_c\acics.src\s8to16.tos M8!H Z^ "^ '\8 *\ %+L &!@ 1Q 'Z ^z M/CX@5%520D\M0R \/#P\("!F;W(@051!4DDM4U0@(" @5F5R<VEO;B @,BXPy M(" H0RDX."TY,"!";W)L86YD($EN=&5R;F%T:6]N86P@( )D@@"V8()F\ x M!' !8 )"0"/+ 1MC/ 1NB!K S1ZP 4T>L '-#\ 0 CR $< @"]"(w MP#P _"Y D+P !Z@(\ !&\2GD !&Z9P FI"\ ^L \ /PB0"A))&L v M+"+*2AIF_"+*2AIF]D*A+P@O"S\\ _/ !*3D%/[P ,0>L @#8\ $2$$B!u M0_ 0 4(10J=@-@P1 "%J$$(12BD 6<(2&D 5)#8" ,$0 B9AH2O 4TD,t M$0 B5\G_^$I!:PY(:0 !4D-"$5.)4<G_QDHI %G!DAI %20TAY 8"1/s M3KD *P, ,@2B),3KD &R/P @.0 #L!G!"! 3I @.0 #L1G!"! 3I!.r MN0 #'(_/ !,3D$O [_Y 1O&(&3OD +"D<A.N0 #K(F #/\ , _XX@q M($-.N0 #K(F'TYU+PJ_^0 $;QB!D[Y "PD7Y .R$ZY .J.! 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P!"@$* 0H""@$$ @$ > ,(! "D @i M !L@@$ +@ " &$ , # ( . !A "L @ ! ( h M X &$ *P ! $ 0 ! 90 ;!0 $ g M H 0* $ 1#I<5%520D]?f M0UQ!0TE#4RY34D-<4SA43S$V+D, <V%V95]S=&%C:P!M86EN %1U<F)O7V5Ne %9V%G90!#d c end Enjoy--Gregory
bgr@uncle-bens.rice.edu (Robert G. Rhode) (04/01/91)
In article <1991Mar31.181651.9813@daffy.cs.wisc.edu>, carter@cat23.cs.wisc.edu (Gregory Carter) writes: > > I didn't think I had a 68881, but I do. WHY, and if it will ever be of > any use, who knows. I think Atari could have saved themselves some money > though by dumping the blitter and math coprocessor. It really is stupid > on a 16MHz M68000. > I disagree. The software floating point routines even at 16 MHz could easily take 5 or 10 times as long as the 68881, and you will find that any computer that is halfway serious about graphics has a blitter or graphics engine that does BitBLT.