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Conference hydra::amiga_v1

Title:AMIGA NOTES
Notice:Join us in the *NEW* conference - HYDRA::AMIGA_V2
Moderator:HYDRA::MOORE
Created:Sat Apr 26 1986
Last Modified:Wed Feb 05 1992
Last Successful Update:Fri Jun 06 1997
Number of topics:5378
Total number of notes:38326

3547.0. "Imtronics ProRam 1.8 (for the A500)" by NITMOI::WITHERS (Another Hallmark Moment. -Al Bundy) Mon Mar 05 1990 15:17

    Hello all.  I was just considering purchasing the Imtronics ProRam 1.8
    board for the Amiga 500.  It is a board populated to (you guessed it
    :-)) up to 1.8 meg that fits inside the A501 space.  It includes the
    amentities, clock/calendar, and claims A501 compatability.
    
    Here's the hitch..I called Memory Location (I work in Tewksbury MA and
    dropped by and saw the board at Omnitek and wanted competive prices)
    and they said they wouldn't carry it yet because they were afraid it
    want' quite right (bugs, failures, ?).
    
    So, does anybody have one of these and how well does it work?  I just
    had to give up my A501 and don't want to buy another one if I can get a
    board to slide in there and hold 1.8Mb instead of .5Mb.
    
    George
T.RTitleUserPersonal
Name		DateLines
3547.1Hummmm!NSSG::SULLIVANSteven E. SullivanTue Mar 06 1990 15:2616
RE:3547.0

George,

>                   -< Imtronics ProRam 1.8 (for the A500) >-

    I  was  speaking with Dave Haynie (OK, so I'm name dropping...;')
and this topic came up. He mentioned that a modification of the  Gary
logic  would  be  necessary  to  make  the memory decode to the right
addresses. He mentioned that the implementation he had seen (no names
mentioned, sorry) used a "Gary Tower" to implement the extra logic.

    I got the impression that he felt such hacks were not real hot.

	Thanks,
		-SES
3547.2Autoconfig or bust..,FROCKY::BALZERChristian Balzer DTN:785-1029Wed Mar 07 1990 04:4315
    
    Re: .0, .1
    
    Yup, Steven is right here.
    To have more than 512K in the A501 space AND to have them
    autoconfiguring, you'll need your soldering iron or to insert
    intermediate sockets with the neccesary wiring.
    And you don't want any non-autoconfig memory in your system when
    that nice autoconfiguring HD-controller (or whatever) on your expansion
    slot decodes it's memory space where your RAM is, since it has no
    idea of it's presence...
    
    Regards,
    
    <CB>
3547.3Insider board or bust nowNITMOI::WITHERSAnother Hallmark Moment. -Al BundyWed Mar 07 1990 11:435
    Thats what I was afraid of...looks like the insider board for memory.
    
    Thanks for info,
    George
3547.4NSSG::SULLIVANSteven E. SullivanThu Mar 08 1990 14:5116
RE: .-1

>    To have more than 512K in the A501 space AND to have them
>    autoconfiguring, you'll need your soldering iron or to insert
>    intermediate sockets with the neccesary wiring.
 
Remember, the Amiga OS does not Autoconfig (tm) C000000 memory, it just 
notices it is there. Thus, no Autoconfig (tm) logic is needed to have 
this memory automatically recognized by the system and neither is addemem
or other hack.

My understanding of what Dave was talking about had to do with the decoding
of the address lines that connect the A501/clone to the motherboard by Gary.

	-SES
3547.5For 1.8 MB???FROCKY::BALZERChristian Balzer DTN:785-1029Fri Mar 09 1990 04:249
    Re: .4
    
    Quite correct, however I believe (have to check the manuals on the
    weekend) that this is only guaranteed (sp?) to work with 512KB and
    not with 1.8MB (mirrored areas and such stuff).
    
    Regards,
    
    <CB>
3547.6NSSG::SULLIVANSteven E. SullivanFri Mar 09 1990 10:2510
RE:.7


>   weekend) that this is only guaranteed (sp?) to work with 512KB and
>   not with 1.8MB (mirrored areas and such stuff).

Ah sooo! The memory map does show 2 meg there, but I am not sure
about the implementation particulars... very good point.

	-SES