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Type: Posts; User: Tony Rowell

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    yes, that is Neil

    yes, that is Neil
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    RIP Neil Quarmby

    sadly I have to report that one of the people that made the Cortex possible, Neil Quarmby lost his battle against a brain tumour on Friday and passed away.
    Rest in peace Neil
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    Thanks, I'd missed that that is true...

    Thanks, I'd missed that






    that is true but ...

    if you are doing auto baud using a software loop to measure the width of the start bit you do need to take it into count. For example, if...
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    can you point me to a reference to the 9900 core...

    can you point me to a reference to the 9900 core in the FPGA, I've had a look at the F18A pages and I cant see any mention of it but I'm probably just being blind.
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    you should be able to just ratio the count. Take...

    you should be able to just ratio the count. Take the loop timing the start bit and using the 9995 data sheet write down the number of clock cycles and memory accesses for each line of code (it is...
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    {Stuart} The 9995 data manual shows a gate of a...

    {Stuart} The 9995 data manual shows a gate of a 7407 connected between /RESET and READY to achieve this.
    probably a diode will do instead so /reset pulls down ready


    {Stuart} Not that I'm aware...
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    I've recently been using this...

    I've recently been using this http://www.xess.com/shop/product/xula2-lx25/ (they also do a cheaper version the LX9 with a slightly smaller FPGA) with enough internal block ram to implement the...
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    has anyone considered implementing the whole of...

    has anyone considered implementing the whole of the cortex in an FPGA?
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    anything else the group is missing (not that I...

    anything else the group is missing (not that I hoard stuff LOL)?
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    I've put the scan images at ...

    I've put the scan images at https://www.dropbox.com/s/htv987sqzzp6mae/EbusSystemDesignImages.zip (I wont leave anything there long term, I dont have much space). Can you recreate the complete pdf...
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    Ebus system design book scanned, temporarily...

    Ebus system design book scanned, temporarily uploaded to https://www.dropbox.com/s/3dussnv2mrz2q0j/EbusSystemDesign.pdf (11.5MByte), I can;t leave it there so if someone can copy it to somewhere...
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    16614 scanning this at the moment, I'll upload...

    16614

    scanning this at the moment, I'll upload it somewhere when it's finished
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    spot on, nasty thing to do to a processor isn't...

    spot on, nasty thing to do to a processor isn't it. A later member of the family made it such that if the target of an X instruction was another X it generated an illegal instruction interrupt to...
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    When I worked for TI a few years ago I wrote a...

    When I worked for TI a few years ago I wrote a "9900 family member" core in vhdl from scratch, I don't have access to it anymore but there is no real reason that a 9995 core couldn't be written if...
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    I've found some old polaroids of the very 1st...

    I've found some old polaroids of the very 1st Cortex (when it was called Synapse), they are not in brilliant shape but the I've scanned them and put them on flickr at
    ...
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    tms9995 - was the info in my PM of use?

    tms9995 - was the info in my PM of use?
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    Maybe processing the listing will give you a...

    Maybe processing the listing will give you a machine readable copy of the source code. As a matter of interest how did you come by the listing?
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    I don't think anyone would care, if push came to...

    I don't think anyone would care, if push came to shove then TI would probably claim that they owned everything (naturally) but this is all so far in the past and of no commercial interest to anyone.
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    I wasn't with TI shortly after the magazine...

    I wasn't with TI shortly after the magazine article came out although I did go back to work for them years later. Part of the deal with the cortex was that we got one of the kits each as "payment"...
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    resources were available but not officially, lots...

    resources were available but not officially, lots of favours and being resourceful with all the work being done out of hours but it was a lot of fun too.
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    This is the schematic of the ebus arbiter from...

    This is the schematic of the ebus arbiter from the design manual, probably the LS2001 was intended to have this inside. Should be doable with a simple PAL these days.

    For those people looking at...
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    how the cortex came to be...

    The cortex came about as an extension of a group of us at TI trying to build ourselves a home computer out of "scrap", remember that at the time a home computer was somewhere between non-existant and...
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    Ebus cards definitely existed, the bus was one...

    Ebus cards definitely existed, the bus was one that TI used for a range of eurocard sized boards and the cortex just used that bus as a means of expansion. All of the cards I remember had discrete...
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    E-Bus system design

    I don't remember anything about the LS2001 off the top of my head but I'll have a look around to see what I can find, it is quite possible that it never actually existed.
    I do however have a copy...
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    Hi there

    Hi everyone, I was a pleasantly surprise to find this forum with such recent activity about the Cortex.

    I was one of the developers of the Cortex along with Jim Gill, Neil Quarmby, Colin Hinson...
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