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8BIT
 Post subject: website changes
PostPosted: Wed Mar 14, 2012 4:10 am 
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I have update how the hyperlinks work on my website. It will now be easier to Favorite each page and to provide direct link a specific page.
(No more having to link to the main page and then say "click on the third link down titled ...")

The only negaitve impact is the title and contents page frames get reloaded on each click, but they are small enough that it should not detract too much.

Still working on the LCD display driver, but have been busy with projects at home and work.

Daryl

http://sbc.rictor.org/
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GARTHWILSON
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PostPosted: Wed Mar 14, 2012 4:38 am 
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Thanks. I changed the 65SPI link on my links page. What's the difference between http://sbc.rictor.org/home.html and http://sbc.rictor.org/index.html ?

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8BIT
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PostPosted: Wed Mar 14, 2012 5:17 am 
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No Difference - index.html is the default file name used when you enter just "sbc.rictor.org". It simply points to the home.html to fill the page.

Daryl
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BigDumbDinosaur
 Post subject: Re: website changes
PostPosted: Tue Aug 21, 2012 6:03 am 
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BTW, SBC-4 looks real good and is well laid out. How fast have you been able to run it using Garth's SIMMs?

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8BIT
 Post subject: Re: website changes
PostPosted: Tue Aug 21, 2012 12:28 pm 
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Thanks. When I tested Garth's module, I was able to run it at 12MHz (SBC-4 main board only).

Just to note, when I have my system loaded with the two daughter boards, it has a little trouble at 12MHz but 10MHz opeqation is rock solid. The SRAM module does not affect the overall speed as the daughter cards are buffered through the CPLD. I did go back and add heatsinks to the CPLD's. I may re-test the system at 12MHZ again someday.

Daryl
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BigDumbDinosaur
 Post subject: Re: website changes
PostPosted: Tue Aug 21, 2012 5:47 pm 
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8BIT wrote:
Thanks. When I tested Garth's module, I was able to run it at 12MHz (SBC-4 main board only).

Just to note, when I have my system loaded with the two daughter boards, it has a little trouble at 12MHz but 10MHz opeqation is rock solid. The SRAM module does not affect the overall speed as the daughter cards are buffered through the CPLD. I did go back and add heatsinks to the CPLD's. I may re-test the system at 12MHZ again someday.

Daryl

Just how much drive can the CPLD provide?

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8BIT
 Post subject: Re: website changes
PostPosted: Tue Aug 21, 2012 9:27 pm 
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BigDumbDinosaur wrote:
Just how much drive can the CPLD provide?


The XC95108 datasheet says it can drive 24mA.

In my case, I think my speed limitation is a result of using a ribbon cable to interconnect my daughter boards and that I have several devices (XC9572, WDC65C22, (2) 74HC573, LAT22V10) connected that are putting a larger-than-ideal capacitive load on those outputs.

None of this is conclusive as there was not enough interest in the SBC-4 for me to continue testing and development.

Daryl
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GARTHWILSON
 Post subject: Re: website changes
PostPosted: Tue Aug 21, 2012 9:39 pm 
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Quote:
None of this is conclusive as there was not enough interest in the SBC-4 for me to continue testing and development.

I still have a pipe dream of porting my '816 Forth to it so the beginner can have it working right out of the box, and put a video on my website showing how easy it is to get results. People don't believe it can be so simple until they see it.

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BigDumbDinosaur
 Post subject: Re: website changes
PostPosted: Wed Aug 22, 2012 12:16 am 
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8BIT wrote:
BigDumbDinosaur wrote:
Just how much drive can the CPLD provide?

The XC95108 datasheet says it can drive 24mA.

In my case, I think my speed limitation is a result of using a ribbon cable to interconnect my daughter boards and that I have several devices (XC9572, WDC65C22, (2) 74HC573, LAT22V10) connected that are putting a larger-than-ideal capacitive load on those outputs.

The 74HC573s may be a problem timing-wise. The TI spec says Tpd for that part is 21-30ns at 25° C (best case operation). 74HC logic is actually rather slow, which is why I used 74AC logic in POC V1. The same part in 74AC logic has a Tpd of 5ns under the same conditions; 74ABT is even faster and has twice the drive strength of 74AC.

Aside from that, your suspicion that the CPLD's 24ma drive is probably not adequate is probably valid when the parasitic capacitance in the ribbon cable is tossed into the mix. For instance, SCSI bus drivers are required to source *and* sink 48ma minimum to support a bus speed of 10 MHz. Much of that drive is there to overcome bus cable capacitance.

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None of this is conclusive as there was not enough interest in the SBC-4 for me to continue testing and development.

Sorry to hear that. Maybe that will change after the election in November. :?

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8BIT
 Post subject: Re: website changes
PostPosted: Wed Aug 22, 2012 1:58 am 
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I've put the SBC-4 away for a while so I start work on this:

The H5 Single Seat Airplane - http://www.flyhummel.com/

I have still been monioring this forum and a few others too.

Daryl
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BigDumbDinosaur
 Post subject: Re: website changes
PostPosted: Wed Aug 22, 2012 2:33 am 
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8BIT wrote:
I've put the SBC-4 away for a while so I start work on this:

The H5 Single Seat Airplane - http://www.flyhummel.com/

I have still been monitoring this forum and a few others too.

Daryl

Nice-looking plane. The VNE and G-rating are very good for something designed for scratch builders. Building it should keep you out of the local bars for quite a while. :lol: Is that a VW engine they're using?

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8BIT
 Post subject: Re: website changes
PostPosted: Wed Aug 22, 2012 12:16 pm 
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Yes, the engine is VW-based. :D

Daryl
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