Re: [M100] REX Castellated board

[Brian White]

What exact flash part number do you have?


On Thu, Oct 19, 2017 at 1:22 PM, Brian Brindle  wrote:

> I have one put together that programmed up OK but am having issues getting
> the REX software on it. It erases all the blocks just fine but hangs when
> re-loading to block 0. Probably something up with the flash..
>
> I'll report back when I have more info.
>
> Brian
>
>
> On Thu, Oct 19, 2017 at 7:25 AM, Stephen Adolph 
> wrote:
>
>> Has anyone made a REX successfully with that modified PCB yet?
>> I would like to know if that artwork is good or bad.
>>
>> ..Steve
>>
>
>

[M100] cplds

[Stephen Adolph]

http://www.ebay.ca/itm/282700577494?ul_noapp=true

Re: [M100] M200 and bad RAM??

[Fugu ME100]

OK great!

I find the T200 memory management leaves a lot to be desired.  Even simple
things like deleting a Basic program or Text file can leave the memory
still occupied with nothing showing on the screen.  Although I do like the
screen real estate and keyboard on the T200 :)

On 19/10/17, 11:58 AM, "M100 on behalf of John Watson"

wrote:

>Wow! The ctrl-break thing now shows 19590 bytes free! Something must
>have been hogging the RAM but no idea what. Oh well.
>
>Thanks for your help.
>
>On 19/10/17 01:07, Fugu ME100 wrote:
>> A T200 with a clean memory should show around 19K per bank, if they are
>> fully populated.  Part of the 24K is taken up by the system so it is not
>> all available for the user.  Just a thought have you tried to power on
>> while holding ctrl-break to make sure nothing has been left in memory
>>from
>> some other operation?  This should do a memory clean boot.

Re: [M100] M200 and bad RAM??

[John Watson]

Wow! The ctrl-break thing now shows 19590 bytes free! Something must
have been hogging the RAM but no idea what. Oh well.

Thanks for your help.

On 19/10/17 01:07, Fugu ME100 wrote:
> A T200 with a clean memory should show around 19K per bank, if they are
> fully populated.  Part of the 24K is taken up by the system so it is not
> all available for the user.  Just a thought have you tried to power on
> while holding ctrl-break to make sure nothing has been left in memory from
> some other operation?  This should do a memory clean boot.

Re: [M100] REX Castellated board

[Fugu ME100]

When I built an original REX I had a similar problem turned out there was a bad 
solder joint on the CPLD.  The soldering looked fine from a visual inspection 
but when I used my dental pick to check each joint one of the pins moved.  
Fixed the bad joint and the board worked fine.   Might be worth a quick check 
to eliminate that possibility.

Another issue I had was poor contact in the OPT ROM socket.  I had done a bad 
job on the grinding stage and left a slight angle on the edge which meant it 
worked if I pushed it into the socket but would not work when released.   Turns 
out the contact with the socket was not very good.  Did a slight regrind and it 
worked without my thumb for support.


From: M100 
> 
on behalf of Brian Brindle >
Reply-To: >
Date: Thursday, October 19, 2017 at 10:22 AM
To: >
Cc: Model 100 Discussion 
>
Subject: Re: [M100] REX Castellated board

I have one put together that programmed up OK but am having issues getting the 
REX software on it. It erases all the blocks just fine but hangs when 
re-loading to block 0. Probably something up with the flash..

I'll report back when I have more info.

Brian


On Thu, Oct 19, 2017 at 7:25 AM, Stephen Adolph 
> wrote:
Has anyone made a REX successfully with that modified PCB yet?
I would like to know if that artwork is good or bad.

..Steve

Re: [M100] REX Castellated board

[Stephen Adolph]

check your solder joints. if you try to program to a block that is already
programmed... the flash never recovers.

On Thu, Oct 19, 2017 at 1:22 PM, Brian Brindle  wrote:

> I have one put together that programmed up OK but am having issues getting
> the REX software on it. It erases all the blocks just fine but hangs when
> re-loading to block 0. Probably something up with the flash..
>
> I'll report back when I have more info.
>
> Brian
>
>
> On Thu, Oct 19, 2017 at 7:25 AM, Stephen Adolph 
> wrote:
>
>> Has anyone made a REX successfully with that modified PCB yet?
>> I would like to know if that artwork is good or bad.
>>
>> ..Steve
>>
>
>

Re: [M100] REX Castellated board

[Brian Brindle]

I have one put together that programmed up OK but am having issues getting
the REX software on it. It erases all the blocks just fine but hangs when
re-loading to block 0. Probably something up with the flash..

I'll report back when I have more info.

Brian


On Thu, Oct 19, 2017 at 7:25 AM, Stephen Adolph 
wrote:

> Has anyone made a REX successfully with that modified PCB yet?
> I would like to know if that artwork is good or bad.
>
> ..Steve
>

Re: [M100] REX Castellated board

[Josh Malone]

I have parts on order to try again. Will be >= week.

On Thu, Oct 19, 2017 at 12:11 PM, Brian White  wrote:
> I ordered a set only a couple days ago, so it'll be a week or so for me.
>
> On Oct 19, 2017 7:25 AM, "Stephen Adolph"  wrote:
>
> Has anyone made a REX successfully with that modified PCB yet?
> I would like to know if that artwork is good or bad.
>
> ..Steve
>
>

Re: [M100] REX Castellated board

[Brian White]

I ordered a set only a couple days ago, so it'll be a week or so for me.

On Oct 19, 2017 7:25 AM, "Stephen Adolph"  wrote:

Has anyone made a REX successfully with that modified PCB yet?
I would like to know if that artwork is good or bad.

..Steve

[M100] REX Castellated board

[Stephen Adolph]

Has anyone made a REX successfully with that modified PCB yet?
I would like to know if that artwork is good or bad.

..Steve

Re: [M100] REX build failure - post mortem

[Josh Malone]

I think a larger pad would do it.

On Oct 19, 2017 12:35 AM, "Brian White"  wrote:

> That's exactly why I want to come up with a little saner way to pull up
> PORT_EN. It's way too easy to just touch the wrong side of that resistor,
> or something else in the area. It's begging to happen some percentage of
> the time even if you know what the problem is and are careful.
>
> On Wed, Oct 18, 2017 at 8:05 PM, Brian Brindle  wrote:
>
>> Josh,
>>
>> I looked at one of the REX boards I had that didn't work. The regulator
>> was getting hot on it and I had the same low resistance measurements on the
>> VCC and ground. I know on this particular one I killed the CPLD by shorting
>> the FTDI VCC and ground when jumping VCC to R3.
>>
>> Brian
>>
>> On Oct 18, 2017 7:22 PM, "Brian White"  wrote:
>>
>>> I guess if you're going to build over 60 of them it starts to matter. I
>>> just figured if I'm going to go to this much effort it took just to build
>>> one at all, that $1 wasn't even visible, but a built and in-use rex that
>>> fails some day when it might have lived, is visible. So I went for the
>>> better-ish versions of all parts. The factors for this are not the same as
>>> for mass producing a clock that will sell in dollar stores.
>>>
>>> On Wed, Oct 18, 2017 at 6:39 PM, Stephen Adolph 
>>> wrote:
>>>
 Commercial is fine


 On Wednesday, October 18, 2017, Josh Malone 
 wrote:

> Also, meant to ask:
>
> Brian's BOM includes the  Industrial variant of the CPLD. The
> commercial variant is almost $1 cheaper and seems well within
> tolerance
>
> (voltage min is 3 instead of 2.7, temp is 0 - 70 C instead of 40 - 85
> °C)
>
>
> Any reason not to sub this part in?
>
> -Josh
>
> On Wed, Oct 18, 2017 at 4:56 PM, Josh Malone 
> wrote:
> > Thanks. I'm going to just order new parts and try again.
> >
> > On Wed, Oct 18, 2017 at 4:49 PM, Brian Brindle 
> wrote:
> >> 11.7k on 2 of mine.
> >>
> >>
> >> On Oct 18, 2017 4:25 PM, "Stephen Adolph" 
> wrote:
> >>>
> >>> I can try to measure it later today for you.
> >>>
> >>> On Wed, Oct 18, 2017 at 4:24 PM, Stephen Adolph <
> twospru...@gmail.com>
> >>> wrote:
> 
>  either the chip is a dud, or you have soldered it down in the
> wrong
>  orientation (which is kinda easy to do)...  Do you have more
> CPLDs?
> 
>  On Wed, Oct 18, 2017 at 4:22 PM, Josh Malone <
> josh.mal...@gmail.com>
>  wrote:
> >
> > Thanks for the leads.
> >
> > I removed the CPLD and the resistance from 3v3 to gnd went to
> open;
> > repopulated it and it went to 3-ohms. Dunno what to try next.
> Maybe
> > put the same CPLD back on an original REX board
> (non-castellated) and
> > see what happens. But, I'd *really* love for someone to measure
> the
> > resistance on a known-good REX board and let me know what it
> should
> > be. Assuming the CPLD draws <= 1ma (datasheet says 17uA
> standby), R
> > should be over ~3k.
> >
> > -Josh
> 
> 
> >>>
> >>
>

>>>
>