[sdiy] HMI-200 8051 ICE Ext. Clk

[MTG]

We might also have one of these old beasts at work. Or perhaps another 
brand from the same era. I will dig around. Interesting about the MMT8 
as a dev system. I think they scrambled the LCD data lines or EPROM data 
lines on that one. Can't remember for sure. I always thought the old 
modems would make a good start. 8031, EPROM, RAM, serial port(s)...

GB

On 10/12/2016 8:43 AM, Barry Klein wrote:
> Too long ago for me to remember but having lunch today with an engineer
> that used it quite a bit in the early 90's(?) if he remembers I'll let
> you know. In the meantime I found this about another emulator:
>
> It is dissuaded to use a crystal in the target as a clock source during
> the emulation. It is recommended that the oscillator be used instead.
> Normally, a crystal and two capacitors are connected to the CPU's clock
> inputs in the target application as stated in the CPU datasheets. A
> length of clock paths is critical and must be taken into consideration
> when designing the target. During the emulation, the distance between
> the crystal in the target and the CPU (on the POD) is furthermore
> increased; therefore the impedance may change in a manner that the
> crystal doesn't oscillate anymore. In such case, a standalone crystal
> circuit, oscillating already without the CPU must be built or an
> oscillator must be used.
>
>
> Barry
>
> On Oct 11, 2016, at 8:52 PM, Tony K <weplar at gmail.com
> <mailto:weplar at gmail.com>> wrote:
>
>> Hi there folks, time for me to ask for help this time.
>>
>> I recently revisited my old 8051 music development projects and have
>> never tried using the targets external clock but used the ICE's
>> internal 16 MHz clock. This has been okay for things up to now but for
>> s/w timing loops and such of course this is unacceptable. Basically
>> the problem is the emulator software - and I have the Huntsville DOS ,
>> 16 and 32 bit software running on a slow serial port (38400 max) -
>> crashes or times out when I set ext. clk in the configuration page.
>> Always works with it's internal clock.
>>
>> The test target was the Jupiter-6's own 12 Mhz oscillator which is
>> 'double buffered' before going to the slave voice micros. Another
>> question I had was how do you get these emulators to work with targets
>> that use crystals or ceramic resonators and the internal 8051
>> oscillator ? It seems that would be obvious oversight. The
>> documentation is of no help.. well maybe a little.
>>
>> My dev system consists if an MMT-8, an Eprom Emulator and this ICE I
>> acquired recently and had tried it with the MMT-8.
>>
>> Sorry if any of this is confusing.
>> This is am older Huntsville Microsystems 8051 ICE, very powerful but
>> slow (38400 baud) !
>>
>> Barry if you can chime in here that would be great, thanks everyone.
>>
>> TK
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