[sdiy] how you got started with your current µC?

[Timothy Daugard]

User Manual for the CDP1802 (c) 1077 RCA

SEX  SET X N -> X -- op code En -- page 39

sets register(n) as the X register

I had it slightly wrong. You have to load a register with the address 
then set it as the X register.

. . . book back to file drawer
. . . me back to work

Tim Daugard



On 9/21/2015 1:26 PM, MTG wrote:
> Sign Extend
>
> On 9/21/2015 10:39 AM, Timothy Daugard wrote:
>> On 9/20/2015 9:22 PM, nvawter wrote:
>>> On 2015-09-20 16:54, Tim Ressel wrote:
>>>> My first proc was a COSMAC 1802, on a breadboard, with manual entry
>>>> switches, powered off a car battery, in a horse barn. (beat that!)
>>>
>>> https://en.wikipedia.org/wiki/RCA_1802#Code_samples
>>>
>>> It appears that a valid opcode on that chip is "SEX" (tee hee hee!)
>>>
>>
>> IIRC Set the X register to the following byte (for indirect addressing).
>> Easy enough to look up in the file two feet away if I cared.
>>
>> Tim Daugard
>>
>>
>>
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
>>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>