Yes, as it was part and parcel of every 1410.  but I have not tested it yet.

Sent from my iPad

> On Jul 11, 2023, at 12:06, Van Snyder via cctalk <cctalk@classiccmp.org> 
> wrote:
> 
> On Mon, 2023-07-10 at 21:32 -0500, Jay Jaeger via cctalk wrote:
>> Over the past couple of months I have been working on my FPGA 
>> implementation of the IBM 1410 1960's era pre System/360 system again. 
>> I am pleased to share that the CPU now passes a significant diagnostic, 
>> CU01, which tests almost all of the instructions, and also tests I/O 
>> with overlap and the priority feature (interrupts).
> 
> Did you implement the compatibility feature, so it can run 1401
> programs too?
> 
> 

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