HP250 curiosity

[Brian L. Stuart]

> In the case of the HP41 calculator, it was physcially impossible to run 
> machine code from the machine's internal RAM. The processor was a pseudo 
> harvard architecture, RAM was organised in 56 bit 'registers' connected 
> to the SPU DATA line, ROM was in 10 bit words connected to the ISA line. 
> Some hackers found a way round this, making ROM emulator boxes (normally 
> called MLDL (Machine Language Development Lab) units). 

Where does the synthetic programming fit in?  I thought it was
a case of creating machine language code in RAM.  And I remember
it being based on some ugly tricks, rather than an external device.

BLS