HP48GX - Simple Program Question

[Giuseppe Donnini]

(08-28-2019 09:45 PM)rprosperi Wrote:  [...] though there could be a line limit of 255 or something high like that [...]

The maximum decompilation width is indeed 255. The System RAM variable DcompWidth which holds the pertinent information, is two nibbles wide, allowing for values between 0 and FF hex or 255 decimal.

DcompWidth is set by the Primitive Code Object !DcompWidth which takes a system binary integer (5 nibbles) as an argument, but only the two least significant nibbles of the latter are taken into account:


        D0=(5)  =DcompWidth   
        DAT0=A  B               * with A[A] containing the body of the bint


Or, to put it differently, any argument for !DcompWidth is taken modulo 256 while being written to DcompWidth.

[DcompWidth is located at address #70770h in the HP-48SX, and at address #808EEh in the HP-48GX; !DcompWidth is a supported entry point at #1795Ah.]