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On Sun, Feb 5, 2023 at 03:48 PM, Dave Wade wrote:

As SVC 8 is a OS/MFT call it won’t be documented.

Dave,

Thanks for the pointer to GC20-1807-7_VM370_System_Programmers_Guide_Rel_6_4-81.pdf, Seems to start at p. 256.

This is where I got the list from SY20-0886-1_VM370_Rel_6_Vol_1_Mar79.pdf,? Figure 4, page 1-17, the SVC Interrupt "box" shows (bolding by me) ...

If PROBLEM MODE
? And ADSTOP SVC, simulate 'ADSTOP' to
virtual machine
? And an SVC 76, verify the parameters and
call DMKVER to build the error record. (A)
? And virtual machine IS In extended
mode and/or Page 0 is not in storage,
reflect interrupt to virtual machine
? Otherwise, fetch Page 0, move CP PSW
to virtual SVCOPSW, and move SVCNPSW
to the CP PSW
? If supervisor mode, run user-LPSW

If SVC 0 (Impossible condition or fatal error),
dump the machine

If SVC 8 (Link Request), (B)
pass control from one module to another

If SVC 12 (Return Request),
return control to calling module

If SVC 16, release Save Area (C)

If SVC 20, get next save area for (D)
calling module

If SVC 24, switch processing to
main processor

So ... that is why I gave the original list above.

?... Mark S.