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FLPOP(8)	    UNIX Programmer's Manual		 FLPOP(8)



[1mNAME
     [0mflpop - specify parameters on variable fdc devices

[1mSYNOPSIS
     [0mflpop [ [1m-o [0m] [ [1mdevice-type [0m]

[1mDESCRIPTION
     [0m_F_l_p_o_p is a screen-based program for setting the physical
     layout parameters of the variable-format devices
     /_d_e_v/[_r]_f_d_v{_1_0_2_4,_5_1_2,_2_5_6} to emulate the sector layouts of
     foreign disc formats not otherwise supported under Acorn
     UNIX. The parameters so set are not reset until asked for or
     the system is rebooted.

     The [1mdevice-type [0mparameter specifies which of the three
     available variable-format devices is to have its parameters
     set.  If no parameter is given, the type is taken from the
     value of the environment variable [1mFLOPPY[0m, if it is defined;
     otherwise the type _1_0_2_4 is used.  Whichever way the type is
     determined, it must be specified simply as one of the
     strings _1_0_2_4, _5_1_2 or _2_5_6 to select the corresponding device:
     /dev/rfdf_t_y_p_e.  The initial layout settings (at boot-time)
     for each of these devices are the same as the settings used
     by the corresponding fixed format device
     /_d_e_v/[_r]_f_d_f{_1_0_2_4,_5_1_2,_2_5_6}.  (Note that the variable format
     device names are slightly misleading in that it is possible
     to set a sector length for a device other than that implied
     by its name.)

     If the [1m-o [0moption is used flpop will display the existing set
     of parameters, otherwise the device will be reset to its
     default values.  The user can step through the values
     displayed, pressing return to accept the existing parame-
     ters, or overtyping a new value.

     _D_i_s_c _U_n_i_t provides another opportunity to select the disc
     unit other than from the argument or from the environment
     variable. The user is prompted as to whether he wants the
     unit to be initialised to the boot-time values.

     _B_y_t_e_s/_s_e_c_t_o_r may be 256, 512 or 1024.  Note that as men-
     tioned above this parameter is not constrained to match the
     disc unit name.

     _S_e_c_t_o_r_s _p_e_r _t_r_a_c_k and _T_r_a_c_k_s _p_e_r _s_u_r_f_a_c_e are hopefully
     self-explanatory.

     _S_e_c_t_o_r _n_u_m_b_e_r_i_n_g _s_t_a_r_t_s _a_t may be set to 0 or 1 according to
     whether the sectors are numbered 0 to n-1 (as in _A_D_F_S
     diskettes), or 1 to n (as in _M_S-_D_O_S diskettes).





Printed 31/3/92     Revision 1.6 of 15/12/88			1






FLPOP(8)	    UNIX Programmer's Manual		 FLPOP(8)



     _S_u_r_f_a_c_e _a_c_c_e_s_s may be _s_u_r_f_a_c_e, to denote that all of side 0,
     then all of side 1 is used, _c_y_l_i_n_d_e_r, to denote that alter-
     nate sides are used, or _f_o_l_d_e_d, to denote that access is
     forward on side 0 and backward on side 1.

     _A_p_p_l_y _i_n_t_e_r_l_e_a_v_e _o_n _f_o_r_m_a_t/_r_e_a_d-_w_r_i_t_e may be set to format,
     to denote that sector interleaving is applied when the
     diskette is formatted, or when the diskette is read or writ-
     ten.

     _I_n_t_e_r_l_e_a_v_e gives the sector interleave on a track.

     _S_k_e_w gives the inter-track skew.

     _I_n_i_t_i_a_l _t_r_a_c_k is usually zero, however some machines insist
     on starting at track 1, working to the end and then using
     the track zero. This option provides for this.

[1mFILES
     [0m/dev/rfdv{1024,512,256}

[1mSEE ALSO
     [0madfsls(1), adfscat(1), adfscp(1), wradfs(1), msdosls(1),
     msdoscat(1), msdoscp(1), wrmsdos(1), fdc(4), ffd(8).































Printed 31/3/92     Revision 1.6 of 15/12/88			2



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