6888x NULL frame undocumented feature.

diff --git a/fpp.cpp b/fpp.cpp
index ff254d551bf9d4a5914c5b054d180d4b23329640..715570be3fbc61478f426062ae47788156fac672 100644 (file)
--- a/fpp.cpp
+++ b/fpp.cpp
@@ -2159,8 +2159,9 @@ void fpuop_save (uae_u32 opcode)
                                ad -= frame_size;
                }
        } else { /* 68881/68882 */
-               int frame_size = regs.fpu_state == 0 ? 0 : currprefs.fpu_model == 68882 ? 0x3c : 0x1c;
-               uae_u32 frame_id = regs.fpu_state == 0 ? 0x18 << 16 : (fpu_version << 24) | ((frame_size - 4) << 16);
+               int frame_size_real = currprefs.fpu_model == 68882 ? 0x3c : 0x1c;;
+               int frame_size = regs.fpu_state == 0 ? 0 : frame_size_real;
+               uae_u32 frame_id = regs.fpu_state == 0 ? ((frame_size_real - 4) << 16) : (fpu_version << 24) | ((frame_size_real - 4) << 16);
                
                if (currprefs.mmu_model) {
                        if (incr < 0) {