diff --git a/sigma/sigma_bugs.txt b/sigma/sigma_bugs.txt
index b6ea4c5a..7670884b 100644
--- a/sigma/sigma_bugs.txt
+++ b/sigma/sigma_bugs.txt
@@ -123,6 +123,7 @@
 117: CPU: sim_interval is decremented before breakpoint test, which is incorrect.
 118. MT: revised error handling failed to set tape mark status on space file forward/reverse.
 119. IO: UEND flag in the wrong bit position in status word.
+120. DP: SEEK(I), RECAL(I) must be coded as fast operations.
 
 
 Diagnostic Notes
diff --git a/sigma/sigma_dp.c b/sigma/sigma_dp.c
index de4679f5..e87d22d3 100644
--- a/sigma/sigma_dp.c
+++ b/sigma/sigma_dp.c
@@ -25,6 +25,7 @@
 
    dp           moving head disk pack controller
 
+   23-Jul-22    RMS     SEEK(I), RECAL(I) should be fast operations (Ken Rector)
    02-Jul-22    RMS     Fixed bugs in multi-unit operation
    28-Jun-22    RMS     Fixed off-by-1 error in DP_SEEK definition (Ken Rector)
    07-Jun-22    RMS     Removed unused variables (V4)
@@ -337,13 +338,13 @@ static DP_SNSTAB dp_sense_16B[] = {
 #define C_C             (1u << (DP_CTYPE + 1))          /* ctrl cmd */
 
 static uint16 dp_cmd[256] = {
-   0, C_A, C_A, C_A, C_A|C_F, C_A, 0, C_16B|C_F,
+   0, C_A, C_A, C_A|C_F, C_A|C_F, C_A, 0, C_16B|C_F,
    0, C_A, C_A, 0, 0, 0, 0, C_16B|C_F|C_C,
    0, 0, C_A, C_A|C_F, 0, 0, 0, C_16B|C_F,
    0, 0, 0, 0, 0, 0, 0, C_16B|C_F|C_C,
    0, 0, 0, C_10B|C_F, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
-   0, 0, 0, C_A, 0, 0, 0, 0,
+   0, 0, 0, C_A|C_F, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
@@ -353,13 +354,13 @@ static uint16 dp_cmd[256] = {
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
-   0, 0, 0, C_A, 0, 0, 0, 0,
+   0, 0, 0, C_A|C_F, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
-   0, 0, 0, C_16B, 0, 0, 0, 0,
+   0, 0, 0, C_16B|C_F, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,