diff --git a/adam/src/fn_fuji/fuji_get_host_prefix.c b/adam/src/fn_fuji/fuji_get_host_prefix.c
index 671e701..4301dc5 100644
--- a/adam/src/fn_fuji/fuji_get_host_prefix.c
+++ b/adam/src/fn_fuji/fuji_get_host_prefix.c
@@ -1,8 +1,30 @@
 #include <stdbool.h>
 #include <stdint.h>
 #include "fujinet-fuji.h"
+#include <eos.h>
+#include <string.h>
+
+extern unsigned char response[1024];
 
 bool fuji_get_host_prefix(uint8_t hs, char *prefix)
 {
-	return true;
+  struct _ghp
+  {
+    unsigned char cmd;
+    unsigned char hs;
+  } ghp;
+
+  memset(response,0,sizeof(response));
+  ghp.cmd = 0xE0;
+  ghp.hs = hs;
+
+  if (eos_write_character_device(0x0f,ghp,sizeof(ghp)) != 0x80)
+    return false;
+
+  if (eos_read_character_device(0x0f,response,sizeof(response)) != 0x80)
+    return false;
+
+  strcpy(prefix,response);
+  
+  return true;
 }
diff --git a/adam/src/fn_fuji/fuji_set_host_prefix.c b/adam/src/fn_fuji/fuji_set_host_prefix.c
index c9edf98..9a0adad 100644
--- a/adam/src/fn_fuji/fuji_set_host_prefix.c
+++ b/adam/src/fn_fuji/fuji_set_host_prefix.c
@@ -1,8 +1,23 @@
 #include <stdbool.h>
 #include <stdint.h>
 #include "fujinet-fuji.h"
+#include <eos.h>
+#include <string.h>
 
 bool fuji_set_host_prefix(uint8_t hs, char *prefix)
 {
-	return true;
+  struct _shp
+  {
+    unsigned char cmd;
+    unsigned char hs;
+    unsigned char prefix[256];
+  } shp;
+
+  shp.cmd = FUJICMD_SET_HOST_PREFIX;
+  shp.hs = hs;
+  strcpy(shp.prefix,prefix);
+  
+  eos_write_character_device(0x0f,&shp,sizeof(shp));
+
+  return true;
 }
diff --git a/apple2/src/fn_fuji/fuji_get_host_prefix.c b/apple2/src/fn_fuji/fuji_get_host_prefix.c
index 53d9b39..75d3b00 100644
--- a/apple2/src/fn_fuji/fuji_get_host_prefix.c
+++ b/apple2/src/fn_fuji/fuji_get_host_prefix.c
@@ -1,8 +1,20 @@
 #include <stdint.h>
+#include <string.h>
 #include "fujinet-fuji.h"
+#include "fujinet-bus-apple2.h"
 
+// A8 to AF are now being allocated as get host prefix for slots 0 to 7.
 bool fuji_get_host_prefix(uint8_t hs, char *prefix)
 {
-	// Not implemented in A2
-	return false;
+  uint8_t stat = hs + 0xA8;
+  
+  if (sp_get_fuji_id() == 0) {
+    return false;
+  }
+  
+  sp_error = sp_status(sp_fuji_id, stat);
+  if (sp_error == 0) {
+    memcpy(prefix, &sp_payload[0], 256);
+  }
+  return sp_error == 0;
 }
diff --git a/apple2/src/fn_fuji/fuji_set_host_prefix.c b/apple2/src/fn_fuji/fuji_set_host_prefix.c
index d7fe97b..5abb1b7 100644
--- a/apple2/src/fn_fuji/fuji_set_host_prefix.c
+++ b/apple2/src/fn_fuji/fuji_set_host_prefix.c
@@ -1,8 +1,29 @@
 #include <stdint.h>
+#include <string.h>
 #include "fujinet-fuji.h"
+#include "fujinet-bus-apple2.h"
 
 bool fuji_set_host_prefix(uint8_t hs, char *prefix)
 {
-	// Not implemented in A2
-	return false;
+  // Not implemented in A2
+  size_t filename_len = strlen(prefix);
+  if (filename_len >= 254)
+    {
+      return false;
+    }
+
+  sp_error = sp_get_fuji_id();
+  if (sp_error <= 0)
+    {
+      return false;
+    }
+
+  sp_payload[0] = (filename_len + 1) & 0xFF;
+  sp_payload[1] = 0;
+  sp_payload[2] = hs;
+  strcpy((char *) &sp_payload[3], prefix);
+
+  sp_error = sp_control(sp_fuji_id, FUJICMD_SET_HOST_PREFIX);
+  
+  return sp_error == 0;
 }
diff --git a/coco/src/fn_fuji/fuji_get_host_prefix.c b/coco/src/fn_fuji/fuji_get_host_prefix.c
index 8169430..b5d3b98 100644
--- a/coco/src/fn_fuji/fuji_get_host_prefix.c
+++ b/coco/src/fn_fuji/fuji_get_host_prefix.c
@@ -1,9 +1,27 @@
 #include <cmoc.h>
 #include <coco.h>
+#include <dw.h>
+#include <fujinet-fuji-coco.h>
 #include "fujinet-fuji.h"
 
 bool fuji_get_host_prefix(uint8_t hs, char *prefix)
 {
-    // TODO: not implemented in firmware.
-    return true;
+  struct _ghp
+  {
+    uint8_t opcode;
+    uint8_t cmd;
+    uint8_t hs;
+  } ghp;
+
+  ghp.opcode = OP_FUJI;
+  ghp.cmd = FUJICMD_GET_HOST_PREFIX;
+  ghp.hs = hs;
+
+  bus_ready();
+
+  dwwrite((uint8_t *)&ghp, sizeof(ghp));
+  if (fuji_get_error())
+    return false;
+  
+  return fuji_get_response((uint8_t *)prefix, 256);
 }
diff --git a/coco/src/fn_fuji/fuji_set_host_prefix.c b/coco/src/fn_fuji/fuji_set_host_prefix.c
index 22848dc..98f5092 100644
--- a/coco/src/fn_fuji/fuji_set_host_prefix.c
+++ b/coco/src/fn_fuji/fuji_set_host_prefix.c
@@ -1,9 +1,26 @@
 #include <cmoc.h>
 #include <coco.h>
 #include "fujinet-fuji.h"
+#include <dw.h>
+#include <fujinet-fuji-coco.h>
 
 bool fuji_set_host_prefix(uint8_t hs, char *prefix)
 {
-    // Not implemented anywhere yet.
-    return true;
+  struct _shp
+  {
+    uint8_t opcode;
+    uint8_t cmd;
+    uint8_t hs;
+    char filename[256];    
+  } shp;
+
+  shp.opcode = OP_FUJI;
+  shp.cmd = FUJICMD_SET_HOST_PREFIX;
+  shp.hs = hs;
+  strcpy(shp.filename,prefix);
+
+  bus_ready();
+  dwwrite((uint8_t *)&shp, sizeof(shp));
+
+  return !fuji_get_error();
 }
diff --git a/commodore/src/fn_fuji/fuji_get_host_prefix.c b/commodore/src/fn_fuji/fuji_get_host_prefix.c
index 2ce31c5..b22af90 100644
--- a/commodore/src/fn_fuji/fuji_get_host_prefix.c
+++ b/commodore/src/fn_fuji/fuji_get_host_prefix.c
@@ -1,10 +1,26 @@
 #include <stdbool.h>
 #include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
 #include "fujinet-fuji.h"
 #include "fujinet-fuji-cbm.h"
 
 bool fuji_get_host_prefix(uint8_t hs, char *prefix)
 {
-	// not implemented on CBM
-	return false;
+  uint8_t *filename;
+  bool is_success;
+  int bytes_read;
+  
+  filename = malloc(256);
+  if (filename == NULL) {
+    return false;
+  }
+  memset(filename, 0, 256);
+  
+  is_success = open_read_close_data_1(FUJICMD_GET_HOST_PREFIX, &bytes_read, hs, 256, (uint8_t *) filename);
+  if (is_success) {
+    strcpy(prefix, (char *)filename);
+  }
+  free(filename);
+  return is_success;
 }
diff --git a/commodore/src/fn_fuji/fuji_set_host_prefix.c b/commodore/src/fn_fuji/fuji_set_host_prefix.c
index a31980f..72acec4 100644
--- a/commodore/src/fn_fuji/fuji_set_host_prefix.c
+++ b/commodore/src/fn_fuji/fuji_set_host_prefix.c
@@ -1,10 +1,29 @@
 #include <stdbool.h>
 #include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
 #include "fujinet-fuji.h"
 #include "fujinet-fuji-cbm.h"
 
 bool fuji_set_host_prefix(uint8_t hs, char *prefix)
 {
-	// Not implemented in IEM fuji firmware
-	return false;
+  uint8_t *pl;
+  uint16_t pl_len;
+  bool ret;
+  
+  pl_len = strlen(prefix) + 3 + 1; // add 1 for the null string terminator, although technically not required as we go by lengths
+  
+  pl = malloc(pl_len);
+  if (pl == NULL) {
+    status_error(ERROR_MALLOC_FAILED, FUJICMD_SET_HOST_PREFIX);
+    return false;
+  }
+  
+  pl[0] = hs;
+  strcpy((char *) &pl[1], prefix);
+  pl[pl_len - 1] = '\0';
+  
+  ret = open_close_data(FUJICMD_SET_HOST_PREFIX, true, pl_len, pl);
+  free(pl);
+  return ret;
 }
diff --git a/fujinet-fuji.h b/fujinet-fuji.h
index 14437d3..1733c92 100644
--- a/fujinet-fuji.h
+++ b/fujinet-fuji.h
@@ -67,6 +67,8 @@
 #define FUJICMD_GET_DIRECTORY_POSITION     0xE5
 #define FUJICMD_SET_DIRECTORY_POSITION     0xE4
 #define FUJICMD_SET_DEVICE_FULLPATH        0xE2
+#define FUJICMD_SET_HOST_PREFIX            0xE1
+#define FUJICMD_GET_HOST_PREFIX            0xE0
 #define FUJICMD_WRITE_APPKEY               0xDE
 #define FUJICMD_READ_APPKEY                0xDD
 #define FUJICMD_OPEN_APPKEY                0xDC
diff --git a/pmd85/src/fn_fuji/fuji_get_host_prefix.c b/pmd85/src/fn_fuji/fuji_get_host_prefix.c
index 034e42d..71ec9c9 100644
--- a/pmd85/src/fn_fuji/fuji_get_host_prefix.c
+++ b/pmd85/src/fn_fuji/fuji_get_host_prefix.c
@@ -2,6 +2,22 @@
 
 bool fuji_get_host_prefix(uint8_t hs, char *prefix)
 {
-    // TODO: not implemented in firmware.
-    return true;
+  struct _ghp
+  {
+    uint8_t opcode;
+    uint8_t cmd;
+    uint8_t hs;
+  } ghp;
+
+  ghp.opcode = OP_FUJI;
+  ghp.cmd = FUJICMD_GET_HOST_PREFIX;
+  ghp.hs = hs;
+
+  bus_ready();
+
+  dwwrite((uint8_t *)&ghp, sizeof(ghp));
+  if (fuji_get_error())
+    return false;
+  
+  return fuji_get_response((uint8_t *)prefix, 256);
 }
diff --git a/pmd85/src/fn_fuji/fuji_set_host_prefix.c b/pmd85/src/fn_fuji/fuji_set_host_prefix.c
index 8de7f96..edaa38f 100644
--- a/pmd85/src/fn_fuji/fuji_set_host_prefix.c
+++ b/pmd85/src/fn_fuji/fuji_set_host_prefix.c
@@ -1,7 +1,25 @@
+#include <dw.h>
+#include <fujinet-fuji-pmd85.h>
+#include <string.h>
 #include "fujinet-fuji.h"
 
 bool fuji_set_host_prefix(uint8_t hs, char *prefix)
 {
-    // Not implemented anywhere yet.
-    return true;
+  struct _shp
+  {
+    uint8_t opcode;
+    uint8_t cmd;
+    uint8_t hs;
+    char filename[256];    
+  } shp;
+
+  shp.opcode = OP_FUJI;
+  shp.cmd = FUJICMD_SET_HOST_PREFIX;
+  shp.hs = hs;
+  strcpy(shp.filename,prefix);
+
+  bus_ready();
+  dwwrite((uint8_t *)&shp, sizeof(shp));
+
+  return !fuji_get_error();
 }