diff --git a/src/video/vid_ps55da2.c b/src/video/vid_ps55da2.c
index 0bd5035b0..2de731afd 100644
--- a/src/video/vid_ps55da2.c
+++ b/src/video/vid_ps55da2.c
@@ -64,7 +64,8 @@
 #define DA2_MASK_GAIJIRAM        0x3ffff       /* 0x3FFFF */
 #define DA2_MASK_VRAM            0xfffff       /* 0xFFFFF */
 #define DA2_MASK_VRAMPLANE       0x1ffff       /* 0x1FFFF */
-#define DA2_PIXELCLOCK           58000000.0    /* 58 MHz interlaced */
+#define DA2_CLOCK_58MHZ          58000000.0    /* 58 MHz interlaced */
+#define DA2_CLOCK_45MHZ          45570000.0    /* 45.57 MHz interlaced */
 #define DA2_BLT_MEMSIZE          0x10
 #define DA2_BLT_REGSIZE          0x40
 #define DA2_DEBUG_BLTLOG_SIZE    (DA2_BLT_REGSIZE + 1)
@@ -77,9 +78,9 @@
 /* These ROMs are currently not found.
    At least, IBM-J released a Korean and PRC version of PS/55 for each market. */
 #define DA2_DCONFIG_CHARSET_HANT  3 /* for Code page 938 Traditional Chinese */
-#define DA2_DCONFIG_MONTYPE_COLOR 0x0A
-#define DA2_DCONFIG_MONTYPE_8515  0x0B
-#define DA2_DCONFIG_MONTYPE_MONO  0x09
+#define DA2_DCONFIG_MONTYPE_COLOR 0x0A /* 1010: IBM 8514 */
+#define DA2_DCONFIG_MONTYPE_8515  0x0B /* 1011: IBM 8515 */
+#define DA2_DCONFIG_MONTYPE_MONO  0x09 /* 1001: IBM 8604 */
 
 #define DA2_BLT_CIDLE             0
 #define DA2_BLT_CFILLRECT         1
@@ -347,7 +348,7 @@ typedef struct da2_t {
     int      hdisp, htotal, hdisp_time, rowoffset;
     int      lowres;
     int      rowcount;
-    double   clock;
+    double   clock, pixelclock;
     uint32_t memaddr_latch, ca_adj;
 
     uint64_t   dispontime, dispofftime;
@@ -681,7 +682,7 @@ static uint8_t
 pixel1tohex(uint32_t addr, int index, da2_t *da2)
 {
     uint8_t pixeldata = 0;
-    for (uint8_t i = 0; i < 8; j++) {
+    for (uint8_t i = 0; i < 8; i++) {
         if (da2_vram_r(((addr << 3) | i) & (1 << (7 - index)), da2))
             pixeldata++;
     }
@@ -2330,14 +2331,18 @@ da2_recalctimings(da2_t *da2)
     /* In the video mode 3, you'll see a blank below the screen. It's NOT a bug. */
     da2->hdisp -= da2->crtc[LC_START_H_DISPLAY_ENAB];
     da2->dispend -= da2->crtc[LC_START_V_DISPLAY_ENAB];
-    da2->dispend += 1;
 
     da2->htotal = da2->crtc[LC_HORIZONTAL_TOTAL];
-    da2->htotal += 1;
+    da2->htotal += 2;
 
     da2->rowoffset = da2->crtc[LC_OFFSET]; /* number of bytes in a scanline */
 
-    da2->clock = da2->da2const;
+    if (da2->crtc[LC_END_HSYNC_PULSE] & 0x8000)
+        da2->pixelclock = DA2_CLOCK_45MHZ;
+    else
+        da2->pixelclock = DA2_CLOCK_58MHZ;
+    da2->da2const = (uint64_t) ((cpuclock / da2->pixelclock) * (double) (1ull << 32));
+    da2->clock = (double)da2->da2const;
 
     if (da2->vtotal == 0)
         da2->vtotal = da2->vsyncstart = da2->vblankstart = 256;
@@ -2407,9 +2412,11 @@ da2_recalctimings(da2_t *da2)
         da2->dispontime = TIMER_USEC;
     if (da2->dispofftime < TIMER_USEC)
         da2->dispofftime = TIMER_USEC;
-    da2_log("da2 horiz total %i display end %i vidclock %f\n", da2->crtc[0], da2->crtc[1], da2->clock);
+    da2_log("da2 horiz total %i display end %i vidclock %f\n", da2->htotal, da2->hdisp, da2->clock);
     da2_log("da2 vert total %i display end %i max row %i vsync %i\n",da2->vtotal,da2->dispend,(da2->crtc[9]&31)+1,da2->vsyncstart);
-    da2_log("da2 dispon %lu dispoff %lu on(us) %f off(us) %f\n",da2->dispontime, da2->dispofftime, (double)da2->dispontime / (double)cpuclock /  (double) (1ULL << 32) * 1000000.0, (double)da2->dispofftime / (double)cpuclock /  (double) (1ULL << 32) * 1000000.0);
+    da2_log("da2 dispon %lu dispoff %lu on(us) %f off(us) %f\n",da2->dispontime, da2->dispofftime, 
+        (double)da2->dispontime / (double)cpuclock /  (double) (1ULL << 32) * 1000000.0, 
+        (double)da2->dispofftime / (double)cpuclock /  (double) (1ULL << 32) * 1000000.0);
     da2_log("da2 linecompare %d\n", da2->split);
 }
 
@@ -3231,7 +3238,7 @@ da2_reset(void *priv)
     da2->pos_regs[0]       = DA2_POSID_L;                    /* Adapter Identification Byte (Low byte) */
     da2->pos_regs[1]       = DA2_POSID_H;                    /* Adapter Identification Byte (High byte) */
     da2->pos_regs[2]       = 0x40;                           /* Bit 7-5: 010=Mono, 100=Color, Bit 0 : Card Enable (set by reference diskette) */
-    da2->ioctl[LS_CONFIG1] = OldLSI | Page_Two;              /* Configuration 1 : DA-II, 1024 KB */
+    da2->ioctl[LS_CONFIG1] = Page_Two;                       /* Configuration 1 : DA-III, 1024 KB */
     da2->ioctl[LS_CONFIG1] |= ((da2->monitorid & 0x8) << 1); /* Configuration 1 : Monitor ID 3 */
     da2->ioctl[LS_CONFIG2]         = (da2->monitorid & 0x7); /* Configuration 2: Monitor ID 0-2 */
     da2->fctl[0]                   = 0x2b;                   /* 3E3h:0 */
@@ -3270,7 +3277,7 @@ da2_init(UNUSED(const device_t *info))
     da2->vram              = calloc(1, DA2_SIZE_VRAM);
     da2->cram              = calloc(1, DA2_SIZE_CRAM);
     da2->vram_display_mask = DA2_MASK_CRAM;
-    da2->monitorid         = device_get_config_int("montype");       
+    da2->monitorid         = device_get_config_int("montype");
     da2->changedvram       = calloc(1,  (DA2_MASK_VRAMPLANE + 1) >> 9); /* XX000h */
 
     da2->mmio.charset = device_get_config_int("charset");
@@ -3288,7 +3295,8 @@ da2_init(UNUSED(const device_t *info))
     }
 
     mca_add(da2_mca_read, da2_mca_write, da2_mca_feedb, da2_mca_reset, da2);
-    da2->da2const = (uint64_t) ((cpuclock / DA2_PIXELCLOCK) * (double) (1ull << 32));
+    da2->pixelclock = DA2_CLOCK_58MHZ;
+    da2->da2const = (uint64_t) ((cpuclock / DA2_CLOCK_58MHZ) * (double) (1ull << 32));
     video_inform(VIDEO_FLAG_TYPE_SPECIAL, &timing_da2_mca);
     memset(da2->bitblt.payload, 0x00, DA2_BLT_MEMSIZE);
     memset(da2->bitblt.reg, 0xfe, DA2_BLT_REGSIZE * sizeof(uint32_t)); /* clear memory */
@@ -3436,7 +3444,7 @@ static void
 da2_speed_changed(void *priv)
 {
     da2_t *da2    = (da2_t *) priv;
-    da2->da2const = (uint64_t) ((cpuclock / DA2_PIXELCLOCK) * (double) (1ull << 32));
+    da2->da2const = (uint64_t) ((cpuclock / da2->pixelclock) * (double) (1ull << 32));
     da2_recalctimings(da2);
 }