Altair8800: New Devices and Bug Fixes

This update to the Altair8800 simulator includes:

Adds MITS hard disk controller device
Adds FarmTek FDC+ disk controller device (1.5MB)
Adds iCOM 3712/3812 disk controller device
Adds Processor Technology VDM1 video device
Fixes boot bug in TARBELL and VFII devices
TARBELL returns 0xff for DMA status if 1011
Fixes DAZZLER vertical blank status timing
Adds DDT command to control DDT-style output
Improves MEMORY dump display

makefile

@@ -2250,10 +2250,14 @@ ALTAIR8800 = \
     ${ALTAIR8800D}/s100_rom.c \
     ${ALTAIR8800D}/s100_z80.c \
     ${ALTAIR8800D}/cromemco_dazzler.c \
+    ${ALTAIR8800D}/farmtek_fdcplus.c \
+    ${ALTAIR8800D}/icom_fd3x12.c \
     ${ALTAIR8800D}/mits_2sio.c \
     ${ALTAIR8800D}/mits_acr.c \
     ${ALTAIR8800D}/mits_dsk.c \
+    ${ALTAIR8800D}/mits_hdsk.c \
     ${ALTAIR8800D}/pmmi_mm103.c \
+    ${ALTAIR8800D}/pt_vdm1.c \
     ${ALTAIR8800D}/sds_sbc200.c \
     ${ALTAIR8800D}/sds_vfii.c \
     ${ALTAIR8800D}/tarbell_fdc.c \