Technical data

How does it work?

DREM is based on the high performance FPGA platform and does not require the use of a PC for any file encoding operations.

DREM uses DSK disk image files, which contain the raw dump of a disk. The raw image consists of a sector-by-sector binary copy of the source medium. Since DSK files hold no additional data beyond the disk contents, DREM uses an additional CFG file to obtain disk geometry and encoding information.

DREM is equipped with an VGA output, PS/2 keyboard input and file manager software. A user can browse the SD card and insert DSK images into virtual drives. Use of a monitor and keyboard is optional: DREM may load default configuration from file on power up. With an optional VGA monitor and PS/2 keyboard users may access a live transaction log and monitor drive activity in great detail. At any time a user may start or stop capturing log data into file on the SD card, which is very useful for analyzing low level format information.

DREM comes with many CFG files for frequently used host computers. However, if you are not quite sure about the low level format for a particular host, DREM will provide an analysis in a log file captured during low level format (LLF) operations

Technical Specifications

Dimensions: 170 mm x 125 mm

  • Fits 3”5 PC drive bay

Power: 5VDC 640mA via one of the following:

  • 3”5 PC MOLEX connector

  • 5”25 PC MOLEX connector

  • NeXT FDD Interface

  • JVC 26pin HDD Interface

Computing platform

Xilinx Spartan 6 XC6SLX25

  • 128Mb SDRAM

  • Microchip PIC24F

  • RTC

Power up ready time: 7 sec.

Storage:

  • SD or SDHC Card FAT32 (or miniSD, microSD cards via appropriate adapter)

  • Most types and sizes are supported. Usable space is limited to 32GB (FAT32 limitation)

  • SPI 20/40 Mbit/s

Monitor (Optional): VGA 15-pin 640x480 60Hz 31.2KHz

Keyboard and Mouse (Optional): PS/2

Interfaces

FDD:

  • 34-pin (17x2) 2.54mm pitch male IDC pin header

HDD:

  • 34-pin (17x2) 2.54mm pitch male shrouded IDC pin header +

  • 2x 24-pin (12x2) 2.54mm pitch male shrouded IDC pin header

JVC 26pin HDD:

  • 6-pin (13x2) 2.54mm pitch male shrouded IDC pin header

DEC RLV12:

  • 40-pin (20x2) 2.54mm pitch male shrouded IDC pin header

FDD Emulation

  • Interface Modes: Shugart/IBM-PC/Amiga/NeXT/DEC RX50

  • Number Of Drives: 4

  • Encoding: FM, MFM, FM/M2FM(MMFM) Mixed mode

  • Bitrate, bps: 250K, 310K, 500K, 1M

  • RPM: 150, 288, 300, 360, 600

  • Sides: SS or DS. Possible to load two SS images into DS drive.

  • Pre-compensation: None, Low, Hi

  • Sectioning: Soft and Hard

Supported devices

  • AED FLEX0

  • Agath 840K (DSK and AIM)

  • AMIGA (drive identification supported)

  • DEC 8in RX01/RX02 Compatible Controllers (FM and M2FM)

  • DEC RX50, RX33

  • DVK MX

  • ​Data Systems Design DSD4140

  • Dilog DQ419

  • E-Mu Emulator II

  • Elektronika BK, MC-0511 (aka UKNC)

  • Heathkit H17

  • HP-86A (HP 9130A)

  • HP 9153 A/B/C

  • ISO, IBM (any possible sector size)

  • KR1801VP1-128 based: DVK MY

  • Lvov PK-01 (DSK and special virtual disk modes for LVT files)

  • Micro Development Associates MDS MXV21

  • Nemiga MD (DSK and MD)

  • NeXT

  • Northstar Advantage

  • Sigma Information Systems SDC-RXV21 SDC-RXV31

HDD Emulation

  • Interface: ST-506/ST-412, JVC 26Pin, DEC RLV

  • Number Of Drives: 4

  • Encoding: MFM, RLL(2,7), ARLL

  • Bitrate, bps: 4.1Mbps, 5Mbps, 5.5Mbps, 7.5Mbps, 9Mbps

  • RPM: 2400, 2597, 3000, 3600

  • Heads: 1 – 16

  • Cylinders: 2048 max

  • Pre-compensation: None, Low

  • Sectioning: Soft and Hard

Supported devices

  • Adaptec ACB-4000 (E-Mu Emulator II+HD)

  • Adaptec MFM ACB-2010A

  • Adaptec RLL ACB-2372B

  • Adaptec RLL ACB-2070A

  • Adaptec RLL ACB-4070 and compatible (Atari Megafile)

  • Compupro Disk 3

  • Corvus H Drive

  • Data General DG/20

  • DTC WD1010 compatible controllers

  • DTC WD2010 compatible controllers (i.e. DTC-7180)

  • DTC-5160 RLL

  • DEC Pro-3xx RD

  • DEC RQDX3, RLV

  • DVK DW

  • Elektronika MC-0585 (aka Elektronika 85) RD

  • IBM 1501492 (XEBEC)

  • IBM 5170 WD1010 , PC JX (WDC1010A) compatible controllers

  • Intel 8206 and 82062 based controllers (WD2010 compatible)

  • Heathkit H17

  • NCL NDC

  • NEC-16T (PC-9800)

  • Neve Mixing Console (GML Idris)

  • Northstar Advantage

  • Perstor Systems Inc. ADRC9008 (ARRL 9 Mbps)

  • Poisk-1 B942

  • SMC HDC9234 based controllers(TI-99/4 Myarc HFDC)

  • Seagate ST11M MFM, Seagate ST11R, ST-21R, ST-22R RLL

  • SMS OMTI Series 5510, 5000 and 20 (AMIGOS / PROMIGOS)

  • SMS FWD8006 HDD+FDD Multubus

  • Western Digital WD1010 based controllers (any sector size, CRC16)

  • Western Digital WD2010 based controllers (any sector size, CRC16 and ECC32)

  • Western Digital WD5010 based controllers (any sector size, CRC16 and ECC32)

  • Western Digital WD5011 based controllers (any sector size,  CRC16 and ECC32, ECC56 RLL)

  • Western Digital WD50C12 based controllers (any sector size,  CRC16 and ECC32, ECC56 RLL)

  • Xebec

  • Xerox Rigid Disk

  • 26pin JVC-SMS OMTI hard sectored (EPSON Equity LT)