A500 HD8+
A500 HD8+ with PSU
A500 HD+ with PSU
A500 HD+
A500 HD+, Top view
A500 HD+, Rear view
Hi Res Version, A500 HD8+
- 864 x 616, 38K
Image showing inside the unit
- 1755 x 1167, 188K
Image of Rev 6 motherboard
- 2914 x 1596, 1,102K
Image showing Box
- 2964 x 1496, 682K
Hi Res Version, A500 HD+
- 1226 x 1224, 253K
Image showing left side
- 1860 x 447, 149K
Image showing right side
- 1887 x 486, 158K
Image showing PSU
- 1324 x 1206, 177K
Dutch manual
- 2,545K

The GVP Series II HD8+ and HD+ (*) is a high performance SCSI controller and memory expansion for the A500/+.  It connects to the left side expansion slot of the A500/+, and closely matched the case aesthetics. The unit has 4x 30-pin SIMM sockets that can utilize up to four 1Mx8 or two 4Mx8 SIMM modules. A power supply for the GVP unit is required unless an A500 PSU with upgraded 5v/12v ratings is used.  This unit does not use the GVP SIMM32 modules.  Early units may have had labels with 'Impact' on them, but all will have Series II in the name.  The [GVP A530] is a different product, with a 68030 processor and uses different RAM.

(*) The products are identical/same internals although the product label changed at some point.  They all had Series II identification.  Early models had the old 'Impact' marketing name.

  • 2/4/8MB, zero-wait state, FastRAM controller and ANSI XT3T9.2 compatible SCSI interface.
  • GVP Dual Port RAM Controller w/High performance DMA transfers to and from hard-disk.
  • SCSI data transfer rates of up to 3.58MB/sec.
  • Auto-configuration for both Fast RAM and SCSI interface.
  • Internal 50-pin SCSI connector, External 25-pin SCSI connector (DB25).
  • Internal expansion slot for an 80286-based PC emulator card
  • FastROM 3.x/4.x, can be disabled with switch for game compatibility.  Compatible with GuruROM.

 

Memory SIMM Location J5 J6 J7 J8 J9 J12
0 None OFF OFF ON ON OFF Front
2 CN9-CN10 OFF ON OFF ON OFF Front
4 CN9-CN12 ON OFF OFF ON OFF Front
8 CN9-CN10 ON OFF OFF OFF ON Rear

Power Connector Pinout:



Looking at the back of the unit:

   1     3
    4   5
      2

1  Earth Ground
2  Signal Ground (5V ground)
3  +5V RED
4  WHITE (not connected)
5  +12V BROWN