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 and modifications to the PCB pads are made.  This unit uses standard 30-pin SIMMs, and 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 raw 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 v6.

 

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