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