This is the original GVP Impact (Series I) disk controller technology. It is based upon a 33C93/33C93A 8-bit SCSI controller which transfers data to/from an on board 16K SRAM buffer (4K on the original revision), which is then serviced by the CPU. The board has space to mount a 3.5" hard disk with a short 2-3" internal 50-pin ribbon cable. SCSI bus termination resistor packs are soldered in. Early controllers have a diode for SCSI bus power that may burn out if a device also supplies power. Ribbon cables have also burned that line in some cases. The diode was left out in later builds to prevent this. Typical SCSI disk drives shipped on the card included Quantum 40S/80S, Seagate 20M, 30M, 45M, and Miniscribe 20MB. GVP 1.0, 2.x, and FastROM 3.x is supported for AutoBoot. Related models in this line supporting RAM include the GVP Impact HC+2, and the non-hardcard GVP Impact SCSI+RAM products (1/x, 2/x, 8/x) with various RAM configurations combined with a 33C93/33C93A 8-bit SCSI controller.
Connectors
| Connector |
Function |
| CN1 |
LED Connector |
| U3 |
Autoboot EEPROM |
| J4 |
Auto Booting |
| CN2 |
50pin SCSI Connector |
Note: Most boards shiped with a 33C93 SCSI chip. Use of the 33C93A SCSI chip (as a replacement) will be detected by FastROM 3.14/3.15 and expect 14MHz clocking of that chip which is not possible on Series I cards except the SCSI+RAM 8/x. Use a v3.12 FastROM (gvpscsi.device) in this case for booting, or boot from another device (without the ROM active), place the GVPSCSI driver in the SYS:Expansion drawer, and make sure the driver's icon tooltype indicates 7MHz.