| Processor: |
040@33MHz |
| FPU: |
Internal |
| MMU: |
Internal |
| Max Ram: |
64MB |
| Ram Type: |
4 x GVP 64pin SIMM32 modules. |
A 68040 accelerator for the A2000 which is designed to plug into the CPU Fast slot.
The card takes the custom GVP 64pin SIMM32 modules which are not compatible with the various other 64pin and 72-pin SIMM formats which existed at the time.
The card contains a 33C93A-based SCSI-II controller providing both an internal 50pin connector, and an external DB25 connector via a backplate that connects to CN4, with 3 removable SCSI termination resistor packs located above the memory modules. The card has a 9pin serial port and 25pin parallel port on the card backplate. The parallel port can be configured to operate like a convential Amiga parallel port, or more like a PC parallel port. The serial and parallel port operate identical to the I/O Extender product, and the ports stack nicely when the Zorro II cards are in the system.
The card also contains a connector on the back side for attaching the GVP EGS 110/24 graphics card.
Jumpers
| Jumper |
Open |
Closed |
| J2 |
Reserved (Default) |
Reserved |
| J3 |
Reserved (Default) |
Reserved |
| J4 |
SCSI Enabled |
SCSI Disabled |
| J5 |
Disabled Autobooting |
Enable Autobooting (Default) |
| J7 |
Disable MMU |
Enable MMU (Default) |
| J8 |
Reserved |
Reserved (Default) |
| J10 |
Reserved |
Reserved (Default) |
| J15 |
Reserved (Default) |
Reserved |
| J16 |
Reserved |
Reserved (Default) |
| J17 |
Reserved (Default) |
Reserved |
| J18 |
Reserved (Default) |
Reserved |
| J19 |
Reserved (Default) |
Reserved |
| J20 |
16MB SIMMs Installed |
4MB SIMMs Installed (Default) |
| J21 |
Reserved |
Reserved (Default) |
| J22 |
Burst On |
Burst Off (Default) |
| J24 |
Reserved |
Reserved (Default) |
| J26 |
DTACK Off (Default) |
DTACK On |
| J27 |
Reserved |
Reserved (Default) |
Note: Jumper 26 corrects a flaw which may exist in early 4.x versions of the A2000. If your A2000 is Rev 4.3 or earlier, J26 should likely be closed. This jumper provides an additional pullup resistor on the DTACK signal (use only if needed for stability).
| Jumper |
Pins 1&2 |
Pins 2&3 |
| CN6 |
Hard Drive LED |
Hard Drive LED |
| CN9 |
Use Amiga Style Parallel Port (Default) |
Use PC Style Parallel Port |
| CN11 |
Reserved |
Reserved (Default) |
| CN12 |
Reserved (Default) |
Reserved |
| CN19 |
Reserved |
Reserved |
| CN20 |
Reserved (Default) |
Reserved |
This board supports the FastROM 4.x, and the GuruROM V6 3rd party upgrade driver. Details on the SCSI interface and driver can be found on the GVP HC8 Series II SCSI controller page.
This board maps all memory at a >16MB address range via the driver ROM. 1-4 4MB SIMM32's provide up to 16MB. 1-4 16MB SIMM32s provide up to 64MB. With 4 modules of the same type, burst mode is supported, improving memory performance. Modules should be all of the same size, or gaps will appear in the (normally) contiguous memory map. A single smaller SIMM should be in the last (lower) slot if that is all that is available.
This board can use the C= 68040.library, or the MuLibs 68040.library. Of the original C= 68040.library releases, the V44.2 release from the OS 3.9 upgrade offering is considered the most stable, followed by the V37.30 available from the A3640/A4000 support media. GVP media may have earlier V37 versions. The MuLibs 68040.library package is actively supported and recomended, and available on Aminet (Search on MuLibs).
The support tools for the board include GVPCPUCtrl, of which the FastROM and MoveSSP options are recommended to enhance performance. You may also use the MuLibs support tools that perform similar duties. Support media images are available for download from GVP-M.COM and the latest v4.x driver ROM is available from the driver writer's website.
This board is supported by the GuruROM V6 3rd-party upgrade driver.
BOM details from internal GVP documents can be found here: https://archive.org/details/gvp-bom-a-2000-040