GVP 040 combo for A2000

[johnroberts]

just recieved 1 of these and it appears dead(came out of a working system so told) any help appreciated. my motherboard is rev6 and the gvp is rev 6. tried jumper settings but nowt is happening

[rkauer]

Quoting from The Big Book of Amiga Hardware:

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 DTAK Off (Default) DTAK On
J27 Reserved Reserved (Default)

Note: Jumper 26 corrects a flaw which exists in old versions of the A2000. If your A2000 is Rev 4.3 or earlier, J26 should be closed.

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

[rkauer]

And quoting Amiga Hardware Database:

# memory four 64 pin SIMM sockets accept 64 MB RAM
# supports only special 4 or 16 MB GVP SIMMs
# SIMM sizes cannot be mixed
# 040 burst mode requires all four sockets to be filled up

jumper settings
J4 - SCSI drive: OFF - connected
J5 - autoboot ROM: OFF - disable
J7 - MMU: ON - disable
J20 - SIMM size: ON - 4 MB, OFF - 16 MB
J22 - burst mode: OFF - enable
J26 - DTACK pull-up for old A2000s: ON - enable

[johnroberts]

tried these already thanks but still poorly

[rkauer]

Does the board came with memory sockets fully populated? Are the memory SIMMs ok?

Does the 040 heats a lot?

[johnroberts]

no the chip seems pretty cool and there are 3 gvp simms on board i`ve tried them all together in pairs and by themselves still nothing all simms are 4megs

[rkauer]

If the 040 is cool (or even slightly warm), then you could have:

a) the oscillator crystal fall out the socket;

b) a busted CPU.

Check the crystal to see if it is in place and firmly attached and pray the CPU didn't busted for the lack of clock.

Also (carefully) pull off the 040 and reinsert it.

[johnroberts]

the chips and crystals are soldered on and all joints look as new

[Zetr0]

will the Amiga boot to work bench with the card installed?

I am wondering if you can access the early boot menu, pending on the kickstart rom you are using to see if the card is there to be used.

Good luck with this

[johnroberts]

she`s now working memory could be a bit dodgy though will get round to testing this weekend but the board chip and scsi are all there which is a bit step. don`t know what i did though. just need gvp memory now

[a_petri]

Originally Posted by johnroberts

she`s now working memory could be a bit dodgy though will get round to testing this weekend but the board chip and scsi are all there which is a bit step. don`t know what i did though. just need gvp memory now

Did you remove and reinsert the GVP SIMM modules several times? If you did, then it may well be that it did the trick.

The 64-pin SIMM sockets of the 030 and 040 GVP Combo accelerators I've seen so far were all rather fiddly - the SIMM modules tended to wriggle out of them eventually. (My current A2000 has the wires coming out from the PSU arranged strategically to keep the SIMMs in their place....)