4.15 gvpscsi.device ROM

[Grega]

Hi

I'm trying to find this in a format which is 16KB and not 45KB.
On Ralphs site the .bz2 file extracts to be 45KB in size.
The ROM data should be 16KB i suspect as a binary file ; however, when stacking it to put on a 27C512 64KB EPROM x 4 times it doesn't quite work out for me.

I've seen folks have issues with burning this as well there was an alternate site i found that had this for a 27C256 but its gone now.

I have a GQ4X and have burnt to these chips before with no issues ; this I just can't suss out. Any ideas where I am going astray?

[Forcie]

The 45 kB gvpscsi4.hex file is not a binary ROM image. It is provided in Intel HEX, an ASCII format commonly read by most EPROM burning software. This is why the file is bigger than the actual data written to ROM. Ralph B even mentions this in the comments on his page.

Read more here: https://en.wikipedia.org/wiki/Intel_HEX

[Grega]

yes dude, i know, when i open it in the software as hex and save it as binary it becomes 16KB. so all good.

the problem is when i stack the 16KB binary files to be 64KB on the 27c512 ROM, it does not work. this i can't figure out mate.

[Castellen]

If it helps, I have these:
GVP_HC+8scsi_v4-15_27C256.bin
GVP_HC+8_SCSI_Controller_v4.5_ROM_27256.bin

Pretty sure I've used the first one before and it works fine.  I seem to recall the v4.5 second one didn't work, don't remember the detail.

To use with a 512k EPROM, just concatenate the binary image once.  Or just write it as is and make sure the MSB address line is tied low.  If the MSB address line is left floating, the EPROM might do unpredictable things, even if you have the same image in both upper and lower halves.

[Grega]

Castellen, many, many thanks.
I think I sussed it though. ie:
I took the 45Kb HEX image, converted to binary which gave me a 16Kb file.
I opened that in the GQ4X software and copied the block of data to the end of 16Kb.
I then took the 'read' original ROM in the GVP and loaded that, and pasted it 4 times to the chip in the respective correct memory locations to make a 64KB file.
Note the tail end of the GVP ROM ends with two lines of 00 (not FF) so i matched those OK.
I get a boot operation fine with the standard 50MB Quantum SCSI drive BUT i don't get a boot condition with the 1GB Quantum SCSI drive - which could be due to jumpering - jury is out at this stage.
I will have a look at the images you've pointed me at to see how they compare.

Thanks again mate!

[Grega]

yes. that seems to be working now; in that I can see the drive in HDtoolbox and partition it. win. a good result.
FWIW i took the GVP_HC+8scsi_v4-15_27C256.bin and basically did a (in windaz 10) copy /b GVP_HC+8scsi_v4-15_27C256.bin+GVP_HC+8scsi_v4-15_27C256.bin GVPNEW64KB.bin - then burnt GVPNEW64KB.bin to a 27c512 ROM.
in with the ROM and off we go.
note: my drive is a quantum 1080S - 1GB SCSI 'Fireball' --> I have A2 and A1 jumpered (default) and TE jumper set. The PK jumper is removed.
only issue I have now is trying to get the bloody OS on there LOL ; i reboot and the GVP just sits there with the hard disk light stuck on going nowhere. the usual 2 finger mouse to select boot doesn't seem to work either. oh well. further than I've been

thanks heaps.