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DayStar Diskrunner info?

zigzagjoe

68060
Came across one of these on el-bey and it was odd enough I couldn't resist. Connector on the end is for Daystar's XCI bus, onboard SIMMs are for disk caching, up to 16MB. Supposedly the card is also DMA capable but they might just be referring to what the 68000 is up to. However, there's a ridiculous amount of PALs on this so it could be up to some interesting things.

I've dumped all 3 ROMs; 4216 is the DeclROM, the other two are the 68000 ROMs and I've also combined them into a single file for disassembly's sake. Upper and Lower are named for physical location on the board rather than logical in memory as there's no designations for the ICs on the board. Interestingly, the DeclROM and Upper/Lower ROMs are each only 8KB in size. Seems like a relatively lightweight amount of code, to be honest. It seems like daystar may have used 27C128s for those as they've deliberately bridged A13 to ground (via 27, ~P).

As was described, the card shows up in TattleTech and nothing else. No driver is loaded for it. System 6 vs 7, 32-bit vis 24 bit, no difference. ZuluSCSI sees no activity on the SCSI bus so seems like we're failing presumably somewhere in initialization rather than a disk format problem. I haven't taken a look at the structure of the DeclROM yet. All 3 Oscs are at least working correctly and new RAM doesn't change anything. It's a very, very power hungry card too.

So: does anyone have any info on this card, specifically manuals or images of the original disks? The only download from Daystar's site is a lone application and some release notes which suggest to me that it may not be a patch rather than a standalone distribution. The application just crashes.

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You've probably already seen this, but just in case -- there is a "Soft DiskRunner" (?) driver here:

https://macintoshgarden.org/apps/daystar-digital-drivers-control-panels-and-related-software
Yep, that's the one that just crashes. The card should be bootable without any additional software as it has a BootRec, though I haven't taken apart the ROM in earnest to figure out what it's actually up to.

I do wonder if it's related to the XCI interface being populated - so far the only two cards confirmed to work both don't have it present and two GALs have been replaced by pull-up resistor packs.
 
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