As I do more digging into these machines, I am pretty sure that the 5300 Series would additionally be firmware limited to a 4x multiplier – so 133MHz max on the 33MHz bus.
So it's a XC9536 In-System Programmable CPLD on these 603e upgrade cards. I'm guessing there's no way to get the bitstream off that, due to protections.
Think I figured it out. That Xilinx chip (CPLD or FPGA) is there to enable multipliers above 4x to work, i.e. to be to use a processor at above 133MHz. It’s the only reason I can think of why the 100 and 117 PPC cards don’t have this but the 167 and 183 do.
The PowerBook 1400 Series has the...
They do… both @Phipli and I noticed ‘shimmering’ (like a sort of noise) on our Radeon 7000 PCI cards’ display output, that recapping fixed.
I’d be surprised if bad caps caused something like the extreme corruption I’m seeing on my R9000, though.
I put the card back in my PC and restored the original BIOS - the same corruption is there, works fine at cold boot - symptoms appear after 20 mins and get progressively worse.
So it’s just a dud card.
The ROM I’ve used sets the VRAM to 250MHz, and the VRAM is rated at 3.6ns/275MHz. So it’s already clocked conservatively. Don’t you think it’s more likely that one of the chips is bad?
I've been tinkering with the card a little more now that I've got my M1297 recapped and reassembled. It's actually misbehaving in both my Apple and Reloaded boards. I could not get it to work initially but after reseating it and power cycling it several times, it finally started working. Really...
I’ve just flashed a PC Radeon 9000 (Pro?) 64MB AGP with the 136 ROM and it works fine.
On my first attempt I got a screen full of garbage too. My card looks the same as yours except that it has a switch populated at SW1 next to the VGA connector. I see your card has the pads, but no switch...
@Phipli I hear you regarding the cost of … everything. My symptoms were that the computer’s front light would light up momentarily when pressed and then nothing. A few of the caps were noticeably bulged. I replaced everything apart from the three large bulk caps and it sprang right to life after...
What PSU does the Quadra 800 use? The motherboard connector for Q800 is the older IIcx style 10-pin. 840AV and 8100 use 22-pin. But the PSU has a detachable harness so maybe it just uses the same PSU with a different harness.
Edit: found a pic of the Q800 harness:
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