[jan-jaap]

Hey Jan-Jaap,

I believe we have had this topic on Nekochan forum a while ago. But if the GT boardset is generally okay, we need to find an IP4.
From Alex Corda's FAQ you need a 12.5 MHz R2000. But i guess you aren't picky and would be happy with anything.

I remember several years ago the shop VT100 in The Hague, who had a blue-hat twin-tower in the window of the store. No idea where that critter went. Also, no idea where that shop went as well They had some groovy vintage stuff.

From Gerhard's site this snippet is interesting: "Apparently Clover 1 graphics subsystems were common on 4D/50, 4D/60 and 4D/70 systems while Clover 2 was usually found in the newer 4D/70, 4D/80 and 4D/85."
So this seems to indicate that the GT was delivered with newer 4D/70 systems, and therefore your assesment of a PROM version difference seems plausible.

Any luck with memory tests on the GT diagnostics port?

I think VT100 disappeared years ago. Blue tophat means VGX so that was probably a PowerSeries. I've got enough of those

This system came to me as a 4D/50 GT, so it had an 8MHz IP4 (030-0121-001). I later bought a 12.5MHz IP4 CPU board (030-0011-001), so from a 4D/70. Both have the same firmware part#: 070-009x-010. The photo on Gerhard Lenerz site shows an IP4 from a 4D/50 with 070-009x-009 firmware, apparently that system has "G" graphics.

Here are some photos, beware they are 2MB each:

IP4 w./ 8MHz R2000 (4D/50), part# 030-0121-001



IP4 w./ 12.5MHz R2000 (4D/70), part# 030-0011-001


There are also a lot of jumpers on these boards. My 4D/50 board seems to match the board on Gerhard Lenerz site.

I didn't connect to the GM1 diagnostics port yet. Tried that once with a VGX and I didn't get very far.