Recent content by tsillay

A bit of an update on work to date. To summarise, replacing the 31ish mhz xtal with a 40mhz xtal kind of works, but no ADB mouse, and there's a fairly predictable bus error after 20 mins of operation after which the machine won't warm boot (it needs a power cycle to come back) I scored a 40...

I've been worrying away at overclocking instead. Hey did anyone get the Radius Control Panel working on the SE30?

I've disabled onboard video by pulling ue7. This kills video Rom/ram addressing and video sync to crt So. Se30. IISI Rom. 20mb ram. System 755. Rcpiisi video at 640x480. Softpivot drivers and control panel don't load so using 'monitors' ctrl panel. 40mhz can xtal. 16mhz 030 and 882. It's...

Unbelievably, it almost works. Using a 40mhz xtaI. I didn't expect scsi or adb to fly. (20mhz bus) No mouse. Kbd ok. Rcpii ok. Sound is up an octave or so. It boots hellish quick!! I've got a 33mhz 030 and 882 on the way .

Good to know. But still, inadvertently changing your resolution in the radius control panel, therefore changing hsync frequency could be messy?

I've got a 32,40 and 50mhz arriving today. Also just discovered silicon oscillators, which are programmable. If I could find a 5volt version I'll go that way. Check my comments on the greyscale thread regarding the relationship between the vsync clock and the CRT hi voltage... Over clocking...

A thought came to me.. I assume the CRT high voltage is generated from the vsync pulse and flyback xformer. (I dont have a circuit to confirm).. We need to be VERY CAREFUL with the frequency of the vsync pulse, even a casual screen resolution change in the control panel could toast your analog...

Electrically it works fine.. Techknight, I was also going to build an SE30 riser with two female sockets on it. It will allow us to use non-passthrough cards...

No, you can't make the IISI card appear as slot $E. There are two things needed to make this work 1: address decoding. You've got to make the declrom appear at $FExxxxxxx, and all the decoding for this space happens on the SE30 Mobo 2: interrupt handling. You've got to get the vbl interrupt...

I've also noticed things seem to slow up a bit when driving two video cards. (However I've got that crazy address decode prob and have 4 monitors showing) However, if you pull out the onboard declrom, then make the rcpii screen primary, the thing is quite snappy. Now considering you don't use...

It strikes me you shouldn't need any electronics to make a pds expander for the se30. (Emf type filtering aside). A simple pcb with one male right angle and two female straight din's appropriately spaced should let you put two non-passthru type cards in where the hard drive lives. You repo the...

Good Sh*t Guys..!! I've got a couple of pds riser cards on the way, and one of Doug's rom burners. Next stop, internal grayscale.. It's gonna have to wait until after the hols for now.

Thanks.. Even with nothing in the expansion slots, the onboard SE30 screen appears 4 times in the monitors control panel. The ethernet card (irq9) has a utility that lets you look at what's in the slots. it shows the onboard video in slot 2,6,A,E.. So my logic goes something like... - the...

Wiring is exactly the same as was discovered above. With sense 0 and 2 tied it thinks an RGB16 is connected, so runs at 832/624. The LCD just hangs onto it... The 'pivot' column corresponds to the pins on the rcp card connector , the 'vga' column to the pins on a d15f vga socket... PIVOT VGA...

Ah. I totally missed that. I thought that ebay card was the Nubus adaptor card for the IIsi and would have all sorts of things I dont need.. I took a bit of ribbon cable, soldered it direct to the rear of the 15 pin connector on the card. I wired the other end straight to a vga style D15...