There is a Retina BLT Z3 on eBay. I am looking for someone who has hands-on experience with this board. It is based on the NCR 77C32BLT and I have found some specs on the chipset, but what I have found does not match up to what I am told the card can do, spec-wise.
I need a card which can do 24 bit color, non-interlaced, at 1024x768 or 1152x864, to replace my Spectrum 28/24. (The higher resolution might actually be 1152x900, but I rarely use this mode and cannot recall if x900 is a Mac/Sun specific resolution.)
I guess I could just hold out until I find another Picasso IV, but those do not seem to pop up very often.
Edit: Changed wording so it is clear that the Spectrum does not do the modes I need.