Where to find memory ICs?

This interface was, of course, avaiable as an option for the PERQ (all models). The normal PERQ OIO (Optional I/O) card could be populated with either or both of an ethernet interface and a Canon CX-VDO laser printer 'video' interface. On the PERR, of course, the graphics 'raster op machine' was used to generate the laser printer bitmaps, the interface consisted of a FIFO buffer and a little state machine to control it and synchronise it with the printer. I have my home-made CX-VDO printer. It started off as a Canon LBP-8A1, the formatter board failed and after many long nights of tinkering with the mechanism, staring at a logic analyser and 'scope, looking at the PERQ , etc, I got it going as the VDO model (no internal formatter board). The 'video interface' is just the interface on the 34 pin header on the engine controller (DC controller board) in a Canon CX printer. Now that CX toner cartridges are essentailly unobtainable, I've been wondering if any other printers supporr this interface? I know there was a version of the SX (Laserjet II etc) which had a PCB of buffers in place of the intenral formatter board and which had video interface which was claimed ot be much the same thing. Alas that version seems very hard to find. Was it supported on anything later? -tony