Re: >For the ROM slot? IIRC it only has 16 address lines, i.e. yes, it can >only have 16kb.
That would be 14 address lines, addressing 16384 bytes i.e. 16k. Marcel, you are getting old ;-) =========================== Now boys this is *not * my area... but...... QL ADVANCED USER GUIDE - Adrian Dickens - Repr. June 1985 @ p 298ff: Appendix C - Plug in ROM spec...... Introduction .................................. ........... Hardware connections A variety of useful signals are provided from the RUM slot. The 16 address lines allow up to 64K bytes of RUM to be addressed, but in practice there is only a 16K byte slot available in the memory map (see Appendix A). The data lines allow bytes to be transferred from the RUM to the 68008 microprocessor. ROMOE is an active low signal which enables the RUM for output whenever the 68008 tries to read from it. Finally, there are the two power supply lines at 0 and +5 volts respectively. The layout of the signals is illustrated in figure C. 1 below. ROM software specification There are several aspects of plug in RUM software. Firstly, there must be a special recognition sequence which QDOS can test. If the sequence is there, it is fairly reasonable to assume that the.................. ============================= Blasted OCR needs drying out! Regards to all, John in Wales
