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Old 25th Mar 2020, 5:49 pm   #12
Slothie
Octode
 
Join Date: Apr 2018
Location: Newbury, Berkshire, UK.
Posts: 1,287
Default Re: MK14 memory upgrade

Quote:
Originally Posted by Timbucus View Post
With support for Paging we could run NIBL BASIC - also prepared but, unreleased. Probably the modified one for the Elektor which RAN in Page 1 so had only upto 6 pages of RAM it could use.
Support for paging would be simple in principle as it means latching the data bus when NADS goes low->high complicated only by having to mod the MK14 to only use page 0 for its devices. There's room saved on the bus for the upper 4 address bits. The best way I've seen for this is intercept the MK14 NRDS and NWDS signals so the devices on the MK14 don't see them when page isn't 0. This would require a signal back from the memory board but there are enough free pins. I think there was also a couple of spare gates that could be pressed into service.... It all depends if the effort is worth it
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