*** M E M O R U M ***

For anyone wanting a 6x09 system, without the complications of a full Dragon build - video output, keyboard etc. There always Grant Searle's simple system which has a 6809 variant. http://searle.hostei.com/grant/6809/Simple6809.html Although with the HD6309EP that Lez sent me, you'd need some additi...

By default, simple variables get parked in the shared ram from #C000 up. There's only a 2 byte pointer I guess they then get moved further up if a basic program needs that space. Arrays on the other hand have a 3 byte pointer and live in paged ram, with I think a maximum size of 64k per array, as th...

I have a copy, which isn't for sale. Sorry!

However,if you can't get one for yourself, it may be possible to copy some of the content.

a DAT or ROM type would be nice, I tried posting a rom a while back, and ended up renaming it as a PDF I think !

Bit 0, of register 0, is the external video enable. I would have thought that was meaningless on a 9928A or 9929A ??? as the composite video input pin was removed to allow for the colour difference signals.

Text mode on the 9918(A)/28A/29A shouldn't cause any issues on either clock rate, as the minimum separation between VDP accesses is 2us. That's 8 cycles at both 3.58 and 4 mhz Graphics modes however the data sheet says 8us is required, so a 3.58mhz CPU has to leave 29 cycles. The 4mhz CPU has to lea...

That looks like 8080 derived code.

The Z80 has both LD (nn),SP and LD SP,(nn) to save and load the stack pointer to memory without involving HL.

It could be this one ?? Its been a while since I played it!

https://en.wikipedia.org/wiki/I_Do_Like ... he_Seaside

no sound output available on the MTX right now to check.

Jim won the Turbo high score competition at Memofest 2018 with a score of 3200. Can YOU beat that ? Here the result of extensive practice (ie more than 5 mins), is my best score in a LONG time, (mainly because, like everyone attending Memofest, before this weekend I'd not played it in a long time!) ...

And there were other things I forgot to mention in last night's hasty write up. Andy's video wall plans :shock: The under £10 component tester - just Google LCR-T4 CFX4 and why I gave up on the development Our thanks to everyone that contributed to the food mountain - Bill you missed the pizza + ice...