No sir, the 65C816 in the II GS is not static and as is the case with all 65Cxx MPUs, the clock can only be safely halted on the high phase. The II GS went out of production about a year before the release of the static-core 816.

You're absolutely right and I'd forgotten that. I stand/sit ...

Did any peripheral for the Apple II actually use DMA though?

Many did. Any Z80 card using the original Microsoft softcard design or anything like it used DMA for access as there was no memory on the card. Many other replacement CPU cards did as well.

A few cards used for software piracy, er ...

In AppleII there is DMA access to RAM. It consists of stopping the 6502 clock. I have a question. For how long can you safely stop the 6502 clock in the LOW state in the MOS version?

Apple's recommendation is 10 uSec but it really depends on the actual CPU in use. The recommendation is based on ...

I made it to +-+-+ late last year.

Apple integer BASIC (and, I assume Apple 1 basic which it was derived from) allows this as well.

Out of curiosity, has anyone tried the TIM version on Hans' TIM (i.e. JOLT computer) simulator? Also, I'm not sure but I think the original assembler used might have been Aresco's version of the MOS resident assembler, https://www.pagetable.com/?p=1522

Maybe, just maybe, it would be workable if the machine drops to normal speed whenever it sees an access to a disk i/o address (I guess there are only a few of those) and then stays in normal speed for some extended period, maybe as much as the time it takes a disk to rotate. Twice. And of course ...

This Corvid thing is getting in the way of my hobbies!
Open here I flung the shutter, when, with many a flirt and flutter,
In there stepped a stately Raven of the saintly days of yore;
Not the least obeisance made he; not a minute stopped or stayed he;
But, with mien of lord or lady, perched ...

I remember I've read somewhere that in 1976 Allen Baum had written a tiny 300'ish byte assembler for the Apple-1. It supposedly uses a clever brute-force method, parasitising on the Baum-Wozniak disassembler (so that must be present as well, but that's just under 500 bytes).

However, after much ...

And also Multiplan, a pretty good spreadsheet program.

I have Apple Fortran but it isn't a 6502 compiler; It runs under Apple's Pascal environment and compiles to UCSD P-Code.

I've used these for about 2 years.

https://www.amazon.com/gp/product/B00FZPDG1K/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1

Hakko and I *THINK* they are made in the USA (I will have egg on my face if they are made in China!).


I've used these with pretty good results. I've also used Xuron ...

There was at least one other thing. Multiplan, Microsoft's competition to VisiCalc, ran on Apple ][.

For the clock, I use PHI0 inverted 3 times to add a slight delay.
Three times? Sounds fishy to me, although I'm not especially an expert on the iie and Mockingboard. But in 65xx jargon PHI0 (phi zero) is more or less the same as Phi2. Seems to me you might pass PHI0/PHI2 directly (ie, with zero ...