Re: Transwarp IIe revisited

[mdj <mdj.mdj@gmail.com>]

On Dec 8, 11:50 pm, Linards Ticmanis <ticma...@gmx.de> wrote:
> David Wilson wrote:
> > On Dec 8, 7:51 pm, mdj <mdj....@gmail.com> wrote:
> >> FWIW, my card has 80ns RAM on it. I imagine someone has swapped the
> >> RAM at some earlier point, 150 is way to slow
>
> > I just took a look at mine and it has 8x HM50256-15 NMOS DRAM chips
> > (week 50 of 1985).
>
> Hmmm... I have HM50256P-15 from WK13/86. Then speed is maybe not the
> issue after all.

Unless one or more of them is faulty...

I didn't do the math, but I would have thought 150ns was marginal at
3.6Mhz considering the Apple II refresh scheme.

> > I have not used it in a while but I never noticed any problems.
> > The PALs are a mixture of A & B revs: TW[15]A-Q and TW[234]B-Q.
>
> Exactly the same here.

PALs on mine are the same too

Matt