cashe — ZXNet «real.speccy»

From Roman Milukov To All 23 February 1999

Hello, Alexander!

19 Feb 99 you wrote here:

AK> if the cache is 32K, then use
bit5
AK> #EFF7 as the most significant bit of the address (ml/st 16K).

Explain why you chose this particular port and this particular bit.

And why “as the highest address”? Maybe it’s better to use it as a
permission to use bit 4 #7FFD as the high address?

After all, some may use a 32K microdrive as a cache, but there is no port
#EFF7 and they are too lazy to do so. It will be enough for him to set the high
address to bit 4 #7FFD through a toggle switch and it will be 32K if turned on.

All the best.
Sincerely Roman.

From Eudgine Palenock To All 26 February 1999

Hello, Roman!

Once, 23 Feb 99 at 12:11:44, someone Roman Milukov wrote to Alexander Kormishin,
on the topic 'cash'...

RM> After all, some people can use a 32K microchip as a cache,

Are there similar m/s at 64K? After all, then it will be possible to
emulate all ROMs...

With respect, Evgeniy aka EVP.

From Tim Kelly To All 28 February 1999

AK> use
bit5
AK>> #EFF7.
==============================================================================

Namely, why does the quota break? Is the line longer than the standard?
I saw such a glitch from writers on the internet, it’s because of the software settings.

[Team Kelly]
Hasta la vista.
Tim Kelly

... PGP Key Fingerprint = D4 CA 92 C2 EE 54 21 E1 01 E1 3E 2B 34 BF BC FC

From Roman Milukov To All 1 March 1999

EP> Are there similar m/s at 64k? After all, then it will be possible to emulate all ROM
EP>...

Yes, both 64K and 128K exist.
Only they have 32 legs. And sometimes in a narrow body. :( It’s better to solder another 62256
on top. And they cost much more.
Why do you need to emulate the ENTIRE ROM? Well, one or two pages is enough, the rest is
standard ROM.
Although if you emulate the entire ROM, you can throw out 27512 altogether. Put 2764,
which will be when you turn on the computer calculate the checksum of 62512, and
reboot it from the disk, if there is something there.
And testing the computer can be shoved into this ROM.

From Ivan Mak To All 1 March 1999

62512 - 64k
621000 - 128k

Wow! The Protoss are attacking my Zerlings! It's time to get going. Ivan.

- Break up the scheme, big and small..

... E-mail: ivan...@neva.spb.ru