Search found 222 matches

by gammaray
Wed Oct 18, 2017 2:26 am
Forum: Hardware
Topic: ADDRESSING RAM AT 16K+
Replies: 4
Views: 55

ADDRESSING RAM AT 16K+

Ok I have been looking at the schematic for Zeddy and previous posts and cannot figure out how ANY of memory internal 1k,2k or external is addressed starting at 16K boundary. Wouldn't A14 have to be high and ULA decide to put out a RAMCS signal to read the ghost for the RAM? Conversely would A14 bei...
by gammaray
Tue Oct 17, 2017 9:27 pm
Forum: Welcome Area
Topic: My 1000 is on its way OHIO
Replies: 8
Views: 187

Re: My 1000 is on its way OHIO

Can you make a proper video circuit?

viewtopic.php?f=7&t=2405&p=25270&hilit= ... deo#p25270
by gammaray
Tue Oct 17, 2017 9:09 pm
Forum: Sinclair Misc
Topic: Get a LIFE?
Replies: 2
Views: 46

Get a LIFE?

I am beginning to think that I don't have a life...OR...my life is Sinclair, I pull up this website at work everyday.
by gammaray
Mon Oct 16, 2017 8:26 pm
Forum: ZX BASIC
Topic: Loading/Editing/Saving .p files..?
Replies: 16
Views: 197

Re: Loading/Editing/Saving .p files..?

Everything else but that one...maybe cuz I am in the U.S? Selective copyright protection?
by gammaray
Mon Oct 16, 2017 8:16 pm
Forum: ZX BASIC
Topic: Loading/Editing/Saving .p files..?
Replies: 16
Views: 197

Re: Loading/Editing/Saving .p files..?

Does anybody have the "DskCenter_DLL.zip" for ZXTOOLS which seems to be unavailable?
by gammaray
Sun Oct 15, 2017 9:23 pm
Forum: Sinclair Misc
Topic: MEMOTECH
Replies: 15
Views: 256

Re: MEMOTECH

In order to give the thread a different direction : Memotech expansions were great when they were first offered but nowadays make little sense to recreate. Rampack with dynamic ram should better be static ram today. And with ZXPand and zxblast these are available. Hrg module are not necessary any m...
by gammaray
Sat Oct 14, 2017 9:16 pm
Forum: Sinclair Misc
Topic: MEMOTECH
Replies: 15
Views: 256

Re: MEMOTECH

I inquired about it. The clock is ticking, waiting for response...
by gammaray
Fri Oct 13, 2017 9:26 pm
Forum: Hardware
Topic: What is the going price to have EPROMs burnt?
Replies: 14
Views: 182

Re: What is the going price to have EPROMs burnt?

Depends on humidity. If always been low, it should fire up.

(The mother or daughter board circuits can oxidize with moisture which is why the clothes dryer in garage should be vented outdoors)
by gammaray
Fri Oct 13, 2017 9:05 pm
Forum: Hardware
Topic: What is the going price to have EPROMs burnt?
Replies: 14
Views: 182

Re: What is the going price to have EPROMs burnt?

Am I mistaken or does this help?

http://www.danbbs.dk/~rmadrm/eprom9.htm

If it does, I have some 8255's I need burned for SDK-85
;)
by gammaray
Thu Oct 12, 2017 2:58 pm
Forum: Hardware
Topic: Memotech Memopak 32k
Replies: 11
Views: 260

Re: Memotech Memopak 32k

From our forum a link to http://www.zx81.de/memotech/memory64.txt

explains 64K function, the 4 dipswitch setting seem to be for setting 8-16K