Search found 226 matches

by gammaray
Fri Oct 20, 2017 9:27 pm
Forum: Welcome Area
Topic: My 1000 is on its way OHIO
Replies: 12
Views: 252

Re: My 1000 is on its way OHIO

On the shoulders of others! Glad it helped there are others too on sellmyretro.com
by gammaray
Thu Oct 19, 2017 6:54 pm
Forum: Hardware
Topic: ADDRESSING RAM AT 16K+
Replies: 11
Views: 161

Re: ADDRESSING RAM AT 16K+

No wonder my chip-select / write enable didnt work!
by gammaray
Wed Oct 18, 2017 7:27 pm
Forum: Sinclair Misc
Topic: Get a LIFE?
Replies: 6
Views: 128

Re: Get a LIFE?

Good to know I was scanning dates!
by gammaray
Wed Oct 18, 2017 5:51 pm
Forum: Hardware
Topic: ADDRESSING RAM AT 16K+
Replies: 11
Views: 161

Re: ADDRESSING RAM AT 16K+

If this schematic is accurate, there is ROMCS and A14 on ULA. So how does the ULA react when A14 is high with regards to ROMCS (assuming CPU has MEMRQ active... I am expecting that ROMCS is an output and A14 is an "input" to ULA "asking ULA" to enable ROM. Forcing RAMCS by external rampack does make...
by gammaray
Wed Oct 18, 2017 2:26 am
Forum: Hardware
Topic: ADDRESSING RAM AT 16K+
Replies: 11
Views: 161

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: 12
Views: 252

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: 6
Views: 128

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: 17
Views: 238

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: 17
Views: 238

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: 290

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...