Search found 21 matches

by landex
Mon Jul 04, 2022 4:10 pm
Forum: Hardware
Topic: Timex 2048 only 16k
Replies: 49
Views: 10069

Re: Timex 2048 only 16k

But there is an another issue that I found: I used an normal Zx Spectrum power supply who has 15V output. After the TC2048 running about 4, 5 min the screen begins to flash the colours and changing colours. Then try it with another PU who has exactly 9V, and it works really fine. So, there must be ...
by landex
Mon Jul 04, 2022 12:10 am
Forum: Hardware
Topic: Timex 2048 only 16k
Replies: 49
Views: 10069

Re: Timex 2048 only 16k

I bought it, and it works very good! :lol: Do you mean that your TC2048 now has 48K of ram? YES!:) But there is an another issue that I found: I used an normal Zx Spectrum power supply who has 15V output. After the TC2048 running about 4, 5 min the screen begins to flash the colours and changing co...
by landex
Mon Jun 27, 2022 6:27 pm
Forum: Hardware
Topic: Timex 2048 only 16k
Replies: 49
Views: 10069

Re: Timex 2048 only 16k

landex wrote: Mon Jun 06, 2022 8:38 pm What about Z80SRAM - RAM / CPU module suitable for Sinclair ZX Spectrum 48k here.
Would it work on a TC2048?
I bought it, and it works very good! :lol:
by landex
Wed Jun 22, 2022 1:34 pm
Forum: Hardware
Topic: Timex 2048 only 16k
Replies: 49
Views: 10069

Re: Timex 2048 only 16k

I bought by mistake tesla MH84164 DIP16 for the 4264-12 dip18 dram. Then I realize I need dip19!! :cry:
Which can substitute the 4264-12 dip18 dram?
IC 4416 I see :D
by landex
Mon Jun 06, 2022 8:38 pm
Forum: Hardware
Topic: Timex 2048 only 16k
Replies: 49
Views: 10069

Re: Timex 2048 only 16k

What about Z80SRAM - RAM / CPU module suitable for Sinclair ZX Spectrum 48k here.
Would it work on a TC2048?
by landex
Fri Jun 03, 2022 7:00 pm
Forum: Hardware
Topic: Timex 2048 only 16k
Replies: 49
Views: 10069

Re: Timex 2048 only 16k

1024MAK wrote: Fri Jun 03, 2022 3:34 pm See also this post ;-)

Mark
I see! :D
by landex
Thu Jun 02, 2022 7:00 pm
Forum: Hardware
Topic: Timex 2048 only 16k
Replies: 49
Views: 10069

Re: Timex 2048 only 16k

Thanks mark and sP1d3r!

I am afraid to make something wrong, because my hands shake a bit. :(

I found in the www a schematic of TC2048 rev.5.1.3.

Image
by landex
Thu Jun 02, 2022 1:57 am
Forum: Hardware
Topic: Timex 2048 only 16k
Replies: 49
Views: 10069

Re: Timex 2048 only 16k

Mark, I can't find any TMS chip. Where is he?
But I found something that I think could be wrong: Above the U11 dram, the 3 resistors, the last one has another one above it.
by landex
Tue May 31, 2022 11:49 pm
Forum: Hardware
Topic: Timex 2048 only 16k
Replies: 49
Views: 10069

Re: Timex 2048 only 16k

Paul, I put the addresses 34000 and 35000.
85 and 255 are ok. 1 and 170 adds 1 value.
Then I repeat with 32768 to 32780, and the value 85 gets 85.

I must made a mistake before, maybe I wrote 80 instead of 85.
by landex
Tue May 31, 2022 11:02 pm
Forum: Hardware
Topic: Timex 2048 only 16k
Replies: 49
Views: 10069

Re: Timex 2048 only 16k

Hi Paul. I try it From 32760 to 32767 it's everything ok. But from 32768 to32780 it adds 1 value at 0, 85 and 170. The 255 it's in every memory fine. 32767 it's the last memory of the 16kb, isn't? Yes, 32768 is the first address after 16k. Did I get you right that the results were 1 for 0, 86 for 8...