Search found 2539 matches

by 1024MAK
Mon Nov 04, 2019 12:03 am
Forum: Sinclair Misc
Topic: Quicksilva article
Replies: 1
Views: 149

Re: Quicksilver article

Thanks (I think) Greg

A fair amount of reading there, something to read on a rainy November day... :lol:

Mark
by 1024MAK
Sun Nov 03, 2019 11:46 pm
Forum: Welcome Area
Topic: Hi from Durham
Replies: 6
Views: 312

Re: Hi from Durham

Hello and welcome to our forum Andy!

:D :D :D

I hope you enjoy the forum :D

We are happy to help if you have any questions.

Mark

PS what are the other 20 machines?
by 1024MAK
Sun Nov 03, 2019 10:41 am
Forum: SALES
Topic: Bits and bobs (Jupiter ACE)
Replies: 5
Views: 358

Re: Bits and bobs (Jupiter ACE)

Hi Claudius

I would like:
  • 96K RAMpack + AY DIY kit inclining nearly all parts except 628126 IC and the edge connector - 1 set for 12.50GBP
  • Video output buffer PCB - 1 unit for 3.00GBP
I’ll send you a PM...

Mark
by 1024MAK
Fri Nov 01, 2019 7:29 pm
Forum: Welcome Area
Topic: Hello from Denmark.
Replies: 1
Views: 331

Re: Hello from Denmark.

Hello and welcome to our forum Brian!

:D :D :D

I hope you enjoy the forum :D

We are happy to help if you have any questions.

Mark
by 1024MAK
Fri Nov 01, 2019 7:25 pm
Forum: Welcome Area
Topic: Hello from Germany
Replies: 4
Views: 588

Re: Hello from Germany

Hello and welcome to our forum Karsten!

:D :D :D

I hope your sale goes well :D

We are happy to help if you have any questions.

Mark
by 1024MAK
Fri Nov 01, 2019 6:52 pm
Forum: Hardware
Topic: RAMPACK and Hi-RES mod ?
Replies: 19
Views: 799

Re: RAMPACK and Hi-RES mod ?

Yeah, that will work.

Mark
by 1024MAK
Fri Nov 01, 2019 1:34 pm
Forum: Hardware
Topic: RAMPACK and Hi-RES mod ?
Replies: 19
Views: 799

Re: RAMPACK and Hi-RES mod ?

Yeah, it would not surprise me if 1N4148 diodes worked.

Anyway, my diagram for a 7400 / 74LS00 is similar, but I allocated the gates with the use of stripboard in mind:
Hi-Res mod to a 16K RAM pack using a 7400
Hi-Res mod to a 16K RAM pack using a 7400
Mark
by 1024MAK
Thu Oct 31, 2019 7:52 pm
Forum: Hardware
Topic: RAMPACK and Hi-RES mod ?
Replies: 19
Views: 799

Re: RAMPACK and Hi-RES mod ?

As well as a 74LS08 (or equivalent), it’s also possible to use the more common 74LS00 (or equivalent), you just have to use two logic gates instead of one. I’ll post a schematic later.

Mark
by 1024MAK
Thu Oct 31, 2019 9:29 am
Forum: Hardware
Topic: RAMPACK and Hi-RES mod ?
Replies: 19
Views: 799

Re: RAMPACK and Hi-RES mod ?

In order for any external RAM (SRAM or DRAM) to be hi-res capable, it has to respond to either the Z80 CPU performing a normal read (Z80 control line ‘/RD’ going low) or the Z80 refresh control line (‘/RFSH’) going low. 1N34A diodes are hard to get hold of these days, and if you do find some, they a...
by 1024MAK
Thu Oct 31, 2019 9:04 am
Forum: Lambda 8300/ Power 3000 Lounge
Topic: L8300/P3000 Monitor output..?
Replies: 6
Views: 788

Re: L8300/P3000 Monitor output..?

Hello and welcome. You may want to introduce yourself in the welcome area here . A monitor output is indeed a composite video output. It is possible that Lambda does not produce the part of the video signal that is known as ‘the back porch’. The purpose of this part of the video signal is to tell th...