Search found 238 matches

by 1024MAK
Thu Dec 13, 2018 4:57 am
Forum: Hardware
Topic: DIVMMC - where to get 128K ROM
Replies: 24
Views: 474

Re: DIVMMC - where to get 128K ROM

What worries me is that there might be some electrical difference... can I just drop a CMOS CPU into a socket formerly occupied by an NMOS version? Most ZX Spectrums will run okay with a 6 or 8MHz CMOS Z80. I don’t know if anyone has tried a 10MHz or a 20MHz rated CMOS Z80. The reason for the cavea...
by 1024MAK
Wed Dec 12, 2018 10:15 pm
Forum: Hardware
Topic: DIVMMC - where to get 128K ROM
Replies: 24
Views: 474

Re: DIVMMC - where to get 128K ROM

The CPU that is fitted, if an original part, will be a NMOS type rated at4MHz. NOTE there are versions by manufacturers other than Zilog. Zilog’s orginal part number for the 4MHz version was simply Z80A CPU. Any CMOS version should work. However, there is no advantage in buying one with a higher spe...
by 1024MAK
Mon Dec 10, 2018 10:26 pm
Forum: Hardware
Topic: DIVMMC - where to get 128K ROM
Replies: 24
Views: 474

Re: DIVMMC - where to get 128K ROM

The keyboard is actually the same as the ZX Spectrum+, which is an evolution of the rubber key using “technology” developed for the Sinclair QL. The layout was set before the PC keyboard became common in this country. If you look at the various keyboards on home machines available between 1979 and 1...
by 1024MAK
Sun Dec 09, 2018 5:09 pm
Forum: Programming
Topic: How to get started coding for ZX?
Replies: 9
Views: 359

Re: How to get started coding for ZX?

One document you should read through if you are using BASIC, is the 16k/48k manual. Here is an easy to read version.
As well as explaining BASIC, it also does cover the basics of the machines architecture, such as the reading of the keyboard, the screen, the memory map etc...

Mark
by 1024MAK
Sun Dec 09, 2018 4:59 pm
Forum: Hardware
Topic: DIVMMC - where to get 128K ROM
Replies: 24
Views: 474

Re: DIVMMC - where to get 128K ROM

To be fair, the 128k BASIC editor is rubbish. In some ways, I prefer the 16k/48k editor, minius the keyword entry system (assuming you are either using an Amstrad machine, a decent third party keyboard, or a emulator on a PC witch a decent keyboard).

Mark
by 1024MAK
Fri Dec 07, 2018 10:39 pm
Forum: Hardware
Topic: Return of the (slightly less) faulty ZX Spectrum
Replies: 3
Views: 148

Re: Return of the (slightly less) faulty ZX Spectrum

Yes, the coil is actually vibrating at the frequency generated by transistors TR4 and TR5. This is normal for coils in issue 1 and issue 2 machines. Sinclair used better made coils in later machines that make less noise and also revised the circuit design a number of times. But they still often make...
by 1024MAK
Fri Dec 07, 2018 9:48 am
Forum: Hardware
Topic: DIVMMC - where to get 128K ROM
Replies: 24
Views: 474

Re: DIVMMC - where to get 128K ROM

Velesoft has his own website and posts on the forums at World of Spectrum . The most likely place would be in the hardware sub-forum here . The WoS forums are not scanned by search engines, so will not show up any results in a search engine. The DIVMMC is an evolution of earlier DivIDE interfaces, w...
by 1024MAK
Wed Dec 05, 2018 11:19 pm
Forum: Sales/Commercial
Topic: Some ZX T-Shirt
Replies: 14
Views: 446

Re: Some ZX T-Shirt

The key legends on the original Spectrum are also set in Helvetica, by the way, not Arial. Keep that in mind. Aww c'mon—nitpicking. To the layperson, these fonts are all the same: http://stonechatproductions.co.uk/zxgames/gameimages/ZXFonts.png I don’t know. That last one looks a little off. Can’t ...
by 1024MAK
Wed Dec 05, 2018 11:23 am
Forum: Hardware
Topic: ATX power supply on ZX Spectrum
Replies: 6
Views: 135

Re: ATX power supply on ZX Spectrum

I see you have already removed some of the components from your board. For the benefit of others, I will still list the components that need removing. ZX Spectrum, Issue 3 board, suppling from an external regulated PSU Remove the following components from the ZX Spectrum PCB: REG - 7805 voltage regu...