Spectrum Computing

The problem is that this changes the size of the frame buffer. THAT necessitates moving things around in memory, since the size of the frame buffer is a well-known, fixed varlable. While it's theoretically possible to do something like this, it would not work with most existing software. The only th...

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...

For reference, the CPU is a Z0840004PSC. That is an NMOS CPU, according the documentation I've found so far. Data sheet here: https://www.datasheets360.com/part/detail/z0840004psc/2029254340876896220/ I ordered a Z84C0010PEG‎ from DigiKey: https://www.digikey.com/products/en?keywords=Z84C0010PEG%E2%...

That would be loading a TAP file on the PC and hooking my sound card up to the tape input, right? The purpose of the DivMMC is so I don't have to do that. Sure, I understand that. But what’s the point of having a Spectrum , and why would you shelve it if it didn’t play ball with the DivMMC? I mean,...

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 sp...

This brings me to the next question. Looking online, I found a Z80 CPU at DigiKey: https://www.digikey.com/products/en/integrated-circuits-ics/embedded-microprocessors/694?k=zilog+z80&k=&pkeyword=zilog+z80&sv=0&pv16=12121&sf=0&FV=ffe002b6%2Cffec7cc7%2C7e801b1%2C1f140000&q...

You can still transfer programs the old-fashioned way. That would be loading a TAP file on the PC and hooking my sound card up to the tape input, right? The purpose of the DivMMC is so I don't have to do that. Re the M1 line: It might be the problem, but why would the machine work fine for twenty m...

Tim at TFW8B suggested that the Z80's M1 line may be faulty, which can prevent it from working with the DIVMMC, even though the system works fine otherwise, without a cartridge. I'm kind of stuck, since I don't have another Spectrum to test with, and I can't find another compatible computer for sale...

So after everything, I finally got my DivMMC and my video cable last night. I got everything up and running, and the DivMMC worked for about 20 minutes. Now the screen just shows garbage, and I can't get the computer to successfully start up with a card in the slot. I've run through all the likely t...

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). To tell you the truth, after using the 128K for ...

Since I can't use a single, 32K ROM in FUSE (it only accepts 16K ROM files), I'll just wait until the DIVMMC gets here to try it. You could use a file splitter (e.g., HJ-Split) to split the ROM in two halves. I was actually considering that; I just realized as I was messing with this that there's r...

And here we go... https://www.worldofspectrum.org/forums/discussion/42818/ Velesoft explained the problem, and it makes perfect sense. The DivIDE (and presumably DivMMC) uses some of the same memory in RAM that the 128K BASIC editor uses. So when you try to execute any commands in 128K BASIC, the sy...

Thanks. I didn't even know there were forums at WoS. I've been using that site to read documentation and download emulation products. (I really love Paul Dunn's IDE - I wish he'd continue to develop that.)

Thanks. I looked at that, but there are no real instructions there - just a short YouTube video that shows someone opening the NMI screen from 128 BASIC. I can't even get that far on FUSE, but I suppose I should probably wait until I get the actual DIVMMC before I play with this any more.

I ordered a DIVMMC to go with the 128K Spectrum I just bought, and I just discovered that 128 BASIC isn't fully compatible with the DIVMMC. Wouldn't you know it, the entire reason I bought the DIVMMC was to trade BASIC programs with the PC. When I try to use 128K BASIC on FUSE with the DIVMMC enable...

Hello! Is there any "Media/Admin" type software like the "TR-DOS Navigator" for a ZX Microdrive outfit? The only one that I could find was the MaxDesktop software (which tried to show the then brand-new WIMP environment). I must admit that a 2-window-style DOpus (Amiga)/Norton C...

Thanks for your input, so far. That really helps. Right now, I'm playing with BASIC, and I'm writing a small space trading program. I'm hoping to release it for Commodore, Spectrum, and CP/M all at the same time, using a single code base and a custom tokenizer/IDE I'm working on. In the long run, I'...

Hi, all. I recently picked up a Recreated, as well as a Spectrum 128 (which is still in the mail), and I wanted to explore progamming options above & beyond BASIC. I like the Z80 for assembly programming, much more than the 6502, but I'm finding that Spectrum BASIC is slooow. I was hoping to fin...

I'm interested to see how this goes. I've got a Recreated, as well, and I ended up shelving it because it's faster and easier to just use a PC keyboard. In fact, I ended up ordering a Spectrum 128 +2 precisely because it has a typewriter keyboard, rather than the rubber chicklet keyboard on the Recr...