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I am currently refactoring the memory usage (again) to enable the gameplay code + data to reside in two separate RAM banks, this is necessary because of the size and way that the screen buffers are hanlded on the BBC machine. I will provide you with a list of newly implemented features, bug fixes and known issues so you have a better idea of what to expect.

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Would you be willing to keep testing future builds for me please? If so, I will be more structured in my approach rather than just sling a random update onto the forum. (I know at this point some of the bugs / missing features are not 'little'. As you can probably tell, as much as I enjoyed PoP as a kid (on PC), I am not an expert so a lot of the little details would be easy for me to miss. I want to say thank you again for your help playtesting the game. No doubt, as I've tried to leave the Apple II code untouched as much as possible (just moving the memory around and writing custom BBC screen handling routines.) I will read the thread and implement the proposed fix. I see your port also contains this bug from the Apple II version: viewtopic.php?p=12150#p12150 I will look at perhaps doing several different keyboard mappings if there are some established configurations on other platforms.Дavid wrote: в†‘ November 19th, 2017, 1:07 pm The BBC can cope with multiple keys pressed down simultaneously but I need to recode the PoP keyboard input to enable this.

The keys are actually BBC keyboard 'standard' game mapping: Z X : / Return with ] added for up left/right. Thanks for trying it out! You can use a PC/Mac/Linux emulator like BeebEm or b-em and download the disk image (.ssd) for it instead. Or, if the BBC Master can't deal with 2 keys pressed down at the same time (e.g. It would be nice if playing was possible with arrow keys, combined with Shift (as DOS) or/and 'x' (as SNES).

It's too bad that that emulator stops when switching away from its tab.Д«ecause it means players are forced to wait for all the disk drive 'nonsense'. Norbert wrote: в†‘ October 14th, 2017, 7:29 pm If anyone here is deeply familiar with the Apple II 6502 source, as I am becoming, I will no doubt be interested to ask you some questions when it comes to some of the gnarlier corners of the code. But it is certainly playable!ДЄll code is posted on my GitHub repo here: and should be easily built by anyone else using the BeebAsm assembler. Your keyboard mapping may vary!)ДЄs I said, there is still plenty of work still to do including porting the rest of the gameplay functions (it will crash if you trigger an unimplemented gameplay feature), the cutscenes & attract mode, music & sound effects, updated graphics designed for the BBC Micro screen resolution & colours and likely a whole load more optimisation to remove the flicker & graphical glitches.

(The keys are: z left x right ' up / down up-left # up-right Enter action. You can try out the latest playable build using the online BBC Micro emulator (known as jsbeeb) here. I've been keeping a development blog, of sorts, on the Acorn / BBC Micro enthusiasts forum Stardot, which you can read here. For similar reasons, I thought there might be people interested in this project here. The game is certainly not complete yet but I have got far enough to share with the folks in the Acorn / BBC Micro enthusiasts scene.

This was the first of many challenges but I have made considerable progress so far. Unfortunately this RAM is not in two simple 64K memory banks but distributed across the memory map in a somewhat inconvenient manner. Given the RAM requirements, I decided to limit my port to the BBC Master model which comes with 128K RAM as standard. Thankfully Jordan Mechner was a surprisingly forward-thinking & careful programmer back in the late 80's and, whilst there was a lot of code, it was well structured with jump table interfaces for every module and a clean separation between gameplay logic and rendering. As the BBC Micro uses the same 6502 CPU as the Apple II, the code was very familiar even if the hardware internals and memory mapping of the Apple II were not. After discovering the Apple II source had been released on GitHub, I decided to take a look.

BBC MODEL B EMULATOR FOR MAC PC

I've always loved Prince of Persia, having played the original PC version back in the day as a teenager.

BBC MODEL B EMULATOR FOR MAC SOFTWARE

Many coders taught themselves to program on this machine and have gone on to have careers in software development (including myself!)

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For those of you outside of the UK, the BBC Micro computer series was created by Acorn in the early 1980's and was a familiar sight in all British schools of the era. For the last six months or so I have been porting the original Apple II 6502 source & sprites to the BBC Master computer. I thought I would join your lovely forum and introduce myself.

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