Phil_G

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  • in reply to: Roll call :-) #1200
    Phil_G
    Moderator

    Again, its been a while… anyone with an update? CPM3? Teletext? I2C?
    Cheers all, stay safe
    Phil
    PS still nothing from John…

    in reply to: Roll call :-) #1111
    Phil_G
    Moderator

    Hi all, good news, I did manage to contact John and he said he’d be back shortly.
    He’s fine, but has weathered a range of problems which we ought not to query but all being well the Playground will be back on track. He did mention that more Playgrounds should be available very soon and that he wanted to do a project update video. To all those waiting for a board – hang in there!
    Cheers
    Phil

    in reply to: Roll call :-) #1109
    Phil_G
    Moderator

    All sorted, I had only just updated philg.uk and I think maybe the changes hadn’t yet propagated over to Spain! Rick now has his files. Cheers
    Phil

    in reply to: Roll call :-) #1107
    Phil_G
    Moderator

    Hi Rick, the gerbers are on http://philg.uk or I can send you one if you like, thats assuming you’re in the UK, otherwise probably cheaper to have them made yourself. Just submit the zip file intact to JLCPCB.

    Steve, your CP/M 3 implementation sounds really good, you must have put a fair bit of work into that. Is it still FAT?, (I’m assuming not)

    Cheers all
    Phil

    in reply to: Roll call :-) #1104
    Phil_G
    Moderator

    Hi Kevin, good to hear from you. I’ve also been struggling after a bike accident, we dont mend as easily as when we were younger!
    John hasn’t replied to my last few emails but I only have an 8bitstack address, I dont have his ‘everyday’ email.
    Are there still sites you can dial up by modem? I did get a centronics printer working on the 8255 I/O board, basically just check for busy, output a character & pulse the strobe. You do need a spare though, one for working on. Its an easy build, half an hour max, and with modern PCBs you just dont get shorts & dry joints, it all works first time!
    If you’re wanting to get on with a Z80 project, theres always Grant Searle boards, or the RC2014, both very similar to the Playground.
    As far as I know though, the Playground is the only FAT implementation, which seals it for me!
    Cheers
    Phil

    in reply to: Roll call :-) #1096
    Phil_G
    Moderator

    That sound interesting John, I remember way back when one of our South Yorkshire ACC club members Lindsey Reid(?) built a huge teletext system entirely in TTL, I think it took 3 or 4 amps!

    Good to hear that theres still some interest, anyone else please jump in with a ‘me too’. Nothing heard from John (the boss) since my email last week, but the only email I have for him is tied to 8bitstack.co.uk so maybe he’s taking a break from the whole thing. I took the liberty of dropping John an idea or two for keeping the Playground going, I do hope we see him back soon.

    I’ve been laid up after a motorbike accident but propped up in bed I built a couple of Grant Searle “Simple Z80” boards to pass the time. As published its a BASIC-only computer but I found that the 8k BASIC is actually only 7.5k in an 8k ROM, so I used the Playground to develop a small 500-byte m/c monitor for it: https://www.youtube.com/watch?v=mvZ_L-rdgBQ

    Also did a version 2 of Karen Orton’s NIBL computer, all SC/MP m/c:
    https://www.youtube.com/watch?v=d4PSkEpVwAE

    Not done anything at all with the Cosmac Elf – too many projects!

    Whats everyone else been up to?

    Cheers
    Phil

    • This reply was modified 5 months, 2 weeks ago by Phil_G.
    • This reply was modified 5 months, 2 weeks ago by Phil_G.
    in reply to: Awaiting new supply availability #1073
    Phil_G
    Moderator

    Hi Ted, looks like John is still under the weather…
    I have a spare Playground that you could borrow, I would definitely need it back but I dont mind loaning it for a short while. UK postage will probably be £4 ish each way, if you’re interested email me on philg@talk21.com with your full postal address. To be clear this is Johns project, other than the I/O board I’m not involved in the Playground at all, I’m just a happy user trying to help you & John out whilst he’s ill.
    Cheers
    Phil

    in reply to: Anyone heard from John? #1063
    Phil_G
    Moderator

    Hi John, sorry to hear that, but relieved to hear from you – we were quite concerned. Take your time to recover properly, this is only a hobby 🙂
    Email me if theres anything specific I can help with
    Cheers
    Phil

    in reply to: Anyone heard from John? #1060
    Phil_G
    Moderator

    Hi Kevin
    Due to a covid overlap we isolated for 15 days, all ok now 🙂
    I’m still concerned, John would normally at least acknowledge emails.

    in reply to: Awaiting new supply availability #1054
    Phil_G
    Moderator

    Hi Teddy, its John you need, I’m just a punter like yourself. John supplies MBASIC and BBCBASIC which are both good, solid and standard interpreters.
    WordStar is there too, preconfigured for the Playground and works perfectly.
    Turbo Pascal, Hitchhikers Guide, Sargon chess etc, lots of stuff is included.
    I’ve not found anything that doesnt run under John’s CP/M other than obvious no-no’s like disk sector editors etc (its FAT so doesnt directly relate to CP/M sectors). Hopefully John will be along soon to sort you out.
    Cheers
    Phil

    in reply to: Playing with a simple 8-bit output port #1052
    Phil_G
    Moderator

    Mines switchable 4 or 10mhz, but its almost always on 4mhz as a lot of my old CP/M stuff assumes a 4mhz Z80 when loop-timings are used (eg the DAC stuff)
    A couple or 3 years ago I started using EEPROMs exclusively, I find them so much more convenient than EPROMs for development. Even my old Kitbug SC/MP board has a 2k byte 28C16 🙂 And for my 6800 project I bought a 48Z35 battery-backed 32k x8 sram, half of which is write-protected with the monitor & microbasic and half read-write for ram, one chip does both jobs.
    The problem is with the current silicon shortage, electronics is becoming an expensive hobby!
    Cheers
    Phil

    in reply to: Awaiting new supply availability #1050
    Phil_G
    Moderator

    Hi Teddy, its worth waiting for, I much prefer the Playground over other current Z80 CP/M projects, the FAT bdos is so convenient.
    John hasnt been on here for a few days, I expect he’ll be back soon.
    Roughly where are you?
    Cheers
    Phil

    in reply to: Playing with a simple 8-bit output port #1049
    Phil_G
    Moderator

    All good stuff David, you can run Richard Russell’s Music Compiler with just one output port 🙂
    A port opens all sorts of opportunities:-)
    Did you change the cpu crystal? to what speed? I much prefer 4mhz as the old loop-timed stuff runs perfectly, I think music has a max of 6mhz iirc.
    Cheers
    Phil

    in reply to: Playing with a DAC #1045
    Phil_G
    Moderator

    I do a bit of guitar Glyn but I’m far from musical 🙂 I was never a game fan, I dont have the reactions! But I’m always interested in microprocessor applications, and when I needed an I/O board I did think about the AY-3-8910 as I have a couple in my stash. Three channel sound plus two 8-bit ports. This led me to a chiptunes program for the RC2014 and an idea that one day I’ll have a go!

    in reply to: Quiet here, innit? #1018
    Phil_G
    Moderator

    >>I’ve been playing with using your PIO board to interface
    >>to a 4×20 alphanumeric display.

    Looks like the forum is being weird about photos again, I had to right-click, open in a new tab to see your pic 🙂
    That looks good John crisp & clear display – you most likely know that the 8 data lines can be 4? you still need RS and E so 7 lines including ground. 8 if you need to read the display (I always ground R/W) 🙂 Nice!

    Rob – I never did any 6502, never had a 6502 machine so thats an area I missed out on completely… IIRC John (Playground John) was doing a 6502 in TTL !!!

    Phil

Viewing 15 posts - 1 through 15 (of 158 total)