Search found 123 matches
- Sat May 29, 2021 3:47 pm
- Forum: Z88
- Topic: 512K SRAM internal upgrade
- Replies: 1
- Views: 3053
512K SRAM internal upgrade
Hi all, I thought it would be useful to post here that I successfully carried out a 512K SRAM internal upgrade, and that it definitely works with the Alliance AS6C4008-55PCN part. This is pretty much the only remaining 512K SRAM in a PDIP-32 package that is still sold new, without resorting to recyc...
- Fri Apr 30, 2021 1:37 am
- Forum: Emulators
- Topic: Zeddy emulator for ZX Spectrum
- Replies: 20
- Views: 26453
Re: Zeddy emulator for ZX Spectrum
Is there a way to get Paul's emulators working on a DivMMC/DivIDE since they can shadow the ROM into RAM can't they?
- Mon Apr 26, 2021 11:19 pm
- Forum: GAMES
- Topic: There's one game I keep coming back to
- Replies: 1
- Views: 3456
There's one game I keep coming back to
zx81-lapulga.png La Pulga - a simple concept perfectly executed. The design genius of using the time the key is held gives it a sort of analogue control precision. You play to perfect your technique because you can tell you get better with each play stint. It's an infuriating challenge that's as ju...
- Mon Apr 26, 2021 7:37 pm
- Forum: Hardware
- Topic: Diagnosing tape loading issues
- Replies: 49
- Views: 12725
Re: Diagnosing tape loading issues
If I buy a donor machine, can I use an older ULA in a system that originally had the newer one with back porch?
- Wed Apr 21, 2021 3:06 pm
- Forum: Hardware
- Topic: Salvaging original keyboards
- Replies: 17
- Views: 3997
Re: Salvaging original keyboards
Not long until people will be emulating a PS4 on a solar powered computer that fits inside a contact lens. Seems ridiculous now, but it's a logical progression.
- Wed Apr 21, 2021 2:25 pm
- Forum: Hardware
- Topic: Salvaging original keyboards
- Replies: 17
- Views: 3997
Re: Salvaging original keyboards
I got the 2019-made Pure Retro ones on eBay, since the regular 2014 design from RWAP was sold out with no ETA for restock.
- Tue Apr 20, 2021 11:04 pm
- Forum: Hardware
- Topic: Salvaging original keyboards
- Replies: 17
- Views: 3997
Re: Salvaging original keyboards
I trimmed the keyboard membrane tails on the surviving original keyboard I have and got it working. It is noticeably a lot more responsive than the reproduction. As in you only need a fraction of the pressure to trigger a keypress. I'd go as far as to say that most games are utterly unplayable on th...
- Sun Apr 18, 2021 6:43 pm
- Forum: Hardware
- Topic: Diagnosing tape loading issues
- Replies: 49
- Views: 12725
Re: Diagnosing tape loading issues
I tried changing R34 from 220R to 470R and this also had no impact. So I guess it's ULA trouble.
- Fri Apr 16, 2021 2:36 pm
- Forum: Hardware
- Topic: Composite mod issue: left side of screen missing - solved!
- Replies: 64
- Views: 16275
Re: Composite mod issue: left side of screen missing - solved!
The trimmer seems to have drifted now so all black pixels have ghosting, meaning I'll have to open the Zeddy up yet again.
I have decided out of curiosity to order a new composite mod from ZX Renew (£11) and give that a go, seeing as I was ordering an S-Video mod for Spectrum 48K.
I have decided out of curiosity to order a new composite mod from ZX Renew (£11) and give that a go, seeing as I was ordering an S-Video mod for Spectrum 48K.
- Wed Apr 14, 2021 11:13 am
- Forum: Hardware
- Topic: Composite mod issue: left side of screen missing - solved!
- Replies: 64
- Views: 16275
Re: Composite mod issue: left side of screen missing - solved!
Thanks for taking the time to write that out, very detailed. One other observation I've noticed is that the remaining 10K trimmer seems to drift with temperature, or perhaps it's the ULA drifting as it warms up. The trimmer we removed seemed to set the duration of the back porch in the h-sync pulse....