Search found 13 matches

by BrettRogersUK
Tue Jul 21, 2020 11:54 pm
Forum: introduce yourself
Topic: Hello Everyone!
Replies: 7
Views: 257

Hello Everyone!

Hi Everyone, Hope you're all well. I thought I'd introduce myself. My name is Brett and I'm originally from Nottingham but now live in Bradford with my wife and my cat, Phoebe. Through the years I have had various computer starting when I was young with the ZX spectrum. From this we got the Acorn El...
by BrettRogersUK
Sun Jul 19, 2020 9:33 pm
Forum: 8-bit acorn hardware
Topic: Eprom programming with BEEB
Replies: 13
Views: 549

Re: Eprom programming with BEEB

Hi Everyone,

Here's a PCB I've made from the original design in the Beebug Magazine (August/September 1985).

Front:
2020-07-19 (2).png
Back:
2020-07-19 (3).png
Kindest Regards,

Brett
by BrettRogersUK
Sat Jul 18, 2020 9:49 pm
Forum: 8-bit acorn hardware
Topic: Eprom programming with BEEB
Replies: 13
Views: 549

Re: Eprom programming with BEEB

Pin 1 on the printer port, the strobe (STB) is the CA2 pin. Do keep in mind that on the BBC B PCB there is a link option S1 to determine if it is buffered by a logic gate and a transistor (the normal setting) or goes direct to the pin of the 6522 VIA chip. Mark Thanks Mark. Will take this under adv...
by BrettRogersUK
Sat Jul 18, 2020 6:57 pm
Forum: 8-bit acorn hardware
Topic: Eprom programming with BEEB
Replies: 13
Views: 549

Re: Eprom programming with BEEB

@ Chris - True, but if you were not aware of the existence of EEPROMs, you may think that the only type of non-volatile memory chip you can use in the sideways ROM sockets of a Beeb is EPROMs. Some types of EEPROMs can be programmed in a Beeb with a minor wiring change. Brett now has the option of ...
by BrettRogersUK
Sat Jul 18, 2020 6:38 pm
Forum: 8-bit acorn hardware
Topic: Eprom programming with BEEB
Replies: 13
Views: 549

Re: Eprom programming with BEEB

Hi Everyone, The Programmer I'm building uses both the User port and Printer port. The article mentions connection CA2 on the printer port which connects to the program pin on the ZIF socket (Eprom). Can anyone tell me what pin number that is on the port itself on the beeb? I've looked here http://c...
by BrettRogersUK
Sat Jul 18, 2020 5:34 pm
Forum: 8-bit acorn hardware
Topic: Eprom programming with BEEB
Replies: 13
Views: 549

Re: Eprom programming with BEEB

For the BBC B, the standard ROM is either a 64K bit (8K bytes) EPROM such as a 2764. But these have been obsolete for many years. Or you can also use a 128K bit (16K bytes) EPROM such as a 27128 or 27C128. Alas these are also now obsolete. You may be able to find some on internet trading sites, or ...
by BrettRogersUK
Sat Jul 18, 2020 12:08 pm
Forum: 8-bit acorn hardware
Topic: Eprom programming with BEEB
Replies: 13
Views: 549

Re: Eprom programming with BEEB

Hi All,

Thanks for the replies. Very helpful indeed.

Will definitely give it a go. Nothing to lose really except a few duff eproms.

Kindest Regards,

Brett
by BrettRogersUK
Sat Jul 18, 2020 2:36 am
Forum: 8-bit acorn hardware
Topic: Eprom programming with BEEB
Replies: 13
Views: 549

Eprom programming with BEEB

Hi Everyone, I'm thinking of dabbling with 'blowing' eproms. I'm toying with the idea of building my eprom programmer as seen in Beebug 1985 issue 4 (I believe). Could anyone tell me what I need to be looking for chip wise to 'blow'? I've never done it before but its something I've always wanted to ...
by BrettRogersUK
Tue Jul 14, 2020 12:53 am
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1186
Views: 81909

Re: RGB to HDMI using a Pi Zero and a small CPLD

Question 1. I would like to ask which version of the board gerbers from the github would I need to use? Is it the ones in the KiCad_6bit folder and the V3_Standard folder? Yes V3 Standard is the latest and is linked from the wiki BOM page: https://github.com/hoglet67/RGBtoHDMI/wiki/Bill-of-Material...
by BrettRogersUK
Tue Jul 14, 2020 12:49 am
Forum: 8-bit acorn hardware
Topic: Acorn Electron Capacitors
Replies: 2
Views: 170

Re: Acorn Electron Capacitors

Thanks Mark!

Will report back when I have plugged it in.

Regards,

Brett
by BrettRogersUK
Mon Jul 13, 2020 5:23 pm
Forum: 8-bit acorn hardware
Topic: Acorn Electron Capacitors
Replies: 2
Views: 170

Acorn Electron Capacitors

Hi, I've got an Acorn Electron that hasn't been powered up for years. I know there are capacitor replacement kits available for other computers including the good ol' Beeb. I know it runs off a wal-wart but is there any caps inside the Electron that could do with changing? Are there any capacitors i...
by BrettRogersUK
Sun Jul 12, 2020 10:39 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1186
Views: 81909

Re: RGB to HDMI using a Pi Zero and a small CPLD

HI There, I would love to build one of these. I will use it mainly for the BBC Micro and Electron but I do also have a spectrum 48k. I will probably build all 5 or 10 boards (depending on how many I order) and give them to my family who also have a few of the retro machines too. Question 1. I would ...
by BrettRogersUK
Tue Jun 05, 2018 12:42 am
Forum: 8-bit acorn software: classic games
Topic: Mega Games Cartridge for the Electron MGC
Replies: 496
Views: 71518

Re: Mega Games Cartridge for the Electron MGC

Hi there,

I'm interested in one of these. How much are they please? I take it they work on any electron with a plus one adapter or is a plus 3 needed also?

Many Thanks,

Brett Rogers

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