That's true, I noticed the black, burn ring, but I am not worried about it as it is on MIC line. I want to make sure all 48K of RAM are in working order before going to fix other smaller issues.
Search found 35 matches
- Wed Jul 20, 2022 11:55 am
- Forum: Hardware
- Topic: Spectrum 48K Issue 2 - "RAM 0 FAIL"
- Replies: 9
- Views: 3241
- Tue Jul 19, 2022 12:34 pm
- Forum: Hardware
- Topic: Spectrum 48K Issue 2 - "RAM 0 FAIL"
- Replies: 9
- Views: 3241
Re: Spectrum 48K Issue 2 - "RAM 0 FAIL"
Thanks, Mark. [...] By the way, which ULA version do you have in this board? Sinclair discovered that the original design was marginal on the DRAM timings, hence in later boards, the timing for the “lower” DRAM was changed slightly. Mark The ULA version is 5C112E-3 I think (see the picture below). h...
- Mon Jul 18, 2022 10:53 am
- Forum: Hardware
- Topic: Spectrum 48K Issue 2 - "RAM 0 FAIL"
- Replies: 9
- Views: 3241
Re: Spectrum 48K Issue 2 - "RAM 0 FAIL"
The version I'm using is not the latest (0.37), but one below (0.36D). I run the Soak Test as explained on the GitHub page: If the 'S' key is held down when the machine is powered on, the firmware enters soak test mode (signified by a third high pitched tone immediately after the initialisation tone...
- Sun Jul 17, 2022 8:07 pm
- Forum: Hardware
- Topic: Spectrum 48K Issue 2 - "RAM 0 FAIL"
- Replies: 9
- Views: 3241
Re: Spectrum 48K Issue 2 - "RAM 0 FAIL"
Thanks, Mark. In my previous message, I have incorrectly assumed that RAM 0 FAIL refers to the first RAM chip of the lower RAM., whereas there is no "zero" in the error message. I followed your instructions and disabled the upper RAM. Now, when using the Retroleum DiagROM, I consistently get the exp...
- Sun Jul 17, 2022 3:29 pm
- Forum: Hardware
- Topic: Spectrum 48K Issue 2 - "RAM 0 FAIL"
- Replies: 9
- Views: 3241
Spectrum 48K Issue 2 - "RAM 0 FAIL"
Hello, I am testing a Spectrum 48K Issue 2 using the " ZX External ROM " sold by MyRetroStore. The ROM is loaded with four diagnostic tools, two of them being "Retroleum DiagROM v1.56" and "Brendan Alford Diagnostics 0.36D". Before removing IC25 and IC26, Retroleum DiagROM was reporting IC25 and IC2...
- Sat Jun 04, 2022 8:27 am
- Forum: WANTED
- Topic: EPROM Programming Service
- Replies: 4
- Views: 6582
Re: EPROM Programming Service
Thanks for the link. I have contacted them - I will post here when I get any feedback.Lardo Boffin wrote: ↑Thu Jun 02, 2022 6:53 pm I have had ZX81 ROMs done here:
https://www.mutant-caterpillar.co.uk/shop/
- Thu Jun 02, 2022 6:39 pm
- Forum: WANTED
- Topic: EPROM Programming Service
- Replies: 4
- Views: 6582
EPROM Programming Service
I don't have a programmer suitable for programming 27128 EPROMs. Is anyone out there offering this kind of services? I have two such chips and I would like to have them "burnt", one with a Spectrum 48K ROM and another one with a Spectrum 48K clone ROM.
- Sat May 21, 2022 10:41 am
- Forum: Software
- Topic: ROM Image Editor
- Replies: 4
- Views: 7700
Re: ROM Image Editor
Many thanks for your feedback. @Paul, I don't have the TL866CS; I was looking to get one, until I discovered that, with help from some adapters , I can use my Retro Chip Tester as an EPROM programmer. I don't know yet how viable this solution is and how well it works, but I will find out soon enough...
- Fri May 20, 2022 10:02 pm
- Forum: Software
- Topic: ROM Image Editor
- Replies: 4
- Views: 7700
ROM Image Editor
Hello,
I need to write the ZX Spectrum 48K ROM into four 2732 EPROM's (Mitsubishi M5L2732K). I assume I need to find a "way" to split the 16384 bytes "48k.rom" file into four files of 4096 bytes each. What Windows / Linux / macOS program shall I use to achieve this?
I need to write the ZX Spectrum 48K ROM into four 2732 EPROM's (Mitsubishi M5L2732K). I assume I need to find a "way" to split the 16384 bytes "48k.rom" file into four files of 4096 bytes each. What Windows / Linux / macOS program shall I use to achieve this?
- Thu Feb 24, 2022 8:18 pm
- Forum: Hardware
- Topic: Harlequin Rev G: just lines 🙏🏻
- Replies: 2
- Views: 1317
Re: Harlequin Rev G: just lines 🙏🏻
Hello, my first post here so hopefully somebody will help a newbie. I just assembled a Rev G 48k Harlequin after my spectrum sadly died. I burned a 27C256 using my TL866CS. But alas upon startup all i get is this.. could it be rom-related? Any leads to the possible culprit?IMG_6115.MP4 Did you burn...