Computers Overview
Commodore PET
Sinclair ZX80
Sinclair ZX81
BBC Micro
Sinclair Spectrum
Memotech MTX
    About
    Library
    Manuals
    Options
    Photos
    Projects
      CFX
      Hardware Hacks
      Legacy (1980s)
      MAGROM
      MFX
          Intro
          Design
          Engineering
              Changes
          Firmware
          Orders
          Support
      MTXPlus+
      PAL Reader
      Programmers
      ReMemotech
      ReMemorizer
      SDX
      SFX
    Repairs
    Software
    Tools
    User Groups
    Video Wall
Memotech CP/M
Atari ST
PDAs
DEC 3000 AXP
OpenVMS
Raspberry Pi

 

 
 
 

The Memotech MTX Series

Memotech Multi-Function Expansion System

MFX



 
MFX Boot Screen - VGA



 
MFX Boot Screen - VDP

 one ?)

Orders

MFX is a pretty niche "product" and is only likely to be available in very small quantities, as a result, there isn't a formal method for ordering one. If you would be interested in purchasing one, please drop me an email via the link on the bottom of this page.

 Depending on the availability of the component parts, particularly the FPGA module, I should be able to give you an indication of the current availability and lead time for MFX. Orders will be fulfilled on a first come, first served basis.

On the subject of the FPGA module, availability is not the only issue that I am having. Whilst supplies are becoming more readily available from quite a few of the Chinese resellers, the quality of the boards is very variable, to such an extent that, when I can obtain them, I am seeing failure rates of 25-40%, e.g., from one supplier 1 board in 4 was faulty, from another, 2 from 5.

When faults occur, the core FPGA itself tends to appear to be working and the device can be programmed/verified, but one or more of the I/O ports proves to be faulty. I'd hazard a guess that, even if the fabricator does some testing of the board, they are only checking the device responds and not exercising the I/O. It is also possible that many of these boards are being assembled using factory reject FPGAs.

This has led to a number of symptoms when installed in an MFX, including the complete lack of VGA output, single VGA colour bit(s) missing and failure to detect the SD card. There have been a couple of instances where it has been obvious that poor quality soldering of the TQFP package has been to blame, on other boards, the soldering can appear to be fine and the FPGA apparently has an internal fault with one or more I/O pins.

These details are likely not of interest to many people, but as noted here to give a little background on why the MFX price has turned out to be a little higher than intended.

 

 

M F X   U S E R B A S E

PCB Rev FPGA* FPGA Rev ROM Rev Serial Country Revisions
1.00 EP2C5 1.01 167 MA00 uk (as shipped)
1.00 EP2C5 2.05 240114 13:15 DS01 uk upgraded
1.00 EP2C5 1.01 167 SB02 uk (as shipped)
1.00 EP2C5 2.05 240114 13:15 WB03 uk upgraded
1.00 -- -- -- xx04 --  
1.01 EP2C5 1.00 134 JW05 uk (as shipped)
1.01 EP2C5 1.00 134 SU06 uk (as shipped)
1.01 EP2C5 1.00 134 NB07 jo (as shipped)
1.01 EP2C5 1.00 134 SG08 dk (as shipped)
1.01 EP2C5 1.00 134 MR09 nz (as shipped)
1.01 EP2C5 1.01 167 JW10 nl (as shipped)
1.01 EP2C5 1.01 167 MK11 uk (as shipped)
1.01 EP2C5 1.01 167 JM12 de (as shipped)
1.01 EP2C5 1.01 167 PC13 uk (as shipped)
1.01 EP2C5 1.01 167 NB14 uk (as shipped)
1.01 EP2C5 2.05 240114 13:15 GB15 uk upgraded
1.01 EP2C5 1.01 167 LO16 no (as shipped)
1.01 EP2C5 1.01 167 MR17 uk (as shipped)
1.01 EP2C5 1.01 167 DS18 uk (as shipped)
1.01 EP2C5 2.05 240114 13:15 RE19 uk (as shipped)
1.01 EP2C5 2.05 240114 13:15 MH20 uk (as shipped)
1.01 EP2C5 2.05 240114 13:15 RH21 uk (as shipped)
1.01 EP2C5 2.05 240114 13:15 PV22 uk (as shipped)
1.01 EP2C5 2.05 240114 13:15 KK23 us (as shipped)
1.01 EP2C5 2.05 240114 13:15 KK24 us (as shipped)
1.01 --     JS25 reserved  
1.01 --       available  
1.01 --       available  
1.01 --       available  
1.01 --       available  
1.01 --       available  
1.01 --       available  
1.01 --       available  
1.01 --       available  
1.01 --     RH34 reserved  
             

* EP2C5 Altera Cyclone II EP2C5T144C8N  Logic Elements 4608, RAM 119,808 bits, I/O Pins 81 of 81 used

EP4CE6 Altera Cyclone IV EP4CE6E22C8N Logic Elements 6000, RAM 276,480 bits, I/O Pins 81 of 87 used

 

 

 

mailto: Webmaster

 Terms & Conditions