Amstrad 464plus Upgrade: Part 2
24I have almost all the parts required - it isn't recommended to use ceramic or MLCCs in place of the original polyester capacitors, so I need to order these as well as the large inductor. I also need to decide whether I'll utilise the internal floppy interface (default A:) or the external floppy interface (default B:).
I can also compare my 464plus board with a 6128plus board - my 464plus board is an MC0122D and 6128plus board is an MC0122C (earlier revision?).
So in this video I install all the ICs and resistors:
IC3 ... SED9420C data separator
IC4 ... Z0765A08PSC FDC
IC5/IC6 ... 74LS38 quad 2-input NAND
IC7 ... 74HC14 hex inverting Schmitt trigger (must be HC-type apparently)
R6 ... 820KΩ
R7/R12 ... 2.2kΩ
R8 ... 1.5KΩ
R9 ... 33KΩ
R10 ... 82KΩ
R11 ... 6.8KΩ
R29 ... 10KΩ (already fitted in mine)
NR01 ... 6 x 680Ω network
C4 ... 100nF ceramic
C39 ... 470µF electrolytic
Remaining parts are:
L04 ... 125µH 2A filter inductor (have ordered Wurth Elektronik part 744114)
C3/C20/C23 ... 10nF 50V polyester (0.01µF or 10000pF)
C21 ... 47nF 50V polyester (0.047µF or 47000pF)
C22 ... 1nF 50V polyester (0.001µF or 1000pF)
Plus however I'm going to interface the floppy (well, likely a Gotek) drive.
A good summary of the upgrades is here:
https://www.cpcwiki.eu/index.php?title=464Plus_Conversion&oldid=105769
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