Printed Amstrad Addict magazine announced, check it out here!
Started by Chinnery, 10:02, 27 May 19
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Quote from: schombi on 06:53, 09 January 22My skills in soldering a fairly poor and I have no background in electronics, but I successfully managed to build me a working Batman the Movie cartridge. Thanks for sharing this project!What I´m still struggling with: I was always under the impression that the ACID chip was always required to use a cartridge on the GX4000 and those chips are hard to get these days. How come this project lets you decide whether to run with or without the ACID chip?
Quote from: Shining on 09:55, 05 January 22Quote from: TotO on 16:58, 03 December 21I have tested this schematic by curiosity, and it looks to not work at all. May be I have done something wrong... I don't understand what does special your RC combination compared to the original schematic.Perhaps my schematic was not clear, cause I missed to describe the signal on the RC-combination:On the original oscillogram for acid reset (https://www.cpcwiki.eu/index.php/File:ACID_Init_by_Grim.png) you will notice that after startup the sin signal has to be high. Using the original schematic from nilquader, the sin signal after reset is 50% low or high cause it does not follow the reset at all. Now instead of pulling the RC to VCC, I used the CCLR signal not only for CLK+ but also for PRE at the flip flop to force the flipflop to "1" after reset. Also I lowered the time constant for the RC-combination.I know quite some plusses where this always works and noone reported a single problem until now.
Quote from: TotO on 16:58, 03 December 21I have tested this schematic by curiosity, and it looks to not work at all. May be I have done something wrong... I don't understand what does special your RC combination compared to the original schematic.
hi i'm trying to make this cartridge work without the chip acidbut without modifications it does not start on my cpc 464 plus what should I modify on the card that I did print?do i have to do some sanding?I am sure that the eprom written by me work because if I put the chip acid they start without problemscan someone just tell me the modicum to do?
Quote from: bobmoo79 on 12:25, 30 June 22So is this the correct interpretation of what 'Shining' posted? I've connect the top of the R1 to CCLR and CLK (R1 is no longer connected to VCC). I've changed C2 to 100pF.
Quote from: bobmoo79 on 12:25, 30 June 22Initially I tried a 74HC112 flipflop but read somewhere that it should be a 74AC112 as the other is too slow
Quote from: eto on 10:02, 05 January 23Quote from: bobmoo79 on 12:25, 30 June 22So is this the correct interpretation of what 'Shining' posted? I've connect the top of the R1 to CCLR and CLK (R1 is no longer connected to VCC). I've changed C2 to 100pF.Did you ever get that to work? I want to implement the same design but I'm not sure if it's correct or not. Quote from: bobmoo79 on 12:25, 30 June 22Initially I tried a 74HC112 flipflop but read somewhere that it should be a 74AC112 as the other is too slowCan someone confirm that the 74AC112 is required? Or should the 74HC112 always do? Or: in which cases is the 74HC112 not sufficient? I have a cartridge here with a HC112 and it seems to work.
Quote from: bobmoo79 on 13:08, 05 January 23so would be interested to know if you get yours working (and how).
Quote from: eto on 12:41, 06 January 23En mi diseño actual, agregaré cierta flexibilidad, por lo que se puede usar una sola PCB para Eproms de 1 Mbit a 8 Mbit y también ofreceré la opción de agregar interruptores DIP para seleccionar diferentes imágenes ROM, si un Eprom contiene más de una sola imagen ROM. Básicamente, puede usarlo para cualquier cosa, desde imágenes ROM de 64 KB a 512 KB y Eproms de 1 Mbit a 8 Mbit. Mi caso de uso personal es tener un solo cartucho System para mi Plus que contenga todo lo que pueda necesitar, pero por supuesto, también puede usarlo como un cartucho multijuego.Por cierto: para este caso de uso, acabo de leer ayer en Facebook que un multicartucho está disponible nuevamente. Es casi el doble de grande que un cartucho normal, pero también puede contener dos Eprom de 8 Mbit, lo que le da acceso, por ejemplo, a 16 juegos (originales): https://github.com/zeus074/Amstrad_Multicart?fbclid=IwAR1Y5acw2JXlD7Lj_-oVmmmFXKxp1TZOorqEduaN-04Ssz4G5vX5jw_AjnA Hello, does this design allow 74HC112 or is an original chip necessary? Can you share PCB file? Thanks!
Quote from: Duca750 on 18:54, 08 January 23Hello, does this design allow 74HC112 or is an original chip necessary?
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