EPROM bits reorganizer 1.05

van snout op 10-02-2005, 13:53
Onderwerp: Software
Labels: Utilities
Talen:

Marcos Daniel, developer of Final Copy has just released a new tool called EPROM bits reorganizer 1.05. This program can be used to decode and, more important, encode EPROM data from EPROM devices with modified data-wires, such as the ROM of the MegaRAMdisk in the Brazilian DDX. In ordinary EPROM recoders, reading these EPROMs would result in incomprehensible code, making it nearly impossible to replace the internal software.

Relevant link: EPROM bits reorganizer 1.05

Reacties (7)

Van snout

Ascended (15184)

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10-02-2005, 13:54

I'm not really an EPROM specialist, so I hope I didn't say something utterly stupid in this newspost ^_^

Van BiFi

Enlighted (4348)

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10-02-2005, 13:59

and otherwise there's probably some EPROM for dummies tutorial for you to read somewhere on the net Wink

Van adrcunha

Expert (117)

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10-02-2005, 22:02

You post it right, snout. Just your example is a bit wrong: such as the ROM of the MegaRAMDisk (a MegaRAM+RAMDisk from a Brazilian company called DDX).
BTW, due to an upcoming project of mine I also made a tool like this one, but for Windows platform. It can be downloaded from http://www.msxpro.com/pc.html (check for "CodEprom").

Van snout

Ascended (15184)

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10-02-2005, 22:08

Thx for the extra explanation, Adriano... changed it to 'MegaRAMdisk' Wink

Van NYYRIKKI

Enlighted (5873)

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11-02-2005, 14:05

Somehow I feel, that "making it nearly impossible to replace the internal software" is a bit over reacting... If you are skillfull enough to replace internal software, this should not be probem. Here is program, that does the same thing on MSX:


; D = Bits (= EPROM data-wires) to be swapped (BIT 3 & BIT 5)
; HL = From (#8000)
; BC = Lenght (#4000)

	LD D,%00101000
	LD HL,#8000
	LD BC,#4000

LOOP:
	LD A,D
	AND (HL)
	JP Z,NOSWAP
	CP D
	JP Z,NOSWAP
	LD A,(HL)
	XOR D
	LD (HL),A
NOSWAP:
	INC HL
	DEC BC
	LD A,B
	OR C
	JP NZ,LOOP
	RET

Van NYYRIKKI

Enlighted (5873)

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11-02-2005, 14:20

Ah, it was for MSX, sorry... No readme?

Van atom

Supporter (16)

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12-02-2005, 01:07

I needed a utility like this two years ago! when building Carchano's CIEL Disk Interface when I noticed that the pinout of its EPROM was ALL a mess! This is so in way to simplify the electronic circuit board. To solve this I used a NVRAM ( BQ4011 / DS1230 ) instead of EPROM 27C256, writing the ROM with the MSX.
I thought to make to myself an program to adapt and not use an rewritable IC, but I decided the hardware solution, more expensive, the only drawback is NVRAM internal battery life, about 10 years maybe more....

Dante