Re: Copying ROMS ?

Yes, I said I did a hard reset. Control @ and entered the new
time,etc and pressed ENTER and verified that all my programs were
gone.

But, even with no BASIC ROMs in the HX-20, it still gives me the
BASIC and Monitor options AND I can select either one. I even
entered a BASIC program and executed it (all without the BASIC ROMs
installed)

Wierd!

> When you did the reset, did you do ALL of the reset? I take it you
> pressed the reset button, but then to reinitialize the memory you have
> to press "control @" while in the menu. You then enter time and date
> and all RAM gets wiped and ROM reloaded.
>
>
> Mike Davis wrote:
> >
> > Nope! No manufacturers mark. Only the numbers given beow and a date
> > code like A27 119.
> >
> > But like I said, I have two HX-20. One has the BASIC ROMs, the
> > other has 27C64 EPROMs. I just can't read the BASIC ROMs into my
> > Data I/O PROM Programmer. Not sure of family/pin code. I have
> > tried all of the 8K codes, with no luck.
> >
> > I also tried swapping them (not sway :-) but there appears to be
> > something else at play here that I'm not familar with. When I pull
> > all of the BASIC ROMs, the system still runs BASIC (with no ROMs at
> > all). Only way I can see this is if there was some code pulled from
> > ROM and resident in the HX-20. Epson did this with the PX-8 but
> > there is no mention in the manual and I can't force a reload.
> >
> > I'm asking some HX-20 experts but have not heard back yet.
> >
> > > Is there a manufacturers mark on these ROMs? Is it possible they
> > > are Motorola? Motorola had some ideas about Eprom/Rom
> > > compatibility that wasn't shared by Intel and others and
> > > Motorolas' design did not catch on. Motorola was (it seems) more
> > > aligned with TI in those days (both from Texas?) and were also
> > > making 2564's that have a different select pinout than 2764s. Do
> > > the 2764 Eproms work in the board that has these mystery ROMs?
> > >
> > > On another note, I hope it isn't too hot where you are - you
> > > mention swaying the ROMs and I'd hate to think you were succumbing
> > > to the weather... ;-) Heatstroke? (going back into hiding...)
> > >
> > > John:-#)#
> > >
> > > At 08:12 AM 22/06/2002 -0700, Mike Davis wrote:
> > >
> > >
> > > >Like I said below:
> > > >EPSON BASIC1R0 M64020AA
> > > >EPSON BASIC1R0 M64021AA
> > > >EPSON BASIC1R0 M64022AA
> > > >EPSON BASIC1R0 M64023AA
> > > >
> > > >The other writing is simply date code information.
> > > >
> > > >The thing is, like I have said, I have a 2nd HX-20 that has
> > > >27C64s installed. So, I was going to copy the BASIC to 27c64s
> > > >and use in the 2nd unit to have a BASIC machine.
> > > >
> > > >Someone suggested that the masked ROMs might have some sort of
> > > >special non-standard select method within the ROMs. But if that
> > > >was the case, the 27C64 wouldn't work, unless there was some
> > > >difference in the board (No PALs on this board). I'm going to
> > > >disassemble it today and see if the 2nd unit has some rewired
> > > >ROMs.
> > > >
> > > >But, I have a 2nd problem that I'm trying to work off of this
> > > >board. I pulled the BASIC ROMs from the 1st unit and performed a
> > > >hard reset, clearing RAM. Still ran BASIC and the monitor
> > > >program that were supposed to be in ROM (ROMs were completely out
> > > >of the system).
> > > >
> > > >I was going to simply sway ROMS and see if they worked in the
> > > >other system but for some reason, the systems behave the same,
> > > >regardless of which set of ROMs is in either machine.
> > > >
> > > >I thought perhaps the program is loaded into resident memory but
> > > >the manuals don't mention this and I don't know how to force a
> > > >reload. I know their other machine, PX-8, behaved this way.
> > > >
> > > >
> > > > > Is there any common numbering on the masked parts that might
> > > > > give a clue as to what they REALLY are?
> > > > >
> > > > >
> > > > > Mike Davis wrote:
> > > > > >
> > > > > > That was the first thing I tried. It read in all blank.
> > > > > > That is the problem that I'm trying to resolve.
> > > > > >
> > > > > > > If 2764s are known to work just read the ROMs as 2764s.
> > > > > > >
> > > > > > >
> > > > > > > Mike Davis wrote:
> > > > > > > >
> > > > > > > > I have verified that I can read and write other 27c64s
> > > > > > > > and I also tried swapping ROMS however there is another
> > > > > > > > small glitch.
> > > > > > > >
> > > > > > > > Apparently the HX-20 runs the programs out of RAM. I
> > > > > > > > guess it loads from PROM and runs from RAM. I removed
> > > > > > > > all of the BASIC ROMs and performed a hard reset and
> > > > > > > > when it comes back, it's still running BASIC, without
> > > > > > > > the BASIC ROMs even installed. Wierd!
> > > > > > > >
> > > > > > > > I have looked through the manuals to try and find a way
> > > > > > > > to force a reload but no go (so far). I might try
> > > > > > > > removing the internal batteries and see what happens.
> > > > > > > >
> > > > > > > > The manual also mentions that one can use 27C64s in the
> > > > > > > > HX-20. There may also be one other thing that is causing
> > > > > > > > the problem. I am trying to read the ROMS using
> > > > > > > > family/pin codes for other ROMS. I don't find that part
> > > > > > > > number and have tried a number of other 8K ROM fam/pin
> > > > > > > > codes and none give me anything but blank loads.
> > > > > > > >
> > > > > > > > Perhaps that is part of the problem?
> > > > > > > >
> > > > > > > > Mike
> > > > > > > >
> > > > > > > > >
> > > > > > > > > Verify that you can read another 2764 (incase you have
> > > > > > > > > reader problems).
> > > > > > > > >
> > > > > > > > > Can you swap the 2764 for the Masked ROMs & work
> > > > > > > > > without changing jumpers/settings/wiring?
> > > > > > > > >
> > > > > > > > > I see there are a few HX-20 collectors on the net,
> > > > > > > > > they may be more informed.
> > > > > > > > >
> > > > > > > > > Kev
> > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > I think I understand what you are saying. I'm sure
> > > > > > > > > > they are Masked ROMS or at least that would make
> > > > > > > > > > sense. They are a 4 chip chipset with numbers:
> > > > > > > > > > EPSON BASIC1R0 M64020AA to M65023AA.
> > > > > > > > > >
> > > > > > > > > > The thing is however, that in identical machines,
> > > > > > > > > > the other EPROMS are 27C64 so the pinout would seem
> > > > > > > > > > to have to be the same or the EPROMS would not work
> > > > > > > > > > right in the other identical machines, would they?
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > >
> > > > > > >
> > > > >
> > > > >
> > >
>
>
Received on Sat Jun 22 11:41:41 2002