开云体育

On Thu, Oct 4, 2018 at 02:55 AM, zenith5106 wrote:

On Thu, Oct 4, 2018 at 05:00 AM, lop pol wrote:

It has Mostek MK36694J-5 and MK36693J-5 ROMs. Are these something that in
order to do a proper restore need to be replaced?

IIRC the 468 ROM's came in three revisions, -00, -01 & -02, where
-00 and -01 were Mostek. The -02 had the same digital content as
the -01 but were CY7C264 EPROM's. The Mostek's are unreliable and
for that reason ought to be replaced although replacements could
be hard to find. With an adapter board common 27C64's could be used.

/H?kan

On Friday, 5 October 2018, 18:32:45 GMT+1, lop pol via Groups.Io <the_infinite_penguin@...> wrote:

I emailed the Vintage Tek museum after reading their discussion on the replacement of those ROMs. Hopefully they can program the EPROMs and sell them to me. If not it looks like I'll need an EPROM programmer. The order for all of the main capacitors has been placed so there is no turning back now. Thanks for the input.


On Thu, Oct? 4, 2018 at 02:55 AM, zenith5106 wrote:

On Thu, Oct? 4, 2018 at 05:00 AM, lop pol wrote:

It has Mostek MK36694J-5 and MK36693J-5 ROMs. Are these something that in
order to do a proper restore need to be replaced?

IIRC the 468 ROM's came in three revisions, -00, -01 & -02, where
-00 and -01 were Mostek. The -02 had the same digital content as
the -01 but were CY7C264 EPROM's. The Mostek's are unreliable and
for that reason ought to be replaced although replacements could
be hard to find. With an adapter board common 27C64's could be used.

/H?kan