8 Aug
2014
8 Aug
'14
2:01 p.m.
The KERNAL ROM in my Commodore SX-64 took a dive, and I don't have a spare.
Far as I know it can be replaced with simple 8K PROM/EPROM.
I've got the correct .BIN file - is someone willing to make a kernal ROM
chip for me? If you don't have a suitable chip in your stock, I'm sure I
can turn one up on ebay and have it sent to you.
(And no, it's not the same as the C-64 kernal rom.. close but not
identical.)
TIA for any assistance. Please feel free to mail me off-list.
8 Aug
8 Aug
3:23 p.m.
New subject: RX33 alignment issues?
Just got some RX33 floppies in and noticed that the alignment is off in
all of them. No real problem--I can "unalign" a drive to handle them,
but I'm wondering if this was a common ailment in those drives.
Anyone?
--Chuck
9 Aug
9 Aug
12:20 a.m.
On 8/8/2014 1:01 PM, drlegendre . wrote:
The KERNAL ROM in my Commodore SX-64 took a dive, and
I don't have a spare.
Far as I know it can be replaced with simple 8K PROM/EPROM.
I've got the correct .BIN file - is someone willing to make a kernal ROM
chip for me? If you don't have a suitable chip in your stock, I'm sure I
can turn one up on ebay and have it sent to you.
(And no, it's not the same as the C-64 kernal rom.. close but not
identical.)
TIA for any assistance. Please feel free to mail me off-list.
The KERNAL ROM for
the SX64 is a special one. It uses a 24 pin 2364 ROM
or a 2564 (I think that is the number) 28 pin ROM. Neither are pin
compatible with a 27XX(X) 28 pin EPROM. An adapter needs fashioned
(disclosure, I sell such adapters) for an EPROM, so plan on that. Many
sites show the wiring (GOogle 2364 adapter schematic, or similar)
Not to solicit business per se, but if you're interested in an EPROM and
adapter, I am happy to sell both and burn a copy of the SX64 BIN to it
for you. And, since I'm a greedy capitalistic pig, I can also try to
upsell you on JiffyDOS, which plugs in and speeds up the SX64 immensely
(and comes with the original ROM image as well :-)
Jim
--
Jim Brain
brain at jbrain.com
www.jbrain.com
1:44 a.m.
On 08/08/2014 09:20 PM, Jim Brain wrote:
The KERNAL ROM for the SX64 is a special one. It uses
a 24 pin 2364 ROM
or a 2564 (I think that is the number) 28 pin ROM. Neither are pin
compatible with a 27XX(X) 28 pin EPROM. An adapter needs fashioned
(disclosure, I sell such adapters) for an EPROM, so plan on that. Many
sites show the wiring (GOogle 2364 adapter schematic, or similar)
Can one use a Moto 68764 EPROM without adapters? I've used them for
replacement 5150 ROMs.
--Chuck
2:32 a.m.
On 8/9/2014 12:44 AM, Chuck Guzis wrote:
On 08/08/2014 09:20 PM, Jim Brain wrote:
Yep, if you can both find them and have a unit to program them (I
*think* I have the latter, but not the former).
The KERNAL ROM for the SX64 is a special one. It
uses a 24 pin 2364 ROM
or a 2564 (I think that is the number) 28 pin ROM. Neither are pin
compatible with a 27XX(X) 28 pin EPROM. An adapter needs fashioned
(disclosure, I sell such adapters) for an EPROM, so plan on that. Many
sites show the wiring (GOogle 2364 adapter schematic, or similar)
Can one use a Moto 68764 EPROM without adapters? I've used them for
replacement 5150 ROMs.
--Chuck
--
Jim Brain
brain at jbrain.com
www.jbrain.com
3:04 p.m.
On 08/08/2014 11:32 PM, Jim Brain wrote:
Yep, if you can both find them and have a unit to
program them (I
*think* I have the latter, but not the former).
In the past, I've gotten some from ARBA Electronics in Montreal
(certainly worth an email). I wouldn't be surprised if Anchor in the US
still had a few on hand.
My Superpro and EZ-EP both handle them with no complaints (I haven't
checked my old Sunshine) Other than a very cheap Chinese programmer,
I'd be suprised to find a legacy programmer that didn't use them.
--Chuck
3:14 p.m.
On 08/08/2014 11:32 PM, Jim Brain wrote:
..if you can get them.
It also appears that the Cypress CY7C264 will also work, though I
haven't tried it. eBay has several vendors selling them for about the
same price as a plain-Jane 2764.
I'd stay away from the Chinese vendors, though. You never know what
you'll wind up with.
--Chuck
1:51 a.m.
Thanks for that, sent you a mail, JIm
On Fri, Aug 8, 2014 at 11:20 PM, Jim Brain <brain at jbrain.com> wrote:
On 8/8/2014 1:01 PM, drlegendre . wrote:
The KERNAL ROM in my Commodore SX-64 took a dive,
and I don't have a
spare.
Far as I know it can be replaced with simple 8K PROM/EPROM.
I've got the correct .BIN file - is someone willing to make a kernal ROM
chip for me? If you don't have a suitable chip in your stock, I'm sure I
can turn one up on ebay and have it sent to you.
(And no, it's not the same as the C-64 kernal rom.. close but not
identical.)
TIA for any assistance. Please feel free to mail me off-list.
The KERNAL ROM for the SX64 is a special one. It uses a 24 pin 2364 ROM
or a 2564 (I think that is the number) 28 pin ROM. Neither are pin
compatible with a 27XX(X) 28 pin EPROM. An adapter needs fashioned
(disclosure, I sell such adapters) for an EPROM, so plan on that. Many
sites show the wiring (GOogle 2364 adapter schematic, or similar)
Not to solicit business per se, but if you're interested in an EPROM and
adapter, I am happy to sell both and burn a copy of the SX64 BIN to it for
you. And, since I'm a greedy capitalistic pig, I can also try to upsell
you on JiffyDOS, which plugs in and speeds up the SX64 immensely (and comes
with the original ROM image as well :-)
Jim
--
Jim Brain
brain at jbrain.com
www.jbrain.com
3635
days inactive
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