I didn't know that a 1541 uses 2716s ??
Can you read the STs and verify correctly?
Sometimes the Chinese programmers have a marginal Vpp supply and maybe the STs
need a little more current; if the programmer has provision for an external
power supply I'd try that.
m
----- Original Message -----
From: Josh Bensadon
To: torontocbm@xxxxxxxxxxxxx
Sent: Monday, February 12, 2018 9:12 AM
Subject: [torontocbm] Re: (no subject)
I took a look at the data sheets, VOH and VOL are the same, so they should
work just fine, but perhaps you have a slow EPROM?
Check the speed of each eprom, should be in the full part number, typically
they put a dash at the end with the speed, like -45 for 450nS. The ST data
sheet says -1 is the 350ns version. Check it
------------------------------------------------------------------------------
From: torontocbm-bounce@xxxxxxxxxxxxx <torontocbm-bounce@xxxxxxxxxxxxx> on
behalf of zsimonz <dmarc-noreply@xxxxxxxxxxxxx>
Sent: Monday, February 12, 2018 7:23 AM
To: torontocbm@xxxxxxxxxxxxx
Subject: [torontocbm] Re: (no subject)
I bought a universal rom programmer from China and it works well reading the
old chips from c64 oand others . I know the Motorola mcm2716 eprom works on the
old c64 and 1541 drives etc. So I I purchased the st 2716 eproms as well since
the data sheets match I thought . I tried burning some roms and it didn't seem
to work .
Does anybody know if the mcm2716 is compatible with the st 2716 ?
Is there any eproms that someone can recommend that are current day
equivalent ?
Thanks
-------- Original message --------
From: Duke Nukem <dukenukem@xxxxxxxxxxxxxx>
Date: 02-11-2018 11:42 PM (GMT-05:00)
To: torontocbm@xxxxxxxxxxxxx
Subject: [torontocbm] Re: (no subject)
I'm right by the Etobicoke/Mississauga border in the GTA.
-Mark.
Sent: Sunday, February 11, 2018 at 10:04 PM
From: "Mike Stein" <mhs.stein@xxxxxxxxx>
To: torontocbm@xxxxxxxxxxxxx
Subject: [torontocbm] Re: (no subject)
Where in North America?
----- Original Message -----
From: Duke Nukem
To: Toronto CBM
Sent: Friday, February 09, 2018 1:27 AM
Subject: (no subject)
I posted this on Lemon 64 but I think TPUG members may be able to provide a
better answer since many users are here in Canada so MUST have some Members
that have had to solve the same issue below:
Okay, I broke down and decided to buy an EPROM Burner and it'll take a
little time to ship of course). Now, I want mainly to burn Kernal ROMs for my
1541C's which drive knock every time I turn them on for starters. Also have a
dead Char. ROM or 2 etc. So aside from fixing those and tinkering with making
some Carts I also want to play with making a few PLAs using the AT27C512R-45
chip so what do you recommend cause I've found some listings:
1) 10pcs/lot M27C256B-10F1 M27C256B 27C256 DIP-28 IC
2) 10PCS M27C128-10F1 27C128
3) AM27C256-150D AM27C256 27C256
Just to list a few but obviously these seem to ALL be sourced from China
and I've read stories where ppl swear they're recycled parts.
Any links and/or recommendations would GREATLY be welcome especially given
the above applications I have for my future EPROM Burner. Especially source and
Brand.
Just keep in mind I'm in North America.
Thanks.
-Mark.
