[Coco] Some details on CoCo 1 ROM burning

[Charles Hudson]

Done and done; the EMP-20 used the 1A module, set the proper voltage
and programmed the EPROM - ECB first, as suggested and then CB1.4. 
Slower than the USB programmers I have been using but much more
flexible.  My new favorite.  Next to fix the keyboard.

Thanks for your help.
-CH-



On Sat, 2021-12-18 at 15:06 -0600, Dave Philipsen wrote:
> If I were you I'd burn the ECB ROM first, verify that everything
> works, 
> then upgrade the CB ROM. I have the Needham's SA-20 and it's a
> reliable 
> unit that I've used for many years. You might verify that the EMP-20 
> will specifically do the 68766 EPROMs since they have a slightly
> changed 
> pinout and higher programming voltage than most of the 27 series of
> EPROMs.
> 
> 
> 
> On 12/18/2021 1:05 PM, Charles Hudson wrote:
> > Well, my screenshot bounced but the gist of it is: binary.
> > 
> > On 12/18/2021 12:41 PM, Dave Philipsen wrote:
> > > I’m not sure what format the files you acquired are (probably
> > > binary) 
> > > but you can verify by trying to open them with a text editor.
> > > Intel 
> > > Hex usually have lines that start with a colon and a hex number
> > > (i.e. 
> > > :20). Intel S records usually have lines that start with ‘S1’ 
> > > followed by some hex numbers. Binary files will just show up as a
> > > bunch of garbage in a text editor.
> > > 
> > > As far as programming the EPROMs, yes, a starting address of 0000
> > > and 
> > > the hardware will decode it to the proper address in the 6809
> > > memory 
> > > map.
> > > 
> > > 
> > > > On Dec 18, 2021, at 6:37 AM, Charles Hudson
> > > > <charles484 at twc.com> wrote:
> > > > 
> > > > As described earlier I have a CoCo 1 which came with Color
> > > > Basic 
> > > > 1..1 in ROM and I am interested in fitting a TCDD controller
> > > > and 
> > > > drive to the system.  Accordingly I need to upgrade the ROMs
> > > > and add 
> > > > Extended Color Basic.
> > > > 
> > > > I have obtained MCM68766C35 EPROMs, blanked them, obtained a 
> > > > Needham's EMP-20 programmer and the DOS software, verified the 
> > > > parallel port operation of the EMP-20 with a '586 VLB machine
> > > > and 
> > > > downloaded the CoCo ROM images from Tandy Color Computer
> > > > Archive. I 
> > > > plan to use at least CB 1.2 and ECB 11.  I know the ECB ROM
> > > > goes in 
> > > > the higher-numbered IC slot, left if facing from the front.
> > > > 
> > > > Now I come to actually programming the EPROMs and two questions
> > > > occur to me:  Which format are these ROM images? Binary, Intel
> > > > hex 
> > > > and Motorola S hex are possibilities (among others); I would
> > > > assume 
> > > > Motorola hex format for these.  And should I load each ROM
> > > > image 
> > > > with a 00 starting address in the ROM and let the hardware sort
> > > > out 
> > > > the addressing?
> > > > 
> > > > Just checking...  Thanks for your replies.
> > > > 
> > > > -CH-
> > > > 
> > > > 
> > > > -- 
> > > > Coco mailing list
> > > > Coco at maltedmedia.com
> > > > https://pairlist5.pair.net/mailman/listinfo/coco
> > > 
> > 
> 
> 
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