[Coco] Some details on CoCo 1 ROM burning

[Dave Philipsen]

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
>>
>


-- 
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus