[Coco] Some details on CoCo 1 ROM burning

[Charles Hudson]

I have a couple of USB programmers and I shortly discovered that the 
68776 was not in the supported list.  Consulting the datasheet I found 
out why; that led to trying to find the EMP-20.  I soon realized the 
ROMs were going to cost me more than the CoCo.

On 12/18/2021 4:06 PM, 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
>>>
>>
>
>