First post, by vstrakh
I've got the A-Trend motherboard that seemingly does not exist. I can't google anything about ATC-1010 version, and even the Wayback Machine's copy of the A-Trend web site does not mention it, jumping over from ATC-1000 straight to ATC-1020.
Looking at the photos on the The Retro Web I see ATC-1020 is very similar to the ATC-1010, with few tiny changes mostly related to making board cheaper - like unpopulated USB and PS/2 connectors or missing flash programming enable/disable jumper. It seems all jumpers carrying the same function are designated identically on both boards, and some are either missing or hardwired on the ATC-1010.
Unfortunately there are some difference that makes me wonder about its nature.
ATC-1010 has the jumper JP18, right under the COAST slot, on the left of the Base_CLK selector table (see pic attached).
I would assume it is related to the cache functionality, but that jumper is not listed in ATC-1020 manuals. The cache upgrade procedure in the ATC-1020 manual tells to disable the onboard TAG chip by removing JP17 that is present on both ATC-1020 and ATC-1010.
The earlier ATC-1000 looks different, it has 3-pin header for tag chip configuration, to select the size of the onboard tag (16k vs 32k) or disable it by removing the jumper.
ATC-1010 has 16k x8 tag chip onboard, and the COAST module I have has 32K x8 tag chip.
I would guess I should just remove JP17 to disable onboard 16k x8 Tag chip, and the chipset would rely on the COAST module's 32k x8 tag chip.
Still, what could be the JP18 function?
The ATC-1020 photo is here: https://theretroweb.com/motherboard/image/atc … 8d085316734.jpg
Interestingly, the DosDays photo of ATC-1020 (http://dosdays.co.uk/topics/images/atrend_atc1020.jpg) looks identical to my ATC-1010 (except the connectors are missing, and the JP5/JP6 are relocated), and it does have the JP18, which unfortunately is not described in the manual linked there.
