Don Thomasson About Roles Name : Don Thomasson Book Role Advanced Spectrum FORTH Author FORTH per Spectrum Author Ins and Outs of the TIMEX TS1000 & ZX81, The Author Change Request You can request changes or additions here. You can upload files. All change requests are actioned as quickly as possible and you will be informed of the result. Details Files Your Name * Email * Details Your browser doesn't have Flash, Silverlight or HTML5 support. Submit Thank you for your change request. We will respond as soon as possible.