The Single-Board 6502

Eric Rehnke

TIPS FROM READERS

From Christopher J. Flynn (2601 Claxton Dr., Herndon, VA 22070)…

KIMSI fans, if they don't already know, should get a copy of Forethought's application note A15. It describes the use of the popular EXPANDORAM dynamic memory board in the KIMSI. A two chip refresh controller is added to the KIMSI breadboard area. The refresh controller causes the 6502 to wait when refresh is needed thus slowing things down a little. I have had the EXPANDORAM running for two or three months now with no problems. It's a very good way to get a lot of RAM for a moderate price without requiring a huge power supply.

From Sam Sturgis, (86 Fisher St., Medway, MA 02053)…

Micro-Ade Assembler users can fix a bug in version 1.0 by changing location $2AF9 from $49 to $48. This will allow use of the symbolic argument modifiers /, +, and - with the define byte ( = ) psuedo instruction. Without this change, the modifiers are ignored by the assembler, making it extremely difficult (if not impossible) to construct symbolic tables.

From an anonymous reader…

AIM users who would like to have darker print from the printer can parallel R21 with an additional 4.7K resistor. I'm not sure how this affects the life of the printhead, but I'm sure Rockwell wouldn't approve of this mod.